Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Euchirella ( Genus )
Euchirella unispina  Park, 1968   (F,M)
Syn.: Euchirella acuta Tanaka & Omori, 1969 (p.34, figs.F,M); Guangshan & Honglin, 1984 (p.118, tab.); Shih & Young, 1995 (p.67)
Park, 1968 (p.546, figs.F,M); Tanaka & Omori, 1969 a (p.159, Rem.); Vaupel Klein, 1972 (p.497, 502, 505, fig.F); 1984 a (p.47, fig.F); Markhaseva, 1996 (p.173, figs.F,M)
Species Euchirella unispina - Plate 1 of morphological figuresIssued from : T.S. Park in Fishery Bull. Fish Wild. Serv. U.S., 1968, 66 (3). [p.547, Pl.6, Figs.1-21].
Female: 1, habitus (dorsal); 2, forehead (left lateral side); 3, last thoracic segment and urosome (left lateral side); 4, urosome (dorsal); 5, genital somite (ventral); 6, A1; 7, A2; 8, Md; 9, Mx1; 10, Mx2; 11, Mxp; 12, P1; 13, P2; 14, P3; 15, P4.

Male: 16, habitus (dorsal); 17, idem (left lateral side); 18, forehead (left lateral side); 19, last thoracic segment and urosome (dorsal); 20, A1; 21, A2.

Species Euchirella unispina - Plate 2 of morphological figuresIssued from : T.S. Park in Fishery Bull. Fish Wild. Serv. U.S., 1968, 66 (3). [p.548, Pl.7, Figs.1-11].
Male: 1, Md (mandibular palp); 2, Mx1; 3, Mx2; 4, Mxp; 5, P1; 6, P2; 7, P3; 8, P4; 9, P5 (posterior); 10, terminal part of left P5 (posterior); 11, idem (anterior).

Species Euchirella unispina - Plate 3 of morphological figuresissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.63, Fig.5, i].
Female: i, setal armature of basipodite 2 of A2 (note: a single, long seta).
Scale bar 0.2 mm.

Species Euchirella unispina - Plate 4 of morphological figuresissued from : O. Tanaka & M. Omori in Publ. Seto mar. Biol. Lab., 1969, XVII, 1. [p.35, Fig.1]. As Euchirella acuta.
Female (from Pacific): a, forehead (lateral); b-c, last thoracic segment and urosome (dorsal and lateral, respectively); d, A2; e, Mx1; f, Mxp; g, P1; h, P4 (1st basal segment).

Male: i, forehead (lateral); j, Mx1; k, P1; l, P5; m, left P5 (distal segment of exopod); n, another view of the same.

Species Euchirella unispina - Plate 5 of morphological figuresIssued from : J.C. von Vaupel-Klein in Zool. Meded., Leiden, 19972, 47 (41). [p.511, Fig.5, c].
Female (from 1°48'N, 123°20.5'E): Endopodite of right P1 (anterior view).

Nota: 'organ of Vaupel Klein' (see explanation to Euchirella curticauda.)

Species Euchirella unispina - Plate 6 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.173, Fig.135]. After Park, 1968.
Female & Male

Species Euchirella unispina - Plate 7 of morphological figuresEuchirella unispina female:
1 - Genital segment slightly asymmetrical.
2 - Crest absent.
3 - Genital segment with lateral side elongated on the left posteriorly (dorsal view).
4 - Coxopodite of P4 with 1 spine.
5 - Posterior border of genital segment with projection on the right, exceeding the anterior border of urosomal segment 2. Left projection absent.

Species Euchirella unispina - Plate 8 of morphological figuresEuchirella unispina male:
1 - P5 uniramous on left P5 and large biramous on right P5. Exopodal segment 2 and endopod of right P5 elongated and sharpened in their distal parts forming tongs. Endopod of right P5 significantly exceeding distal border of exopodal segment 1 of right P5.
2 - Crest absent.
3 - No spine present near place wherefrom exopod of right P5 begins.
4 - Left P5 without rudimentary endopod. When closed tongs of exopod of left P5 compact, rounded, clavate-like.
5 - Proximal part of exopodal segment 1 of right P5 with 1 big tooth.
6 - Proximal part of endopodal segment 1 of right P5 without tooth, but closer to the midlength of segment with 1 medium sized tooth.

Compl. Ref.:
Morris, 1970 (p.2300); Heinrich, 1990 (p.17)
NZ: 6

Distribution map of Euchirella unispina by geographical zones
Indian (off NW Cocos Is.), Indonesia-Malaysia, China Seas (East China Sea, South China Sea) , Pacif. ( N central subtropical), Japan (Izu), Pacif. (W equatorial), off Peru, SE Pacif. (tropical).

Type locality: 31°54'N, 155°00'W.
N: 12
(72) F: 4,89-4,28; 4,03-3,84; (110) F: 4,78; 4,7; M: 3,89-3,85; (111) F: 4,64; {F: 4,28-4,89; M: 3,85-3,89}
Rem.: epiplagic.
This species is closely related to E. truncata but can easily be distinguished from that of the latter by the shape of the genital somite.
Last update : 22/01/2016
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2018. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Sorbonne Université, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed March 20, 2018]

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