Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Euchirella ( Genus )
Euchirella grandicornis  Wilson, 1950   (F)
Syn.: Euchirella galeata : Giesbrecht, 1892 (part. p.241, Pl.36, fig.22); C. B. Wilson, 1950 (p.221, F pro parte, non Pl.9, fig.89, Pl.23, fig.337 )
Ref.:
C. B. Wilson, 1950 (part., p.223, figs.F pro parte: Pl.9, fig.89, non M); Tanaka & Omori, 1969 (p.45, figs.F, Rem.); Bradford & Jillett, 1980 (p.32, Rem.); Vaupel Klein, 1984 a (p.38, Table II: characters, Rem.); Markhaseva, 1996 (p.156, figs.F)
Species Euchirella grandicornis - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.158, Fig.120].
Female (specimen from the Philippines Sea). Ce: forehead (dorsal, left aand right lateral, respectively; CP4: coxopod of P4.

Nota: Cephalothorax 4.0-4.6 times longer than urosome.
Rostrum small, pointed.
A1 23-segmented, reaching the end of caudal rami.
Exopod of A2 2.6 times longer than endopod; endopodal segment 2 with 6 setae on each lobe.
Gnathobase of Mx1 with 3 setae on posterior surface, and 4 and 2 setae (Tanaka & Omori, 1969, mentioned 3 setae) on 2nd and 3rd internal lobes respectively; protopodite near endopod base with 3 setae; endopod with 4 setae (3 after Tanaka & Omori, 1969); exopod with 11 setae; external lobe with 7-8 setae.
Genital segment nearly as long as wide, asymmetrical, with small projection on back side in posterior half on the left (dorsal and lateral view)


Species Euchirella grandicornis - Plate 2 of morphological figuresissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.61, Fig.4, c].
Female: c, helmet-shaped crest on forehead (left lateral side).


Species Euchirella grandicornis - Plate 3 of morphological figuresissued from : C.B. Wilson in Bull. U.S. natn. Mus., 1950, 100, 14 (4). [Pl. 10, Figs.101, 103, 104-105].
Female (from 18°47'S, 89°26'W): 101, habitus (dorsal); 103, idem (lateral); 104,Mx2; 105, Mxp.


Species Euchirella grandicornis - Plate 4 of morphological figuresissued from : C.B. Wilson in Bull. U.S. natn. Mus., 1950, 100, 14 (4). [Pl. 9, Figs.98-100].
Female: 98, A2; 99, Md; 100, P4.


Species Euchirella grandicornis - Plate 5 of morphological figuresissued from : O. Tanaka & M. Omori in Publ. Seto mar. Biol. Lab., 1969, XVII, 1. [p.46, Fig.5].
Female (from Pacific): a-b, forehead (dorsal and lateral, respectively); c-d, last thoracic segment and urosome (dorsal and lateral, respectively); e, A2; f, Mx1; g, P1; h, P4; i, lateral spine of the 1st basal segment of P4.


Species Euchirella grandicornis - Plate 6 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.36, Fig.22]. As Euchirella galeata.
Female: 22, urosome (lateral).


Species Euchirella grandicornis - Plate 7 of morphological figuresEuchirella grandicornis female:
1 - Genital segment asymmetrical.
2 - Crest present.
3 - Coxopodite of P4 with 1 spine.
4 - Posterior corners of last thoracic segment symmetrical, rounded-rectangular (dorsal and lateral view). Endopodal segment 2 of A2 with 6 setae on each lobe.
5 - Crest low.


Species Euchirella grandicornis - Plate 8 of morphological figuresissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.66, Fig.7, e].
Euchirella grandicornis e, A2 arrangements of spinules and hairs on the posterior edge of endopodite 2+3 (right appendage of medial view ): ± 10 long spinules distally plus a proximal bundle of more than 10 thin hairs (or: hair-like spinules).


Species Euchirella grandicornis - Plate 9 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.93, Table II ].
Euchirella grandicornis Female: Datamatrix stating observed states of characters from Table I (p.87-90) presently examined; nos. refer to the input nos. used in Table I (see to the family Aetideidae).


Species Euchirella grandicornis - Plate 10 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.94, Table II (cont' d) ].
Euchirella grandicornis Female: Datamatrix stating observed states of characters from Table I (p.87-90) presently examined; nos. refer to the input nos. used in Table I (see to the family Aetideidae).


Species Euchirella grandicornis - Plate 11 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.95, Table II (cont' d) ].
Euchirella grandicornis Female: Datamatrix stating observed states of characters from Table I (p.87-90) presently examined; nos. refer to the input nos. used in Table I (see to the family Aetideidae).

Compl. Ref.:
Galbraith, 2009 (pers. comm.)
NZ: 4

Distribution map of Euchirella grandicornis by geographical zones
Loc:
Peru - Easter Island, NE Pacif. (tropical), SE Indian (in Chiba & al., 1957 a, p.11), Vancouver Is.
N: 7
Lg.:
(110) F: 6,8-5,97; (137) F: 7; (1257): 6,0-6,7; {F: 5,97-7,00}
Rem.: mesopelagic-?.
The female is often confused with E. galeata.For Vaupel Klein (1984 a, p.39), apart from the general shape, female can only be distinguished from E. galeata by (1) shape of crest and rostrum, (2) shape of the genital somite, (3) shape of the spine on basis 1 of P4, (4) number of spinules on basipodite 2 of Mxp (47, but 28 for E. galeata).
Prior to the actual distinction of these two forms, authors have not always distinguoished between them. This implies that some descriptions may pertain to mixed collections of E. galeata and E. grandicornis (Giesbrecht, 1892 and Wilson, 1950 bear witness of such condition.
Last update : 22/02/2021
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 06, 2021]

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