Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Temoridae ( Family )
            Eurytemora ( Genus )
Eurytemora caspica  Sukhikh & Alekseev, 2013   (F,M)
Ref.:
Sukhikh & Alekseev, 2013 (p.88, Descr.F, M, Table 1, 2, Fig.10, 11, 12).
Species Eurytemora caspica - Plate 1 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.90, Fig. 3].
Female (from 45°48'N, 49°38'E): a, habitus (dorsal); b, genital dopuble-somite (ventral); c, urosome (ventral). Scale bar: a, b = 200 µm; c = 100 µm.

Nota:
- Cephalosome + 4 free thoracic segment (67/ 64 /50 /42).
- Forehead oval;
- Last t§horacic segment with 1-2 small spines on wing-like outgrowths of lateral margin.
- Genital double-somite symmetrical, 1.7 times as wide as long with 2 relatively short spines on both sides.
- Caudal rami divergent, 8.1 times as long as wide, with long and strong hair-setae on both sides, as well as on last abdominal somite.
A1 of 25 segments, reaching end of 5th thoracic somite


Species Eurytemora caspica - Plate 2 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.91, Fig. 4].
Female: a, P5; b, P5 (paratype); c, left A1. Scale bar: a, b = 100 µm; c = 200 µm.

Nota:
- P5 rudimentary, uniramous, 4-segmented; narrow coxal plate bearing 1-segmented basis; exopod 2-segmented, 1st segment with inner outgrowth oriented about 45° to segment axis and 2 lateral spines, distal segment with long apical seta and short lateral spine about half of apical seta. Tiny spine inserted between these 2 appendages about 10% or less of short spine length and shorter than distal seta width in insertion place.


Species Eurytemora caspica - Plate 3 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.92 Fig. 5].
Female: a, A2; b, Md; c, Mx1 ( ventral view); d, Mx2; e, Mxp. Scale bar: 50 µm.

Nota:
Md: Coxa with gnathobasis, 1 of its tooth (outermost) significantly larger than others; coxa in middle with biramous palp, basis with 4 setae, 8-segmented exopod and 5-segmented endopod. Distal segment of exopod with 2 sub-equal setae, other segments bearing single long seta each; distal segment of endopod with 2 long setae, 2 and 4 segments with 1 long setae each, 3 and 5- with 2 long setae each.
Mx1: biramous composed of precoxa with medial arthrite bearing 8 strong claw-like spines (7 relatively long); coxa with elongated endite bearing 6 long setae and outer outgrowth with 9 very strong sub-equal in length setae and 1 thin seta; basis composed of basal endite, 1-segmented endopod with 9 long subequal setae and 4-segmented exopod bearing 5-5-4-7 (distally) long setae.
- Mx2 uniraous. composed of precoxa with 2 endites; distal endite bearing 3 long setae, 1st segment with 4 setae; coxa with 2 endites bearing 2 long and 1 short setae each and 5-segmented endopod including basal endite with 2 long, 1 short setae and 4 short segments bearing 1 or 2 long distal setae.
- Mxp: uniramous, 9-segmented; short precoxa with 1 seta and long; coxa with 3 hill-shaped endites bearing 2-3-3 setae; basis more wide in middle part with 3 long setae and with complex of long hairs; endite with 2 long setae followed by 5-segmented endopod armed with 2-2-2-2-4 (distally) setae


Species Eurytemora caspica - Plate 4 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.93 Fig. 6].
Female: a, left P1 (anterior view); b, P2 (anterior view); c, P3 (anterior view); d, P4 (anterior view). Scale bar : 100 µm. Arrow indicates seta segmentation.:


Species Eurytemora caspica - Plate 5 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.94 Fig. 7].
Male: habitus (dorsal view).. Scale bar: 200 µm.


Species Eurytemora caspica - Plate 6 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.95 Fig. 8].
Male: a, right A1; b, detail of right A1: segments 8-12; c, Md. Scale bar: a = 150 µm; b, c = 50 µm.


Species Eurytemora caspica - Plate 7 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.96, Fig. 9].
Male: P1 (anterior view); b, P2 (anterior view); c, P3 (anterior view); d, P4 (anterior view). Scale bar: 100 µm.


Species Eurytemora caspica - Plate 8 of morphological figuresIssued from : N.M. Sukhikh & V.R. Alekseev in Proc. Zool. Inst. RAS, 2013, 317 (1). [p.97, Fig. 10].
Male: P5. Arrow indicating W1 and W2, W1 is more wide part of P5 right leg last segment, W2 is width of this segment end near the outgrowth (arrow indicating). Scale bar: 100 µm.

Loc:
N Caspian Sea, delta of Volga River. Type locality : 45°48'N, 49°38'E.
N: 1
Lg.:
(1236) F: 0,856; M: 0,881; {F: 0856; M: 0,881}
Rem.: For Sukhikh and Alekseev (2013, p.85, 97) this species belongs to Eurytemora affinis complex after mitochondrial genes, showing some differences between the Caspian and the Japanese specimens. See the species type E. affinis (Poppe, 1880), and differences between the three forms (species) from the Elbe Estuary (the North Sea), the Chesapeake Bay (USA) and the Caspian Sea.

See to Eurytemora affinis complex, key of the sibling species.
Last update : 25/10/2019
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