identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
03C3AC5D0D1A4847ECF4FC7D29E8940F.text	03C3AC5D0D1A4847ECF4FC7D29E8940F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) brevirostris Koenike 1895	<div><p>1. Sperchon (Sperchon) brevirostris Koenike, 1895</p><p>Distribution: European part: Kola Peninsula (Sokolow, 1940; Shubina &amp; Tsember, 2017); Komi Republic (Shubina &amp; Tsember, 2017).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1A4847ECF4FC7D29E8940F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1A4847ECF4FBE92ACC94F7.text	03C3AC5D0D1A4847ECF4FBE92ACC94F7.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) fluviatilis Uchida 1934	<div><p>2. Sperchon (Sperchon) fluviatilis Uchida, 1934</p><p>Distribution: Far East: Sakhalin (Uchida, 1936b).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1A4847ECF4FBE92ACC94F7	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1A4847ECF4FB21294496CF.text	03C3AC5D0D1A4847ECF4FB21294496CF.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) glandulosus Koenike 1886	<div><p>3. Sperchon (Sperchon) glandulosus Koenike, 1886</p><p>Distribution: European part: Leningrad region (Sokolow, 1936; Sokolow &amp; Jankovskaja, 1962); Kola Peninsula (Sokolow, 1940; Shubina &amp; Tsember, 2017), Moscow region (Jankovskaja, 1964); Komi Republic (Shubina &amp; Tsember, 2017); Caucasus: North Ossetia (Sokolow, 1927), Krasnodar region (Sokolow, 1940); Western Siberia: Altai region (Zhukova &amp; Bezmaternykh, 2008; Stolbov, 2008); Khanty-Mansi Autonomous Okrug (Stolbov, 2024); Yamalo-Nenets Autonomous Okrug (Stolbov et al., 2025); Eastern Siberia: Irkutsk region, Republic of Buryatia, Zabaykalsky region (Semenchenko &amp; Matafonov, 2014); Sakha Republic (Semenchenko et al., 2010); Far East: Khabarovsk Krai (Sokolow, 1950); Primorsky Krai, Sakhalin (Sokolow, 1940); Chukotka Peninsula (Wainstein, 1976b); Magadan Region, Kamchatka (Wainstein, 1981a); Jewish Autonomous Oblast (Semenchenko, 2005); Amur Region (Semenchenko, 2010).</p><p>Notes. 1) A number of old references may probably refer to Sperchon thienemanni Koenike, 1907, which was previously considered a variety of this species. 2) Sperchon glandulosus cubanicus Sokolow, 1940 occurs in the same samples as the nominative subspecies and requires re-examination, since its taxonomic status is not sufficiently defined.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1A4847ECF4FB21294496CF	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1A4847ECF4F9292B6896B7.text	03C3AC5D0D1A4847ECF4F9292B6896B7.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) kuluensis Tuzovskij 1990	<div><p>4. Sperchon (Sperchon) kuluensis Tuzovskij, 1990</p><p>Distribution: Far East: Magadan region (Tuzovskij, 2008).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1A4847ECF4F9292B6896B7	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1A4847ECF4F9602A6D978B.text	03C3AC5D0D1A4847ECF4F9602A6D978B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) kurilensis Uchida 1936	<div><p>5. Sperchon (Sperchon) kurilensis Uchida, 1936</p><p>Distribution: Far East: Kuril Islands (Uchida, 1936a).</p><p>Note: The species was originally assigned to the subgenus Hispidosperchon . However, the description of this species does not indicate the presence of a reticulated structure of the integument (the main feature of Hispidosperchon). Accodring to the description of Uchida, the integument has fine ridges. So very likely, this species belongs to Sperchon s.s. Also, it is impossible to determine the sex of the material from the description, which makes its identification difficult.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1A4847ECF4F9602A6D978B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FF1D2BD890AF.text	03C3AC5D0D1B4846ECF4FF1D2BD890AF.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) laurenticus Wainstein 1981	<div><p>6. Sperchon (Sperchon) laurenticus Wainstein, 1981</p><p>Distribution: Western Siberia: Yamalo-Nenets Autonomous Okrug (Stepanov, 2006; Stolbov e t al., 2025); Far East: Chukotka (Wainstein, 1981a, b); Amur Region (Semenchenko, 2010).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FF1D2BD890AF	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FE892AAD9133.text	03C3AC5D0D1B4846ECF4FE892AAD9133.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) minutiporus Sokolow 1934	<div><p>7. Sperchon (Sperchon) minutiporus Sokolow, 1934</p><p>Distribution: European part: Komi Republic (Shubina &amp; Tsember, 2017); Far East: Primorsky Krai, Khabarovsk Krai (Sokolow, 1940; Semenchenko, 2008a).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FE892AAD9133	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FE512B39924F.text	03C3AC5D0D1B4846ECF4FE512B39924F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) monodentatus Tuzovskij 1981	<div><p>9. Sperchon (Sperchon) monodentatus Tuzovskij, 1981</p><p>Distribution: Far East: Chukotka (Tuzovskij, 1981)</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FE512B39924F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FEE52A289187.text	03C3AC5D0D1B4846ECF4FEE52A289187.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) monticolus Wainstein 1981	<div><p>8. Sperchon (Sperchon) monticolus Wainstein, 1981</p><p>Distribution: Eastern Siberia: Sakha Republic (Semenchenko et al., 2010); Far East: Magadan Region, Kamchatka (Wainstein, 1981a, b).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FEE52A289187	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FDA92BF092D3.text	03C3AC5D0D1B4846ECF4FDA92BF092D3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) orientalis Tuzovskij 1990	<div><p>10. Sperchon (Sperchon) orientalis Tuzovskij, 1990</p><p>Distribution: Eastern Siberia: Sakha Republic (Semenchenko et al., 2010); Far East: Magadan Region, Chukotka, Kamchatka (Tuzovskij, 2008), lower Amur basin (Semenchenko, 2008a).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FDA92BF092D3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FD052C63929B.text	03C3AC5D0D1B4846ECF4FD052C63929B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) pesici Tuzovskij 2021	<div><p>11. Sperchon (Sperchon) pesici Tuzovskij 2021</p><p>Distribution: Far East: Chukotka, Magadan region, Kamchatka (Tuzovskij, 2021).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FD052C63929B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FD5D2CD29343.text	03C3AC5D0D1B4846ECF4FD5D2CD29343.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) prosperoides Tuzovskij 1990	<div><p>12. Sperchon (Sperchon) prosperoides Tuzovskij, 1990</p><p>Distribution: Far East: Magadan region (Tuzovskij, 2008); Amur region (Semenchenko, 2010).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FD5D2CD29343	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FC952D31930B.text	03C3AC5D0D1B4846ECF4FC952D31930B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) prosperus Wainstein 1981	<div><p>13. Sperchon (Sperchon) prosperus Wainstein, 1981</p><p>Distribution: Far East: Chukotka (Wainstein, 1981a, b); Khabarovsk Krai (Semenchenko, 2008c).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FC952D31930B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FCED2D6293F3.text	03C3AC5D0D1B4846ECF4FCED2D6293F3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) questor Wainstein 1981	<div><p>14. Sperchon (Sperchon) questor Wainstein, 1981</p><p>Distribution: Far East: Magadan region (Wainstein, 1981a, b); lower Amur basin (Semenchenko, 2008a).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FCED2D6293F3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FC2428DD9447.text	03C3AC5D0D1B4846ECF4FC2428DD9447.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) resupinus Viets 1922	<div><p>15. Sperchon (Sperchon) resupinus Viets, 1922</p><p>Distribution: European part: Moscow (Sokolow, 1940); Kola Peninsula, Komi Republic (Shubina &amp; Tsember, 2017).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FC2428DD9447	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FB4529B29567.text	03C3AC5D0D1B4846ECF4FB4529B29567.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) similis Wainstein 1981	<div><p>17. Sperchon (Sperchon) similis Wainstein, 1981</p><p>Distribution: Western Siberia: Khanty-Mansi Autonomous Okrug (Stolbov, 2024); Far East: Chukotka (Wainstein, 1981a, b).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FB4529B29567	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FB9128DD9493.text	03C3AC5D0D1B4846ECF4FB9128DD9493.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) squamosus Kramer 1879	<div><p>16. Sperchon (Sperchon) squamosus Kramer, 1879</p><p>Distribution: European part: Leningrad region (Sokolow, 1925; 1936), Karelian Isthmus (Sokolow &amp; Jankovskaja, 1962); Komi Republic (Shubina &amp; Tsember, 2017); Sverdlovsk region (Stolbov et al., 2024); Western Siberia: Khanty-Mansi Autonomous Okrug (Stolbov, 2024); Yamalo-Nenets Autonomous Okrug (Stolbov et al., 2025).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FB9128DD9493	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FAB12B43952F.text	03C3AC5D0D1B4846ECF4FAB12B43952F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) termalis Wainstein 1981	<div><p>18. Sperchon (Sperchon) termalis Wainstein, 1981</p><p>Distribution: Far East: Magadan region (Wainstein, 1981a, b).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FAB12B43952F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4FA092D5D965F.text	03C3AC5D0D1B4846ECF4FA092D5D965F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) thienemanni Koenike 1907	<div><p>19. Sperchon (Sperchon) thienemanni Koenike, 1907</p><p>Syn.: Sperchon rugosus Koenike, 1911</p><p>Distribution: European part: Leningrad region (Sokolow, 1936); Komi Republic (Shubina &amp; Tsember, 2017).</p><p>Note: Previously considered a form of S. glandulosus, so some older references may refer to this species.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4FA092D5D965F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4F9992B7996EB.text	03C3AC5D0D1B4846ECF4F9992B7996EB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) tridentatus Sokolow 1940	<div><p>20. Sperchon (Sperchon) tridentatus Sokolow, 1940</p><p>Distribution: European part: Komi Republic (Tuzovskij, 2006; Shubina &amp; Tsember, 2017); Western Siberia: Khanty-Mansi Autonomous Okrug (Stolbov, 2024); Altai Republic (Sokolow, 1940); Eastern Siberia: Sakha Republic (Semenchenko et al., 2010); Far East: Chukotka, Kamchatka, Wrangel Island (Wainstein, 1981a); Khabarovsk Krai (Semenchenko, 2008a); Amur Region (Semenchenko, 2010).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4F9992B7996EB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4F94D2DB09753.text	03C3AC5D0D1B4846ECF4F94D2DB09753.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) turgidus Viets 1914	<div><p>21. Sperchon (Sperchon) turgidus Viets, 1914</p><p>Distribution: European part: Leningrad region (Sokolow, 1936); Komi Republic (Shubina &amp; Tsember, 2017).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4F94D2DB09753	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4F8852A569727.text	03C3AC5D0D1B4846ECF4F8852A569727.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) uralensis Kolesnikov & Stolbov 2025	<div><p>22. Sperchon (Sperchon) uralensis sp. nov.</p><p>Distribution: Western Siberia: Khanty-Mansi Autonomous Okrug.</p><p>Note: The description is given below.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4F8852A569727	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1B4846ECF4F8F12B7197EF.text	03C3AC5D0D1B4846ECF4F8F12B7197EF.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) ussuriensis Tuzovskij 2002	<div><p>23. Sperchon (Sperchon) ussuriensis Tuzovskij, 2002</p><p>Distribution: Far East: Primorsky Krai (Tuzovskij, 2002).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1B4846ECF4F8F12B7197EF	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4FE022A569554.text	03C3AC5D0D1C4841ECF4FE022A569554.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) clupeifer Piersig 1896	<div><p>25. Sperchon (Hispidosperchon) clupeifer Piersig, 1896</p><p>Syn.: Sperchon elegans Thor, 1898; Sperchon thori Koenike, 1901; Sperchon koenikei Walter, 1907; Sperchon undulosus Koenike, 1908 .</p><p>Distribution: European part: Republic of Karelia (Sokolow, 1930), Kola Peninsula (Sokolow, 1940; Shubina &amp; Tsember, 2017), Leningrad Region (Sokolow, 1936); Tver Region (Thor, 1923; Sokolow, 1940); Kaluga Region (Jankovskaja, 1964); Yaroslavl Region (Zhavoronkova, 2000; Tuzovskij, 1977; 1996; Zhavoronkova et al., 2023); Samara Region (Tuzovskij, 2007); Voronezh Region (Silina et al., 2014); Komi Republic, Arkhangelsk Region (Shubina &amp; Tsember, 2017); Sverdlovsk Region (Klimov et al., 2022; Stolbov et al., 2024): Caucasus: Krasnodar Krai (Jankovskaja, 1959); Western Siberia: Tyumen Region (Stolbov, 2010)</p><p>Note: Wainstein (1981) suggested that S. clupeifer may have three subspecies: the nominate one, S. clupeifer plumifer Thor, 1902 and S. clupeifer anulatus Wainstein, 1981 . He saw differences between these subspecies only in the presence of a chitinous plate around the excretory pore and the degree of plumoseness of the dorsal setae of the legs and their frequency. Since the presence or absence of a chitinous plate around the excretory pore is a species characteristic (Di Sabatino et al. 2010), it is impossible to agree with the subspecific status of S. plumifer (now recognized as a junior synonym of Sperchon hispidus Koenike, 1895). Sperchon clupeifer and S. hispidus are quite clearly distinguished by this feature, as well as by the length/height ratio of P-4 and by the shape of the dorsal shields in the male (Di Sabatino et al. 2010). The degree of plumoseness of the dorsal setae of the legs also differs, but not always obviously (Di Sabatino et al. 2010). The third subspecies S. clupeifer anulatus also should it be considered a probably full species to the difference from S. clupeifer in the sclerotization of the excretory pore. In the density of the plumose dorsal setae of the legs and sclerotization of the excretory pore, it is closer to S. hispidus . But it differs from it in the degree of plumoseness of these setae. Moreover, it differs from the two species in the proportions of P-4 - it is narrower in S. clupeifer anulatus (~8.0) vs. S. hispidus (4.5 – 5.4) vs. S. clupeifer (5.4 – 6.5). Thus, S. clupeifer anulatus can probably be recognized as a separate species, but the lack of information on males does not provide complete certainty. A re-examination of the type material of S. clupeifer anulatus is required and more material is needed, including males.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4FE022A569554	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4FA862BC6951C.text	03C3AC5D0D1C4841ECF4FA862BC6951C.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) compactilis Koenike 1911	<div><p>26. Sperchon (Hispidosperchon) compactilis Koenike, 1911</p><p>Distribution: European part: Komi Republic (Shubina &amp; Tsember, 2017).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4FA862BC6951C	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4FADE29BE95A8.text	03C3AC5D0D1C4841ECF4FADE29BE95A8.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) denticulatus Koenike 1895	<div><p>27. Sperchon (Hispidosperchon) denticulatus Koenike, 1895</p><p>Distribution: European part: Komi Republic, Kola Peninsula (Shubina &amp; Tsember, 2017).</p><p>Note: According to current data, it belongs to a complex of closely related species, reliably distinguishable only by males (Di Sabatino et al. 2010). Therefore, we are not sure that the identification of Shubina &amp; Tsember (2017) refers to this species.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4FADE29BE95A8	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4F9822B2F96E4.text	03C3AC5D0D1C4841ECF4F9822B2F96E4.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) hispidus Koenike 1895	<div><p>28. Sperchon (Hispidosperchon) hispidus Koenike, 1895</p><p>Syn.: Sperchon plumifer Thor, 1902</p><p>Distribution: European part: Kola Peninsula (Shadin, 1940); Arkhangelsk region, Komi Republic (Shubina &amp; Tsember, 2017); Sverdlovsk region (Klimov et al., 2022; Stolbov et al., 2024); Caucasus: North Ossetia (Sokolow, 1927); Far East: Primorsky Krai (Semenchenko, 2008b).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4F9822B2F96E4	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4F9362C4796AC.text	03C3AC5D0D1C4841ECF4F9362C4796AC.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) levanidovae Wainstein 1981	<div><p>29. Sperchon (Hispidosperchon) levanidovae Wainstein, 1981</p><p>Distribution: Far East: Chukotka, Kamchatka, Wrangel Island (Wainstein, 1981a, b).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4F9362C4796AC	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4F88E2C1D9714.text	03C3AC5D0D1C4841ECF4F88E2C1D9714.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) nevelskoii Tuzovskij & Semenchenko 2009	<div><p>30. Sperchon (Hispidosperchon) nevelskoii Tuzovskij &amp; Semenchenko, 2009</p><p>Distribution: Far East: Khabarovsk Krai (Tuzovskij &amp; Semenchenko, 2009).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4F88E2C1D9714	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4F8C62B5097A0.text	03C3AC5D0D1C4841ECF4F8C62B5097A0.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) papillosus Thor 1901	<div><p>31. Sperchon (Hispidosperchon) papillosus Thor, 1901</p><p>Syn.: Sperchon compactilis discrepans Viets, 1919</p><p>Distribution: European part: Leningrad region (Sokolow, 1936); Kola Peninsula (Sokolow, 1940; Shubina &amp; Tsember, 2017); Tver region (Thor, 1923); Kaluga region (Jankovskaja, 1964); Samara region (Tuzovskij, 2007); Arkhangelsk region, Komi Republic (Shubina &amp; Tsember, 2017)</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4F8C62B5097A0	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1C4841ECF4FF1D2A5690AF.text	03C3AC5D0D1C4841ECF4FF1D2A5690AF.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) zhavoronkovae Kolesnikov & Stolbov 2025	<div><p>24. Sperchon (Sperchon) zhavoronkovae sp. nov.</p><p>Distribution: Western Siberia: Khanty-Mansi Autonomous Okrug.</p><p>Note: The description is given below.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1C4841ECF4FF1D2A5690AF	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1D4840ECF4FF1D28DD914B.text	03C3AC5D0D1D4840ECF4FF1D28DD914B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) setiger Thor 1898	<div><p>32. Sperchon (Hispidosperchon) setiger Thor, 1898</p><p>Distribution: European part: Leningrad region (Sokolow, 1936); Lipetsk region (Silina, 2015); Yaroslavl region (this study); Komi Republic (Shubina &amp; Tsember, 2017); Western Siberia: Sverdlovsk region (Klimov et al., 2022).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1D4840ECF4FF1D28DD914B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1D4840ECF4FE3D2A16926B.text	03C3AC5D0D1D4840ECF4FE3D2A16926B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Palpisperchon) crassipalpis Marshall 1933	<div><p>33. Sperchon (Palpisperchon) crassipalpis Marshall, 1933</p><p>Distribution: European part: Komi Republic (Tuzovskij, 2013); Eastern Siberia: Irkutsk region (Tuzovskij, 2013); Far East: Kamchatka (Wainstein, 1976 a, 1981a), Magadan region, Primorsky Krai (Wainstein, 1981a); lower Amur basin (Semenchenko, 2008a).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1D4840ECF4FE3D2A16926B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1D4840ECF4FDCD2C8C929B.text	03C3AC5D0D1D4840ECF4FDCD2C8C929B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Palpisperchon) distans (Scheffler 1972)	<div><p>34. Sperchon (Palpisperchon) distans (Scheffler, 1972)</p><p>Distribution: European part: Komi Republic (Shubina &amp; Tsember, 2017); Sverdlovsk region (Stolbov et al., 2024); Western Siberia: Khanty-Mansi Autonomous Okrug (Stolbov, 2024); Eastern Siberia: Irkutsk region (Scheffler, 1972); Far East: Chukotka (Wainstein, 1981a); Amur region (Semenchenko, 2010)</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1D4840ECF4FDCD2C8C929B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1D4840ECF4FD5C29D1936F.text	03C3AC5D0D1D4840ECF4FD5C29D1936F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Palpisperchon) scopetsi Tuzovskij 1982	<div><p>35. Sperchon (Palpisperchon) scopetsi Tuzovskij, 1982</p><p>Distribution: Far East: Magadan Region (Tuzovskij, 1982); Khabarovsk Territory (Semenchenko, 2008c), Amur Region (Semenchenko, 2010).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1D4840ECF4FD5C29D1936F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1D4842ECF4FCF52C809186.text	03C3AC5D0D1D4842ECF4FCF52C809186.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) zhavoronkovae Kolesnikov & Stolbov 2025	<div><p>Sperchon (Sperchon) zhavoronkovae sp. nov.</p><p>(Figs 2–4, 11A,B)</p><p>Material examined. Holotype: female, Russia, Nether-polar Urals, Khanty-Mansi Autonomous Okrug, Beryozovsky district, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=59.680725&amp;materialsCitation.latitude=64.568306" title="Search Plazi for locations around (long 59.680725/lat 64.568306)">Shaitanka River</a>, 64°34'05.9"N 59°40'50.6"E, 407 m a.s.l., among moss on stones, 25.07.2023, leg. V. Stolbov (Fig. 1A).</p><p>Diagnosis. Integument dorsally with flat papillae separated by short folds, ventrally with undulating folds. Glandularia platelets of dorsum not enlarged, without muscle attachment platelets (except Dl-2). Cx-I+II not fused, Cx-III with a small medial glandular opening. Venter without muscle attachment platelets.Acetabula 1 and 2 rounded, the small, distance between these acetabula is 1 – 2 times greater than their length. Excretory pore surrounded bу а sclerotized ring, located distinctly closer to Vgl-3. P-2 not shortened or widened, with a pointed distoventral projection and two distal short setae and one long spiniform basal seta. P-3 without ventral setae. Ventral peg-like seta on P-4 small, far distanced rom each other. P-5 twice as long as it is wide. IV-L-3 – 5 with few slightly serrated dorsal setae.</p><p>Description</p><p>Female. Integument dorsally with flat, papillae separated by short folds, which are located predominantly in the transverse direction of the idiosoma; ventrally with undulating fine folds, which are located predominantly in the transverse direction of the idiosoma. Dorsoglandularia and lateroglandularia are located on medium-sized (diameter 80 – 100) chitinous platelets with irregular shaped edges. Seta Dgl-1 slightly spiniform, short, smooth. Preocularia setae are located on small chitinous platelets (diameter 35), postocularia—larger (diameter 90, approximately the same diameter as the ocular plate). Frontale pore (Fr) present. Dorsocentralia muscle attachment plates (Dc) absent, only one pair small (25) dorsolateralia plates Dl-2 present. Five pairs of lyriform organs (i 1-5) present. Cx-I+II medially close to each other and in close contact, but not fused. Cx-III with a small medial glandular opening (Cxgl-4). Coxoglandulare plates 2 (Cxgl-2) and lateroglandularia 3 (Lgl-3) medium-sized (70), ventroglandularia 1 (Vgl-1) small (35), other ventroglandularia platelets (Vgl-2-4) larger (80-90). Excretory pore surrounded bу а sclerotized ring (103), located distinctly closer to Vgl-3 than to Vgl-1. Genital plates not enlarged (225) with 17 – 18 medial and 6 – 7 lateral setae. Acetabula 1 and 2 (Ac-1-2) rounded, small (35 – 40), distance between Ac-1 and Ac-2 is 1 – 2 times greater than their length. Acetabulum 3 round, larger (47). Postgenital and ventral sclerites (Vc) absent.</p><p>Gnathosoma with rostrum shorter than gnathosomal base. Palp: P-1 with one small spiniform dorsal setae; P-2 not shortened or widened, with nine spiniform dorsal setae, a pointed distoventral projection with two distal short setae and one long (longer than distoventral projection) spiniform basal seta; P-3 with five spiniform and two short filiform dorsal setae, ventral margin without setae and denticulation; P-4 longer than P-3, narrow (length/height 6.2), with two slightly developed ventral tubercles, bearing peg-like setae (proximal seta slightly larger that distal), proximal tubercle larger than distal one, proximal peg-like seta is located almost in the middle of P-4, the distal one is closer to the distal margin of P-4 (length of P-5 approximately equal to distance from distal ventral peg-like seta on P-4 to distal edge of P-4), the distance between peg-like setae is more than twice as long as the height of P-4, between peg-like setae two short filiform setae, distal spine seta pointed, slightly widened towards the top; P-5 twice as long as wide, with large distal spines, two approximately the same size as ventral spines, one small dorsal spines before solenidion, one bifurcated seta (branches are equivalent) and four filiform setae (distance between bases of distal and ventral filiform setae very short than length of ventral setae).</p><p>Leg segments slender, IV-L-3-5 with few slightly serrated dorsal setae, other setae spiniform or short filiform. Ambulacrum with claw blade well protruding bearing a long dorsal and a shorter ventral clawlet.</p><p>Male unknown.</p><p>Measurements. Idiosoma L 1430, W 1100; distance between anterior end of Cx-I and posterior end of Cx-IV, 627; Cx-III W, 790. Palp dL/H ratio: P-1 52/58, 0.89; P-2 153/111, 1.37; P-3 176/100, 1.76; P-4 270/44, 6.1; P-5 44/22, 2.0. Gnathosoma L 298; chelicera L 285. Leg segments dL: I-L-2–6: 136, 175, 267, 283, 231; IV-L: 154, 201, 191, 405, 382, 317.</p><p>Etymology. The species is named after of the late Dr. Olga D. Zhavoronkova for her contributions to the study of water mites.</p><p>Remarks. The new species is most similar to Sperchon fluviatilis in the following characters: integument with undulating fine ridges; ventral setae P-3 absent; ventral spiniform seta P-2 present; distance between bases of distal and ventral filiform setae very short than length of ventral setae. However, the new species is noticeably different from S. fluviatilis by the following characters: length of P-5 approximately equal to distance from distal ventral peg-like seta on P-4 to distal edge of P-4 (vs. length of P-5 shorter than distance from distal ventral peg-like seta on P-4 to distal edge of P- 4 in S. fluviatilis); acetabula not large, distance between Ac-1 and Ac-2 is 1-2 times greater than their length (vs. acetabula large, distance between Ac-1 and Ac-2 is 1/2 times less than their length in S. fluviatilis); folds of skin covers on back and behind genital opening are arranged in transverse rows (vs. arranged in irregular rows in S. fluviatilis); anus with sclerotized plate (vs. without sclerotized plate in S. fluviatilis).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1D4842ECF4FCF52C809186	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D1F4849ECF4F9EF2A0791FB.text	03C3AC5D0D1F4849ECF4F9EF2A0791FB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Sperchon) uralensis Kolesnikov & Stolbov 2025	<div><p>Sperchon (Sperchon) uralensis sp. nov.</p><p>(Figs 5–7, 11C,D)</p><p>Material examined. Holotype: male, Russia, Nether-polar Urals, Khanty-Mansi Autonomous Okrug, Beryozovsky district, Kobyla-Yu <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=59.55633&amp;materialsCitation.latitude=64.50669" title="Search Plazi for locations around (long 59.55633/lat 64.50669)">River</a>, 64°30'24.1"N 59°33'22.8"E, 571 m a.s.l., 23.07.2023, leg. V. Stolbov (Fig. 1B).</p><p>Diagnosis. Integument dorsally with numerous long folds, between which are located few rounded or elongated papillae, ventrally with undulating fine folds. Glandularia platelets of dorsum not enlarged, with small muscle attachment platelets (Dc-2-4 and Dl-1-4), Dl-1 consosting of two small platelets, Dl-2 consisting of three small platelets. Cx-I+II not fused, Cx-III with a small medial glandular opening. Ventral with muscle attachment platelets present. Acetabula 1 and 2 elongated, distance between these acetabula is one times greater than their length. Excretory pore surrounded bу а sclerotized ring, located distinctly closer to Vgl-3 than to Vgl-1. P-2 not shortened or widened, with a pointed distoventral projection with three distal short setae and one short spiniform basal seta. P-3 without ventral setae. Ventral peg-like seta on P-4 very small, far apart. P-5 more than twice as long as wide. Few dorsal setae of IV-L-3-5 not plumose.</p><p>Description</p><p>Male. Integument dorsally with numerous long folds, between which are located rare rounded or elongated papillae; ventrally with undulating fine folds. Dorsoglandularia and lateroglandularia are located on small (diameter 55-70) chitinous platelets with irregular shaped edges. Seta Dgl-1 slightly spiniform, very short, smooth. Preocularia are located on small chitinous platelets (diameter 30), postocularia—larger (diameter 82-90, approximately the same diameter as the ocular plate). Frontale pore (Fr) present. Dorsocentralia and dorsolateralia muscle attachment plates (Dc-2-4 and Dl-1-4) present, Dc-3 larger (110-125/60-70) than others (20-50), elongated with a constriction in the middle, Dl-1 consisting of two small platelts, Dl-2 consisting of three small platelets. Five pairs lyriform organs (i 1-5) present. Cx-I+II medially close to each other and in close contact, but not fused. Cx-III with a small medial glandular opening (Cxgl-4). Coxoglandularia platelets 2 (Cxgl-2), lateroglandularia 3 (Lgl-3) and ventroglandularia 2 and 3 (Vgl-2-3) platelets small (40-50), ventroglandularia 1 (Vgl-1) a little smaller (30). Ventralia muscle attachment plates (V-1-3) present, small (20-30). Excretory pore surrounded bу а sclerotized ring (60), located distinctly closer to Vgl-3 than to Vgl-1. Genital plates not enlarged (251) with 14 medial and 5 lateral setae. Acetabula 1 and 2 (Ac-1-2) slightly elongated, small (55-65/30), distance between Ac-1 and Ac-2 is one times greater than their length. Acetabulum 3 round, larger (50). Postgenital platelet present (50). Pregenetal platelets small (25).</p><p>Gnathosoma with rostrum shorter than gnathosomal base. Palp: P-1 with one small spiniform dorsal setae; P-2 not shortened or widened, with 12 spiniform dorsal setae, a pointed distoventral projection with three distal short setae and one short (not longer than distoventral projection) spiniform basal seta; P-3 with three spiniform and two short filiform dorsal setae, ventral margin without setae and denticulation; P-4 longer than P-3, narrow (length/ height 6.3), with two slightly developed ventral tubercles, bearing minute peg-like setae, proximal tubercle slightly larger than distal one, proximal peg-like seta is located slightly distal to middle of P-4, distal one is closer to the distal margin of P-4 (length of P-5 noticeably longer than distance from distal ventral peg-like seta on P-4 to distal edge of P-4), the distance between peg-like setae is twice as long as the height of P-4, between peg-like setae two minute filiform setae, distal spine seta rounded at top; P-5 more than twice as long as wide, with large distal spines, two ventral spines of approximately the same size, one small dorsal spines before solenidion, one bifurcated seta (branches are equivalent) and four filiform setae (distance between bases of distal and ventral filiform setae slightly larger than length of ventral setae).</p><p>Leg segments slender, IV-L-3-5 with few thin dorsal setae, not plumose, other setae spiniform or short filiform. Ambulacrum with claw blade well protruding bearing a long dorsal and a shorter ventral clawlet.</p><p>Female unknown.</p><p>Measurements. Idiosoma L 1270, W 1010; distance between anterior end of Cx-I and posterior end of Cx-IV, 590; Cx-III W, 832. Palp dL/H ratio: P-1 40/64, 0.62; P-2 153/117, 1.3; P-3 189/99, 1.9; P-4 313/50, 6.3; P-5 77/26, 2.9. Gnathosoma L 276; chelicera L 290. Leg segments dL: I-L-2–6: 128, 191, 325, 351, 299; IV-L: 160, 177, 208, 390, 385, 320.</p><p>Etymology. The species is named after the Ural Mountains where it was found.</p><p>Remarks. The new species is most similar to Sperchon questor in the following characters: integument with papillae and undulating fine folds; acetabula Ac-1 and Ac-2 slightly elongated; ventral setae P-3 absent; ventral spiniform seta P-2 present; length of P-5 is noticeably less than distance from distal ventral peg-like seta on P-4 to distal edge of P-4; distance between bases of distal and ventral filiform setae longer than length of ventral setae. However, the new species is noticeably different from S. questor by the following characters: P-4 not longer than P-2+3 (vs. P-4 longer than P-2+ 3 in S. questor); ventrodistal process on P-2 with 3 setae, not bifurcated (vs. ventrodistal process on P-2 with two setae, clearly bifurcated in S. questor); dorsal integument with few papillae (vs. papillae numerous in S. questor).</p></div>	https://treatment.plazi.org/id/03C3AC5D0D1F4849ECF4F9EF2A0791FB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D144849ECF4FE792DB39327.text	03C3AC5D0D144849ECF4FE792DB39327.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon (Hispidosperchon) setiger Thor 1898	<div><p>Sperchon (Hispidosperchon) setiger Thor, 1898</p><p>(Figs 8– 10, 11E,F)</p><p>Material examined. Three females, Russia, Yaroslavl region, Kutma River, 24.11.2024, leg. V. Kolesnikov ; one female, Russia, Sverdlovsk Region, Balda River, 04.10.2020, leg. V. Stolbov (COX1 sequence: OL343041) .</p><p>Diagnosis. Integument reticulated, with numerous folds. Glandularia platelets of dorsum not enlarged, dorsum with small muscle attachment plates (Dc-2-4 and Dl-1-4). Cx-I+II separated, Cx-III without glandular opening, Cxgl-4 is the only seta between Cx-IV and genital plates. Venter with muscle attachment platelets. Acetabula 1 and 2 elongated, close to each other. Excretory pore without sclerotized ring, located close to Vgl-3. P-2 not shortened or widened, with a pointed distoventral projection with three distal short setae, ventral spiniform seta absent. P-3 with four spiniform ventral setae. Ventral peg-like seta on P-4 small. P-5 short. IV-L-3-5 with few, simple dorsal setae.</p></div>	https://treatment.plazi.org/id/03C3AC5D0D144849ECF4FE792DB39327	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
03C3AC5D0D084854ECF4FE3D2BB197B8.text	03C3AC5D0D084854ECF4FE3D2BB197B8.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sperchon Kramer 1877	<div><p>Key to species of the Sperchon from Russia</p><p>1 P-4 with two greatly enlarged ventral peg-like setae, close to each other ( Palpisperchon Lundblad, 1941).............. 26</p><p>– P-4 with two small ventral peg-like setae................................................................... 2</p><p>2 Integument rugose or papillate ( Sperchon s. str.)............................................................. 3</p><p>– Integument reticulated (at least in localized areas) ( Hispidosperchon Thor, 1901).................................. 28</p><p>3 Claws of leg with 3 teeth; P-4 shorter than P-3.............................................................. 4</p><p>– Claws of leg with 2 teeth; P-4 longer than P-3............................................................... 5</p><p>4 Integument with muscle attachment sclerites; P-2 with 2 setae; P-3 is stockier, maximum height near middle of segment; leg claws with three unequal clawlets, lamella ventral margin concave......................... Sperchon (Sperchon) pesici</p><p>– Integument without muscle attachment sclerites; P-2 with 3 setae; P-3 more slender, maximum height in proximal quarter; leg claws with three subequal clawlets, lamella ventral margin straight..................... Sperchon (Sperchon) tridentatus</p><p>5 Acetabula small, rounded, distance between Ac-1 and Ac-2 is more than 3 times longer than the length of each acetabulum. 6</p><p>– Acetabula larger, rounded or elongated, distance between Ac-1 and Ac-2 is no more than 3 times longer than the length of each acetabulum.......................................................................................... 9</p><p>6 P-3 with setae on ventral side............................................................................ 7</p><p>– P-3 without setae on ventral side......................................................................... 8</p><p>7 Integument with large tubercles into which cuticular folds flow; P-2 with short conical ventrodistal process; P-4 with ventral peg-like setae of different size - distal seta is noticeably smaller than proxima setal; P-5 with 3 filiform setae (except bifurcated seta); length of genital plates female 285, male—265................................. Sperchon (Sperchon) prosperus</p><p>– Integument with small tubercles and ribs, without folds; P-2 with long conical ventrodistal process; P-5 with 4 filiform setae (except bifurcated seta); length of genital plates female 250–270, male—195–230........ Sperchon (Sperchon) prosperoides</p><p>8 P-5 short, length is approximately equal to its width; rostrum longer................... Sperchon (Sperchon) minutiporus</p><p>– P-5 longer, twice as long as it is wide; rostrum shorter............................... Sperchon (Sperchon) laurenticus</p><p>9 Acetabula Ac-1 and Ac-2 slightly elongated, not more than two times longer than their width........................ 10</p><p>– Acetabula Ac-1 and Ac-2 noticeably elongated, their length is more than two times longer than their width............. 16</p><p>10 Base of ventrodistal process on P-2 without spine-like seta.................... Sperchon (Hispidosperchon) kurilensis *</p><p>– Base of ventrodistal process on P-2 with 1 spine-like seta.................................................... 11</p><p>11 P-4 with one ventral peg-like seta............................................. Sperchon (Sperchon) monodentatus</p><p>– P-4 with two ventral peg-like setae...................................................................... 12</p><p>12 Length of P-5 longer than distance from distal ventral peg-like seta on P-4 to distal margin of P-4; distance between bases of distal and ventral filiform setae exceeds length of ventral setae................................................ 13</p><p>– Length of P-5 shorter than or approximately equal to distance from distal ventral peg-like seta on P-4 to distal margin of P-4; distance between bases of distal and ventral filiform setae shorter than length of ventral setae........................ 15</p><p>13 Integument with numerous rounded papillae connected to each other by short skin folds; ventral filiform seta on P-5 short. 14</p><p>– Integument with linear wavy folds, without rounded papillae; ventral filiform seta on P-5 of medium length............................................................................................ Sperchon (Sperchon) similis</p><p>14 P-4 longer than P-2+3; ventrodistal process on P-2 with 2 setae, clearly bifurcated........... Sperchon (Sperchon) questor</p><p>– P-4 not longer than P-2+3; ventrodistal process on P-2 with 3 setae, not bifurcated... Sperchon (Sperchon) uralensis sp. nov.</p><p>15 Length of P-5 shorter than distance of distal ventral peg-like seta on P-4 to distal margin of P-4; acetabula large, distance between Ac-1 and Ac-2 is 1/2 times less than their length; ridges of integument on dorsum and posterior to genital field are arranged in irregular rows; excretory pore without sclerotized ring...................... Sperchon (Sperchon) fluviatilis</p><p>– Length of P-5 approximately equal to distance of distal ventral peg-like seta on P-4 to distal edge of P-4; acetabula smaller, distance between Ac-1 and Ac-2 is 1-2 times greater than their length; ridges of idosoma covers on dosrum and posterior to genital opening are arranged in transverse rows; ecxretory pore with sclerotized ring................................................................................................ Sperchon (Sperchon) zhavoronkovae sp. nov.</p><p>16 Base of ventrodistal extension on P-2 with 2 spine-like setae, tip of ventrodistal extension with 1 seta............................................................................... Sperchon (Sperchon) monticolus Wainstein, 1981</p><p>– Base of ventrodistal extyension on P-2 with 1 spine-like seta or without spine-like seta, tip of ventrodistal process with 2-3 seta............................................................................................... 17</p><p>17 Base of ventrodistal process on P-2 without spine-like seta................................................... 18</p><p>– Base of ventrodistal process on P-2 with 1 spine-like seta.................................................... 20</p><p>18 Ventrodistal extension on P-2 long; P-2 and P-3 not shortened or widened; ventral peg-like setae on P-4 not close to each other, directed ventrally............................................................ Sperchon (Sperchon) squamosus</p><p>– Ventrodistal extension on P-2 short; P-2 and P-3 are greatly shortened and widened; ventral peg-like setae on P-4 closer to each other, directed proximally.............................................................................. 19</p><p>19 Р-2 higher than long, its distoventral projection narrow, finger-shaped; Р-4 distoventral peg-like seta located medially, closer to proximoventral peg seta than to distal segment margin................................. Sperchon (Sperchon) turgidus</p><p>– Р-2 as long as high, its distoventral projection short, forming а broad-based triangle; Р-4 distoventral peg-like seta located ventrally, closer to distal segment margin than to proximoventral peg seta................. Sperchon (Sperchon) resupinus</p><p>20 Ventrodistal extension on P-2 short, ventral spine seta longer that its length...................................... 21</p><p>– Ventrodistal extension on P-2 long, ventral spine seta not longer that its length.................................... 22</p><p>21 P-5 twice as long as wide, medial seta is located almost at same level as bifurcated seta; ventral peg-like setae on P-4 pointed, proximal peg-like seta situated near middle of ventral row P-4......................... Sperchon (Sperchon) ussuriensis</p><p>– P-5 2.5 times longer than wide, medial seta distinctly posterior to bifurcated seta; ventral peg-like setae on P-4 with flat tip, proximal peg-like seta does not reach 1/2 middle of ventral row P-4..................... Sperchon (Sperchon) kuluensis</p><p>22 Cx-I medially fused, completely surrounding gnathosomal base; ventral peg-like setae on P-4 very small; P-4 longer than P-2+3....................................................................... Sperchon (Sperchon) brevirostris</p><p>– Cx-I medially separated bу а fine strip of membranous integument; ventral peg-like setae on P-4 of normal size; P-4 not longer than P-2+3......................................................................................... 23</p><p>23 Plate with postocular seta greater than ocular capsule............................... Sperchon (Sperchon) glandulosus</p><p>– Plate with postocular seta smaller than ocular capsule....................................................... 24</p><p>24 Anus surrounded bу а sclerotized ring................................................................... 25</p><p>– Anus without sclerotized ring................................................. Sperchon (Sperchon) thienemanni</p><p>25 Seta Dgl-1 longer than diameter its chitinous plate; P-1 without seta; 17-19 medial genital setae in female; dorsal and ventral setae on tibia IV are indistinguishable from each other….............................. Sperchon (Sperchon) orientalis</p><p>– Seta Dgl-1 shorter than diameter its chitinous plate; P-1 with seta; 12 medial genital setae in female; dorsal setae on tibia IV slightly thinner and longer than ventral setae......................................... Sperchon (Sperchon) termalis</p><p>26 Integument with small papillae; ventral extension on P-3 is weakly expressed; acetabula Ac-1 and Ac-2 are elongated, their length is greater than distance between the acetabula........................... Sperchon (Palpisperchon) crassipalpis</p><p>– Integument fine lined or with strips and ribs; ventral protrusion on P-3 is distinct; acetabula Ac-1 and Ac-2 are rounded, their length is clearly less than distance between the acetabula..................................................... 27</p><p>27 Integument fine-lined; Cx-II and Cx-III close together, the distance less than their width; ventral peg-like seta on P-4 not expanded or slightly expanded at tip, not rhomboid................................ Sperchon (Palpisperchon) distans</p><p>– Integument with strips and ribs; Cx-II and Cx-III not close together, distance is greater than their width; ventral peg-like seta on P-4 weakly expanded at tip, rhomboid....................................... Sperchon (Palpisperchon) scopetsi</p><p>28 Well developed sexual dimorphism: mаles раlр stout, with inflated Р-2 and Р-3 distal margins forming strongly developed sheaths flanking base of subsequent segments, female раlр slender, ventral margin of Р-3 covered bу fine denticulation.......................................................... Sperchon (Hispidosperchon) denticulatus species group**</p><p>– Poorly developed sexual dimorphism, in both sexes, palp neither inflated, nor with а denticulate ventral margin of Р-3.... 29</p><p>29 Сх-III with а glandularium near medial margin............................................................. 30</p><p>– Сх-III without a glandularium near medial margin.......................................................... 33</p><p>30 Distance between Ac-1 and Ac-2 is shorter than their length.................................................. 31</p><p>– Distance between Ac-1 and Ac-2 is longer or approximately equal to their length… Sperchon (Hispidosperchon) levanidovae</p><p>31 Excretory pore located closer to Vgl-1 than to Vgl-3; male with 2 large dorsal shields. Sperchon (Hispidosperchon) nevelskoii</p><p>– xcretory pore located closer to Vgl-3 than to Vgl-1; male with 1 large dorsal shield or with several isolated plates........ 32</p><p>32 Excretory pore surrounded bу а sclerotized ring; IV-leg with densely plumose dorsal setae (&gt; 6); in both sexes, dorsum with several isolated platelets................................................ Sperchon (Hispidosperchon) hispidus ***</p><p>– Excretory pore without sclerotized ring; IV-leg with less plumose dorsal setae (&lt;6); males with а dorsal shield, females with several isolated plates.................................................... Sperchon (Hyspidosperchon) clupeifer</p><p>33 Р-3 without ventral setae............................................... Sperchon (Hispidosperchon) compactilis</p><p>– Р-3 with ventral setae................................................................................. 34</p><p>34 Р-3 with up to 2 ventral setae; integument sculpture made up of а network of fine denticles combined with additional larger papillae.............................................................. Sperchon (Hispidosperchon) papillosus</p><p>– Р-3 with four, rarely three ventral setae; integument sculpture formed exclusively bу fine denticles............... Sperchon (Hispidosperchon) setiger</p><p>Notes</p><p>* Due to limited data from the description, characters in the key based on the available information. The species requires re-examination.</p><p>** Since it is impossible to reliably determine to which species of the denticulatus species group the specimens from Russia belong (specimens and their images are missing), we use in the key only the definition of this group.</p><p>*** The male of Sperchon clupeifer anulatus Wainstein, 1981 is unknown, so it is impossible to compare the dorsal plates. It is similar to S. hispidus in the presence of a sclerotized ring around the anus and dense dorsal setae on tibia IV, but in the less plumose dorsal setae on tibia IV it is more reminiscent of S. clupeifer . This subspecies has the narrowest P-4 (~8.0). It is possible that this is a separate species</p></div>	https://treatment.plazi.org/id/03C3AC5D0D084854ECF4FE3D2BB197B8	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Kolesnikov, Vasiliy B.;Stolbov, Vitaly A.	Kolesnikov, Vasiliy B., Stolbov, Vitaly A. (2025): Review of the genus Sperchon Kramer, 1877 (Acari, Hydrachnidia: Sperchontidae) from Russia. Zootaxa 5666 (1): 53-73, DOI: 10.11646/zootaxa.5666.1.2, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
