identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
432F0B5AFF99FFF1FF0BFCB710BBF879.text	432F0B5AFF99FFF1FF0BFCB710BBF879.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Gurjanovometopa Labay 2025	<div><p>Genus Gurjanovometopa gen. nov.</p><p>Type species. Gurjanovometopa onenusica sp. nov.</p><p>Species. Gurjanovometopa onenusica sp. nov. from the shelf of south-west Sakhalin Island (the Sea of Japan).</p><p>Diagnosis. Body small, smooth above. Antenna 1 lacking nasiform process on article 1. Accessory flagellum absent. Palp of mandible 1-articulate; palp of maxilla 1 uniarticulate. Inner plate of maxilla 2 ordinary. Inner plates of maxilliped well separated; outer plate short, 1/10 times as palp article 1 length. Gnathopod 1 small, simple, merus and carpus with long narrow posterodistal lobe each; propodus elongated almond-shaped, without palmar margin. Gnathopod 2 enlarged, palm slightly oblique, with posterior tooth, carpus short, lobed. Pereopods 5–7 with rectolinear basis. Urosomite 1 ordinary, not highly elongate. Urosomites 1–3 free; pleonite 3 lacking dorsal process; urosomite 1 not weakly extended posterodorsally. Telson ordinary, linguiform, flat.</p><p>Distribution. The coastal shallow waters of the Strait of Tartary (Sea of Japan) off southwestern Sakhalin Island (Fig. 1).</p><p>Relationships. Gurjanovometopa gen. nov. differing from the other genera of Metopelloides group in the elongated almond-shaped propodus and by long posterodistal lobes of merus and carpus of gnathopod 1; and by the fully separated inner plates of maxilliped. Gurjanovometopa gen. nov. is similar to Pycnopyge Krapp-Schickel, 2000 in the structure of gnathopod 1 (Shoemaker 1955; Krapp-Schickel 2000), but differs from it in the structure of mandible (with palp) and subchelate gnathopod 2 (in Pycnopyge the gnathopod 2 is propodochelate).</p><p>Differing from Aurometopa Barnard &amp; Karaman, 1987, Goratelson J.L. Barnard, 1972, Knysmetopa Barnard &amp; Karaman, 1987, Kyphometopa Krapp-Schickel, 2013, Ligulodactylus Krapp-Schickel, 2013, Malvinometopa Krapp-Schickel, 2011, Mesoproboloides Gurjanova, 1938, Mesometopa Gurjanova, 1938, Metopa Boeck, 1871, Metopoides Della Valle, 1893, Parametopa Chevreux, 1901, Proboloides Della Valle, 1893, Prometopa Schellenberg, 1926, Prostenothoe Gurjanova, 1938, Scaphodactylus Rauschert &amp; Andres, 1993, Stenothoe Dana, 1852, Stenothoides Chevreux, 1900, Stenula J.L. Barnard, 1962, Synkope Krapp-Schickel, 1999, Torometopa Barnard &amp; Karaman, 1987, Victometopa Krapp-Schickel, 2011, Wallametopa J.L. Barnard, 1974 in the narrower basis of pereopod 7; from Hardametopa Barnard &amp; Karaman, 1991, Metopella Sars, 1892, Probolisca Gurjanova, 1938 in the reduction of the mandibular palp to 1 article, from Parametopella Gurjanova, 1938 and Sandrothoe Krapp-Schickel, 2006 by the presence of 1-articulate palp of mandible (Barnard &amp; Karaman 1991; Bellan-Santini 2005; Gurjanova 1938; Krapp-Schickel 1999, 2006, 2011a, 2013; Rauschert &amp; Andres 1993).</p><p>Etymology. The genus Gurjanovometopa is named in the memory of the Russian carcinologist Evpraksia F. Gurjanova combined with the older genus name Metopa . The name is feminine in gender.</p></div>	https://treatment.plazi.org/id/432F0B5AFF99FFF1FF0BFCB710BBF879	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	Labay, Vjacheslav S.	Labay, Vjacheslav S. (2025): Gurjanovometopa onenusica gen. nov., sp. nov. (Crustacea: Amphipoda: Stenothoidae) from the Russian coasts of the Sea of Japan. Zootaxa 5661 (3): 407-419, DOI: 10.11646/zootaxa.5661.3.7, URL: https://doi.org/10.11646/zootaxa.5661.3.7
432F0B5AFF9CFFF5FF0BFF6311A2FF0B.text	432F0B5AFF9CFFF5FF0BFF6311A2FF0B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stenothoinae Boeck 1871	<div><p>Key to genera of Stenothoinae Boeck, 1871</p><p>1. Basis of pereopod 7 rectolinear.......................................................................... 2</p><p>– Basis of pereopod 7 expanded.......................................................................... 10</p><p>2. Palp of mandible present............................................................................... 3</p><p>– Palp of mandible absent................................................................................ 9</p><p>3. Palp of mandible 2 or 3-articulate........................................................................ 4</p><p>– Palp of mandible 1-articulate............................................................................ 6</p><p>4. Gnathopod 1 subchelate.......................................................... Probolisca Gurjanova, 1938</p><p>– Gnathopod 1 small, simple.............................................................................. 5</p><p>5. Pereonit 4 with dorsal medial keel........................................ Hardametopa Barnard &amp; Karaman, 1991</p><p>– Pereonit 4 without dorsal medial keel..................................................... Metopella Sars, 1892</p><p>6. Peduncular articles 1 of antenna 1 with nasiform lobe, urosomite 1 carinate dorsally. Zaikometopa Barnard &amp; Karaman, 1987</p><p>– Peduncular articles 1 of antenna 1 without nasiform lobe, urosomite 1 smooth –.................................... 7</p><p>7. Gnathopod 1 subchelate........................................................ Metopelloides Gurjanova, 1938</p><p>– Gnathopod 1 small, simple.............................................................................. 8</p><p>8. Merus and carpus of gnathopod 1 short, unlobed............................... Vonimetopa Barnard &amp; Karaman, 1987</p><p>– Merus and carpus of gnathopod 1 with long posterodistal lobes............................ Gurjanovometopa gen. nov.</p><p>9. Gnathopods 1 and 2 different from each other in size and shape, gnathopod 1 small, simple...................................................................................................... Parametopella Gurjanova, 1938</p><p>– Gnathopods 1 and 2 subchelate, similar in size and shape, palm oblique and as long as propodus in Gn1.......................................................................................... Sandrothoe Krapp-Schickel, 2006</p><p>10. Palp of mandible present.............................................................................. 11</p><p>– Palp of mandible absent............................................................................... 27</p><p>11. Palp of mandible 2 or 3-articulate....................................................................... 12</p><p>– Palp of mandible 1-articulate........................................................................... 24</p><p>12. Antenna 1 bearing nasiform process on peduncular article 1............................ Prometopa Schellenberg, 1926</p><p>– Antenna 1 lacking nasiform process on peduncular article 1................................................... 13</p><p>13. Accessory flagellum of antenna 1 with 2 articles............................................................ 14</p><p>– Accessory flagellum of antenna 1 with 1 article or without.................................................... 17</p><p>14. Antenna 1 shorter than antenna 2........................................... Torometopa Barnard &amp; Karaman, 1987</p><p>– Antenna 1 subequal or longer than antenna 2.............................................................. 15</p><p>15. Antenna 1 subequal to antenna 2 in length........................................... Metopoides Della Valle, 1893</p><p>– Antenna 1 longer than antenna 2........................................................................ 16</p><p>16. Gnathopods 1, 2 subchelate, different in size and shape...................... Scaphodactylus Rauschert &amp; Andres, 1993</p><p>– Gnathopods 1, 2 with relatively small difference in size and shape.................. Ligulodactylus Krapp-Schickel, 2013</p><p>17. Pereopod 7 basis posteriorly narrowing................................................................... 18</p><p>– Pereopod 7 basis with round posterior margin.............................................................. 19</p><p>18. Basis of pereopod 6 rectolinear.............................................. Mesometopa Gurjanova, 1938 (part)</p><p>– Basis of pereopod 6 rectangularly widened, distally narrowing.................... Malvinometopa Krapp-Schickel, 2011</p><p>19. Palp of maxilla 1 2-articulate........................................................................... 20</p><p>– Palp of maxilla 1 1-articulate........................................................................... 23</p><p>20. Carpus of gnathopod 1 short, shorter than propodus........................... Aurometopa Barnard &amp; Karaman, 1987</p><p>– Carpus of gnathopod 1 long, subequal or longer than propodus................................................ 21</p><p>21. Antenna 1 shorter than antenna 2............................................. Kyphometopa Krapp-Schickel, 2013</p><p>– Antenna 1 subequal to antenna 2 in length................................................................. 22</p><p>22. Basis of pereopod 6 not expanded............................................. Mesoproboloides Gurjanova, 1938</p><p>– Basis of pereopod 6 expanded.................................................... Proboloides Della Valle, 1893</p><p>23. Basis of pereopod 6 rectolinear.............................................. Mesometopa Gurjanova, 1938 (part)</p><p>– Basis of pereopod 6 expanded, rounded.................................................... Metopa Boeck, 1871</p><p>24. Basis of pereopod 6 not expanded.................................................. Stenothoides Chevreux, 1900</p><p>– Basis of pereopod 6 expanded.......................................................................... 25</p><p>25. Palp of mandible 2-articulate; carpus of gnathopod 1 short, shorter than propodus........... Prostenothoe Gurjanova, 1938</p><p>– Palp of mandible 1-articulate; carpus of gnathopod 1 long, subequal or longer than propodus........................ 26</p><p>26. Gnathopod 2 slightly enlarged, palm weakly oblique..................................... Stenula J.L. Barnard, 1962</p><p>– Gnathopod 2 strongly enlarged, palm almost vertical, posterior margin very short....... Victometopa Krapp-Schickel, 2011</p><p>27. Pereopod 5 with rectangular weakly expanded basis................................... Goratelson J.L. Barnard, 1972</p><p>– Pereopod 5 with rectolinear basis........................................................................ 28</p><p>28. Inner plate of maxilla 2 ordinary, produced................................................................ 29</p><p>– Inner plate of maxilla 2 unproduced...................................................................... 31</p><p>29. Gnathopod 1 small, simple, dactyl short and stubby................................. Wallametopa J.L. Barnard, 1974</p><p>– Gnathopod 1 subchelate, dactylus thin.................................................................... 30</p><p>30. Gnathopod 2 extremely large, palm strongly oblique.......................... Knysmetopa Barnard &amp; Karaman, 1987</p><p>– Gnathopod 2 slightly enlarged, palm almost transvers................................... Parametopa Chevreux, 1901</p><p>31. Rostrum about as long as head, acute.............................................. Synkope Krapp-Schickel, 1999</p><p>– Head without distinct rostrum, truncate.................................................... Stenothoe Dana, 1852</p></div>	https://treatment.plazi.org/id/432F0B5AFF9CFFF5FF0BFF6311A2FF0B	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	Labay, Vjacheslav S.	Labay, Vjacheslav S. (2025): Gurjanovometopa onenusica gen. nov., sp. nov. (Crustacea: Amphipoda: Stenothoidae) from the Russian coasts of the Sea of Japan. Zootaxa 5661 (3): 407-419, DOI: 10.11646/zootaxa.5661.3.7, URL: https://doi.org/10.11646/zootaxa.5661.3.7
432F0B5AFF9EFFFAFF0BF9601518FDA1.text	432F0B5AFF9EFFFAFF0BF9601518FDA1.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Gurjanovometopa onenusica Labay 2025	<div><p>Gurjanovometopa onenusica sp. nov.</p><p>Figures 1–6</p><p>Type material. Holotype, female, 2.4 mm, Mb-1269 (Zoological Museum of MSU), the Sea of Japan, Strait of Tartary, shelf of the south-western Sakhalin Island (46°13'208 N 141°53'353 E, 15 m), coarse sand with grit, 14 October 2023, V. S. Labay . Paratype: 1 male, 2.9 mm, Mb-1270 (Zoological Museum of MSU), with same data as holotype . Paratypes: 7 females, X 54727 / 2486 ( Zoological Museum of Far East Federal University), the Sea of Japan, Strait of Tartary, shelf of the south-western Sakhalin Island (46°07'317 N 141°54'581 E, 15 m), a crevice between rocks filled with grit, 17 May 2024, V. S. Labay . 9 males, X 54728 / 2487 ( Zoological Museum of Far East Federal University), with same data as previous .</p><p>Type locality. The south-western coast of Sakhalin Island, Strait of Tartary, Sea of Japan, Far East of Russia (46°13'208 N 141°53'353 E, 15 m).</p><p>Etymology. The species name onenusica derived from the river Onenusi near the type locality.</p><p>Diagnosis. Antenna 1 of male, articles of flagellum with aesthetascs. Mandibular palp with 2 apical setae only. Maxilliped, inner plate apically with single short robust seta (spine) and one simple seta. Gnathopod 1 small, simple, merus and carpus with long posterior lobe each, propodus elongate, almond-shaped, posterior margin of dactylus with 1–2 setae. Gnathopod 2 large, with slightly oblique palmar margin, anterior margin of basis of pereopods 3–4 with 1–2 short setae distally. Telson long, linguiform.</p><p>Description. Holotype, female (2.4 mm; Mb-1269). Body is colorless in alcohol. Pereonites, Pleonites, and Urosomites smooth. Coxal plate 1 small, indistinct; coxal plates 2 and 3 large, the third it is 1.5 times wider than previous one; coxal plate 4 extremely large; coxal plates 5–7 small.</p><p>Head. Rostrum small. Ocular lobes rounded triangular. Eyes colorless in alcohol, round, medium. Antenna 1 short, ca. 0.3 times of body length; peduncular articles 1–3 with length ratio of 1.00:0.63:0.55, article 1 stout, with 2 plumose setae near antero-distal corner; accessory flagellum absent; flagellum with 5 articles. Antenna 2 slightly longer than antenna 1, slender; peduncular articles 3–5 with length ratio of 1.0:1.5:1.5, articles 2 and 3 with few setae at the antero-distal and postero-distal angles each; flagellum with 4 articles, terminal article bearing a crown of setae distally. Labrum, apical lobes slightly asymmetric. Mandibles, incisors wide, with 7–8 distal denticles; laciniae mobilis broad, left one fan-shaped, with 10 denticles, right one rectangular, with 10 denticles; accessory blades 6 in left, 7 in right; palp l-articulate, relatively short, slender, with 2 apical “E” setae. Lower lips, inner lobes weak, rounded; outer lobes triangular-rounded at distal margin. Maxilla 1 with small inner plate bearing single seta; outer plate with 6 large robust setae and one thin seta apically, medial margin bearing several feeble setae; palp l-articulate, tip of palp acutely projected, with 3 robust setae, with a subapical row of 2 setae. Maxilla 2, inner plate with 4 apical setae; outer plate longer, truncated, with 5 setae on the tip. Maxilliped; distal margins of inner plates each bearing one robust spine-like seta and one short seta; distomedial lobe of outer plate short, tip with 3 short setae, lateral margin with one short seta; palp, length ratio of articles 1–4 being as 1.0:0.7:1.1:1.3, articles 1 and 2 wide, medial margins with 3–4 robust setae, article 3 with a group of 4 robust setae on distomedial corner and with sublateral row of thin setulae on the inner surface, article 4 slightly curved, medial margin bearing a row of numerous feeble setae.</p><p>Pereon. Gnathopod 1 small; basis stubby, anterior margin smooth, posterodistal corner with 2 short setae; merus with the long postero-distal lobe bearing 6 robust setae on the tip and with a row of short thin setae posteriorly, inner surface with a field of short setulae; carpus short, with the long postero-distal lobe bearing 2 specific robust comb setae and one specific trifurcate seta, distal margin with a row of 4 long setae along inner surface; propodus long, simple, almond-shaped, narrowed distally, without palm, with single seta in the distal half of anterior margin, with 2 long and 2 short setae along posterior margin, inner surface with a short row of numerous feeble setae; dactylus slightly curved inside, with one seta at the posterior margin. Gnathopod 2 subchelate, stout; basis straight, anterior margin lined with 2 evenly-spaced rare short setae, posterodistal corner with short seta; merus rectangular posterodistally, posterior margin smooth, posterodistally with 2–3 short setae; carpus with posterior lobe bearing 2 specific robust comb setae on the tip and with a row of feeble setulae on the inner surface along distal margin; propodus stout, slightly dilated distally, ca. 3 times length of carpus, palm slightly oblique, with a powerful tooth at the postero-distal corner bearing robust spine-like seta subapically, with a rare row of short setae along palmar margin and with robust spine-like seta at the base of postero-distal tooth, inner surface with a pair of robust spine-like setae postero-distally; dactylus curved posteriorly. Pereopod 3 slender; basis, anterior and posterior margins with few short setae along distal 1/3; propodus ca. 1.2 times as long as carpus, posterior margin with 3 short setae along the distal half; dactylus narrow, 0.4 times as long as propodus, posterior margin is smooth. Pereopod 4 slender, similar to pereopod 3; propodus with 4 rare short setae along posterior margin. Pereopod 5 longer than pereopod 4; basis straight, anterior margin lined with 2 tiny setae; merus with short posterodistal process bearing one long seta at the tip, merus and carpus, anterior margin each with one short robust seta and 2 setae at the antero-distal corner each; propodus thin, anterior margin with 1–2 short robust setae; dactylus narrow, 0.5 times as long as propodus, posterior margin is smooth. Pereopods 6 and 7 similar to pereopod 5.</p><p>Pleon. Epimeral plates 1–3, posterodistal corners produced; ventral margin of epimeral plate 1 with 2 short setae, ventral margins of plates 2 and 3 with one short seta each. Pleopods slender, pleopod 3 the shortest; peduncles with paired retinacula (coupling spines) on inner distal margin; inner ramus shorter than outer ramus; inner ramus of pleopods with 4–5 articles, outer ramus of pleopods 1 and 2 with 6 articles, outer ramus of pleopod 3 with 4 articles. Uropod 1 long; peduncle without dorsolateral robust setae; rami short, 0.35 times as long as peduncle, outer ramus slightly longer than inner ramus, smooth, inner ramus with single dorsal robust seta. Uropod 2 ca. 0.6 times as long as uropod 1, peduncle and rami without dorsolateral robust setae; rami 0.7 times as long as peduncle, outer ramus slightly longer than inner ramus. Uropod 3 ca. 0.65 times as long as uropod 2, peduncle smooth; single ramus 2- articulate, article 1 with single seta at the base of article 2, article 2 subequal to article 1 in length, tip acute. Telson ca. 2.4 times longer than broad, smooth.</p><p>Paratype, male (2.9 mm; Mb-1270) (fig. 6). Similar to female. Males differ from females in the structure of antenna 1 and antenna 2, in the armament of the carpus of gnathopod 1, in the structure of the propodus of gnathopod 2, and in the structure of the pleopods. Morphological differences between male and female shown in the table 1. Sexual dimorphism is distinctly marked in the structure of gnathopod 2. In male propodus of gnathopod 2 smaller than in female, 0.64 times as long as basis, expanded distally, the tooth at the postero-distal corner wide (width equals to length) with crenulated posterior margin. In female propodus of gnathopod 2 large, 0.92 times as long as basis, not expanded distally, the tooth at the postero-distal corner narrow (length exceeds the width), posterior margin of tooth not crenulated.</p><p>Variations. In the armaments of postero-distal lobe of carpus of gnathopod 1 in males and females (2 specific robust comb setae and one specific trifurcate seta or 3 specific robust comb setae or 2 specific robust comb setae only).</p><p>Ecology: Gurjanovometopa onenusica found in the depth range of 10–15 m on the coarse sand with grit among rocks. The water temperature in the habitat of the species varied from 2.6 to 5.3ºC in May and June inclusive and from 4.5 to 14.3ºC in July—October.</p><p>Distribution. The coastal shallow waters of the Strait of Tartary (Sea of Japan) off southwestern Sakhalin Island in the zone of the cold water (cold spot of Makarov), which is caused by the influx of a tidal wave spreading from the Sea of Okhotsk onto the Rock “Stone of danger” in the Laperouse Strait [Shevchenko et al., 2005; Mitnik et al., 2006].</p></div>	https://treatment.plazi.org/id/432F0B5AFF9EFFFAFF0BF9601518FDA1	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	Labay, Vjacheslav S.	Labay, Vjacheslav S. (2025): Gurjanovometopa onenusica gen. nov., sp. nov. (Crustacea: Amphipoda: Stenothoidae) from the Russian coasts of the Sea of Japan. Zootaxa 5661 (3): 407-419, DOI: 10.11646/zootaxa.5661.3.7, URL: https://doi.org/10.11646/zootaxa.5661.3.7
