Eogammarus tiuschovi Derzhavin, 1927
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publication ID |
https://doi.org/ 10.1080/00222930600828859 |
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publication LSID |
lsid:zoobank.org:pub:41F5583D-BD6D-4FFF-961F-39AA6A6ECCE8 |
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persistent identifier |
https://treatment.plazi.org/id/BF741C1D-B225-5706-FE1F-80B4FE3BAAEF |
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treatment provided by |
Felipe |
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scientific name |
Eogammarus tiuschovi Derzhavin, 1927 |
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Eogammarus tiuschovi Derzhavin, 1927 View in CoL
[Japanese name: Ryûkotsu togeo yokoebi, new]
( Figures 33–36 View Figure 33 View Figure 34 View Figure 35 View Figure 36 ) Carinogammarus tiuschovi Derzhavin 1927, p 6 –8, Plate 3. Anisogammarus (Eogammarus) tiuschovi: Schellenberg 1937, p 274 ; Gurjanova 1951, p 778–
780, Figure 543; Kurenkov and Mednikov 1959, p 83, Figure 4 View Figure 4 ; Tzvetkova 1972, p 214; Tzvetkova 1975, p 114–118, Figure 43. Eogammarus tiuschovi: Bousfield 1979, p 314 . Material examined
Japan. 3 „, 11.8–13.9 mm, 2♀, 9.3 mm, 10.5 mm, ovigerous, Lake Yudo (42 ° 369360N, 143 ° 329300E), Toyokoro Town , Nakagawa County, Hokkaido, 16 August 2002, collected by K. Tomikawa. 1 „, 9.0 mm, 2♀, 6.9 mm, 8.0 mm, Notsuke Bay (43 ° 359300N, 145 ° 139370E), Nakashibetsu Town, Shibetsu County, Hokkaido, 28 May 2002, collected by K. Wada. 1 „, 9.6 mm, 2♀, 8.4 mm, 8.6 mm, Lake Kuccharo (45 ° 079460N, 142 ° 199150E), Hamatonbetsu Town , Esashi County , Hokkaido, 12 July 2002, collected by K. Wada. Four juveniles, 6.6–7.9 mm, Lake Pashikuru (42 ° 559220N, 144 ° 009020E), Onbetsu Town , Shiranuka County, Hokkaido, 11 June 2002, collected by K. Tomikawa. Russia. One juvenile, 5.2 mm, Lake Busse (46 ° 329390N, 143 ° 229300E), north of Aniva Bay , Sakhalin Island , 19 July 2002, collected by J. Toft. „, 9.8 mm, ♀, 5.2 mm, ovigerous, Chayvo estuary (52 ° 219200N, 143 ° 069590E), east of Chayvo Bay, Sakhalin Island, 28 July 2002, collected by J. Toft. 2 „, 10.6 mm, 11.0 mm, ♀, 8.0 mm, Mereya River (46 ° 379410N, 142 ° 539390E), east of Korsakov, Sakhalin Island , 7 August 2002, collected by J. Toft.
Description of male (13.6 mm from Lake Yudo)
Antenna 1 ( Figure 33B View Figure 33 ): peduncular articles 1:2: 3 in ratio of 1.0:0.7:0.4; article 1 with slender posterodistal seta in place of robust seta, posterior margin with four pairs of short setae and four short setae; article 2 posterior margin with three pairs of short setae; article 3 posterior margin bare; accessory flagellum five-articulate; primary flagellum 30-articulate, each article with one short aesthetasc ( Figure 33C View Figure 33 ). Antenna 2 ( Figure 33D View Figure 33 ): peduncular article 1 with slender setae; articles 4: 5 in ratio of 1.0:0.9, posterior margins of articles 4 and 5 with three clusters of short setae; flagellum 14-articulate, with cup-calceoli ( Figure 33E View Figure 33 ).
Pleon ( Figures 33A View Figure 33 , 35F–H View Figure 35 ): carinate, dorsal margin of pleonites 1–3 ( Figure 35F–H View Figure 35 ) with minute setae.
Mandible ( Figure 33H–J View Figure 33 ): palp article 2 with four inner and two outer marginal and 19 inner submarginal setae; article 3 length 0.8× article 2 length, with two clusters of A-setae and two A-setae. Maxilla 1 ( Figure 33K View Figure 33 ): inner plate with 14 plumose setae medially; palp article 1 with two setae on outer margin; article 2 with five setae on outer margin, seven stout and eight slender setae apically. Maxilla 2 ( Figure 33L View Figure 33 ): inner plate with 13 facial setae. Maxilliped ( Figure 33M View Figure 33 ): inner plate with three apical and three medial bent, stout setae; outer plate beyond middle of palp article 2; outer distal corner of palp article 2 with slender and robust setae.
Gnathopod 1 ( Figure 34A View Figure 34 ): anterior margin of propodus with two clusters of setae; palmar margin ( Figure 34B View Figure 34 ) lined with one robust outer simple seta, 11 inner and three outer robust, striated peg setae. Gnathopod 2 ( Figure 34C View Figure 34 ): anterior margin of propodus with cluster of setae, palmar margin ( Figure 34D View Figure 34 ) lined with seven inner and six outer robust, striated peg setae and three stiff outer pectinate setae.
Pereopod 3 ( Figure 34E View Figure 34 ): merus, carpus, and propodus in ratio of 1.0:0.6:0.9. Pereopod 4 ( Figure 34F View Figure 34 ): merus, carpus, and propodus in ratio of 1.0:0.9:1.2. Pereopod 6 ( Figure 34H View Figure 34 ): posterior margin of basis with short setae. Pereopod 7 ( Figure 34I View Figure 34 ): posterior margin of basis with short stiff setae, longest seta 0.6× width of ischium, posterodistal part with robust seta.
Epimera 1–3 ( Figure 35I–K View Figure 35 ): with setose anterior margins. Epimeron 1 ( Figure 35I View Figure 35 ): with setose ventral margin, posterior margin with 10 setae. Epimeron 2 ( Figure 35J View Figure 35 ): ventral margin with seven robust and one short setae, submargin with two robust setae, posterior margin with six setae. Epimeron 3 ( Figure 35K View Figure 35 ): ventral margin with seven robust and two tiny setae, posterior margin with three setae.
Uropod 1 ( Figure 35C View Figure 35 ): inner and outer ramus length 0.8× peduncle length, latter with robust marginal setae and short seta; inner ramus with three inner marginal robust setae; outer ramus with one outer and two inner marginal robust setae. Uropod 2 ( Figure 35D View Figure 35 ): inner ramus length 1.0×, outer ramus length 0.8× peduncle length, latter with robust marginal setae; inner ramus with two robust inner marginal setae; outer ramus with robust outer marginal seta. Uropod 3 ( Figure 35E View Figure 35 ): inner ramus length 0.3× outer ramus length; outer margin of outer ramus with three clusters of robust setae and a single robust seta and a few simple and plumose setae, inner margin with two clusters of robust setae and few simple and numerous plumose setae; terminal article of outer ramus length 0.2× proximal article length. Telson ( Figure 35O View Figure 35 ): length 1.1× width; apical robust setae longer than apical slender setae; cleft 71%.
Description of female (10.5 mm from Lake Yudo)
Antenna 1 ( Figure 36A View Figure 36 ): peduncular articles 1:2: 3 in ratio of 1.0:0.7:0.3, article 1 posterior margin with three pairs of short setae and three short setae, article 2 posterior margin with two pairs of setae and one seta, article 3 posterior margin with cluster of setae; accessory flagellum five-articulate; primary flagellum 29-articulate, each article with one aesthetasc. Antenna 2 ( Figure 36B View Figure 36 ): peduncular articles 4 and 5 about equal in length, posterior margin of both articles with two clusters of setae, respectively; flagellum 12-articulate, lacking cupcalceoli.
Gnathopod 1 ( Figure 36C View Figure 36 ): palmar margin of propodus ( Figure 36D View Figure 36 ) with nine robust simple setae on inner part. Gnathopod 2 ( Figure 36E View Figure 36 ): palmar margin of propodus ( Figure 36F View Figure 36 ) with six robust simple setae on inner margin and six stiff pectinate setae on outer distal part.
Pereopod 6 ( Figure 36I View Figure 36 ): posterior margin of basis with short setae. Pereopod 7 ( Figure 36J View Figure 36 ): posterodistal margin of basis with stiff setae, longest seta 0.6× width of ischium.
Uropod 3 ( Figure 36K View Figure 36 ): inner ramus length 0.3× outer ramus length; outer margin of outer ramus with three clusters of robust setae and a few simple and plumose setae, inner margin with cluster of robust setae and a few simple setae and 10 plumose setae; terminal article of outer ramus length 0.2× proximal article length.
Variation
The number of clusters of setae on peduncular articles of both antennae 1 and 2 varies from two to four.
Remarks
Eogammarus tiuschovi is readily distinguishable from its congeners by the presence of dorsally carinate pleonites. Eogammarus tiuschovi is similar to E. possjeticus , but is distinguished from the latter by the four characters mentioned in the remarks of E. possjeticus (see Table I). Eogammarus tiuschovi is also similar to E. kygi , but is distinguished from the latter by the following features ( E. kygi in parentheses): (1) on antenna 1, a slender seta is present posterodistally on peduncular article 1 (robust seta); (2) on antenna 2, the calceolus is about 0.25× as wide as the article (greater than 0.25× as wide); (3) calceoli are absent on female antenna 2 (present); (4) on male pereopod 6, the longest seta on the posterior margin of the basis is shorter than half the ischium width (longer); (5) on the telson, the robust apical setae are longer than the slender apical setae (shorter); and (6) the telson is longer than wide (shorter) (see Table I).
Distribution
Sea of Okhotsku coast of Russia, Primorskiy (Sea of Japan coast of Russia), Kamchatka, Kuril Islands, Sakhalin, Hokkaido.
Habitat
Brackish lakes, estuaries.
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