Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Euchirella ( Genre )
Euchirella formosa  Vervoort, 1949   (F,M)
Syn.: Euchirella trigrada Tanaka, 1957 b (p.184, figs.F);
E. orientalis : Tanaka & Omori, 1969 (p.52, figs.F,M)
Vervoort, 1949 (p.29, Descr.F, figs.F); 1963 b (p.134: Rem.); Morris, 1970 (p.2300, 2304, figs.F); Bradford & Jillett, 1980 (p.35, figs.F, Rem, fig. 73, distribution chart); Vaupel Klein, 1984 a (p.38, Rem.); Markhaseva, 1996 (p.154, figs.F, M); Bradford-Grieve & al., 1999 (p.879, 921, figs.F,M)
Espèce Euchirella formosa - Planche 1 de figures morphologiquesissued from : Tanaka O. in Publ. Seto mar. Biol., Lab., 1957, 6 (2). [Fig.49, p.185]. As Euchirella trigrada.
Female from Suruga): habitus (dorsal aspect); b, head (lateral aspect); c, last thoracic segment and urosome (lateral view, left side); d, A2;: e, Mxp.; f, P1; g, outer margin of exopodite of P2; h, inner margin of basal joints of P4.

Nota Female:
- Cephalothorax about 4.83 the abdomen length.
- Head and 1st pediger segmant separate, 4th and 5th thoracic segments fused.
- Rostrum directs straight forwards , rostral spine moderately long..
- Abdomen 4-segmented; segments and caudal rami in the proportional lengths 60 : 20 : 8 : 6 : 16 = 100.
- Gental segment which is as deep as wide is shorter than wide; segment in dorsal view slightly asymmetrical; there are on the left side 3 lamellous proeesses of which the distal 2 are broad at the base; there is a blunt process on the right side; genital area as that of E. truncata.
- Caudal rami shorter than wide.
- A1 23-segmented, reaches back to distal end of caudal rami.
- A2 exopod about 3.7 times as long as endopod; 1st basal segment with a tuft of hairs on the posterior surface.
- Mx1 as that of E. messinensis; 2nd basal segment with 3 setae; endopod with 4 setae; exopod with 11 setae.Mx2 as that of E. rostrata.
- Mxp with sinuate anterior margin on 2nd basal segment.
- P2 with strong outer edge spines on exopodal segments.
- Terminal spines of exopod of P2 to P4 with each 20 teeth.
- P4 with 2 subequal spines on posterior surface of coxa.

Espèce Euchirella formosa - Planche 2 de figures morphologiquesissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.155, Fig.117].
Female (specimen from Kuril). mandibular palp; Ce: forehead (lateral).

Espèce Euchirella formosa - Planche 3 de figures morphologiquesissued from : J.M. Bradford & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 86, 1980. [p.37, Fig.22].
Female: A, habitus (lateral right side); B, idem (dorsal); C, genital segment (lateral left side); D, basipod 1 of P4.

Espèce Euchirella formosa - Planche 4 de figures morphologiquesIssued from : W. Vervoort in Zool. Verh., Leiden, 1949, 5. [p. 30, Fig.14].
Female (from Timor Sea): a, habitus (dorsal); b, forehead (lateral); c, urosome (dorsal).

Nota: A1 (24-free segments) reaches the distal margin of the 1st urosomal segment.The abdominal segments and furca in the proportional lengths 55:10:11:10:14 = 100.

Espèce Euchirella formosa - Planche 5 de figures morphologiquesIssued from : W. Vervoort in Zool. Verh., Leiden, 1949, 5. [p. 31, Fig.15].
Female (from Timor Sea): a,urosome (lateral right side); b, idem (lateral left side); c, P1; d, basal portion of P4, showing the spines of the 1st basal segment.

Espèce Euchirella formosa - Planche 6 de figures morphologiquesissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.74, Fig.12, a, g].
Female: a, setal armature of exopod of Mx1 (left one in posterior aspect; all setae are plumose as shown in one).
Nota: 11 setae, the wide-spread condition in the other genera and in most Euchirella spp.; g, spinules on the distal margin of the 5th endite of Mx2 (left appendage in postero-medial aspect).

Espèce Euchirella formosa - Planche 7 de figures morphologiquesissued from : O. Tanaka & M. Omori in Publ. Seto mar. Biol. Lab., 1969, XVII, 1. [p.53, Fig.7]. As Euchirella orientalis.
Female (from Izu Region, Japan): a, forehead (lateral); b-c, last thoracic segment and urosome (lateral and dorsal, respectively).

Male: d, forehead (lateral); e, Mx1; f, P1; g, P5; h, left P5 (distal segment of exopod; i, idem (another specimen).

Espèce Euchirella formosa - Planche 8 de figures morphologiquesissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.82, Fig.17, j].
Female:terminal part of basipodal segment 2 and endopod of right Mxp (medial view).
Scale bar 0.2 mm.
Nota: Compare grossly enlarged endopodal segment 2 in Undeuchaeta as opposed to the regular condition found in (see fig.17, i in U. incisa).

Espèce Euchirella formosa - Planche 9 de figures morphologiquesissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.80, Fig.16, x].
Female: o, arrangement of medial spines on the posterior face of basal segment 1 of right P4 .
Scale bar 0.1 mm.
Nota: 2 subequal stout spines on a common base, situated under a wider angle than E. pulchra and E. messinensis indica, but as also usually observed in E. slendens and E. venusta; both spines of E. messinensis indica and E. formosa are generally representative of the species, but individual variation in the angle between the two spines is not uncommon.

Espèce Euchirella formosa - Planche 10 de figures morphologiquesissued from : B. Morris in J. Fish. Res. Bd Canada, 1970, 27 (12). [p.2305, Fig.3].
Female (from N Pacif. sbutropical): A, forehead (lateral); B, urosome (lateral); C, same (dorsal); D, right A1; E, A2; F, Md (madibular palp); G, Mx1; H, Mx2; I, Mxp; J, P1 (anterior); K, basipodite 1 of P4 (posterior).

Espèce Euchirella formosa - Planche 11 de figures morphologiquesEuchirella formosa female:
1 - Genital segment asymmetrical.
2 - Crest absent.
3 - Genital segment with left lateral side swelled, right projection also present, smaller than the left one (dorsal view).
4 - Coxopodite of P4 with 2 spines.
5 - Endopodal segment 1 of Md without seta.
6 - Posterior part of dorsal side of genital segment with 3 projections (left lateral view).

Espèce Euchirella formosa - Planche 12 de figures morphologiquesEuchirella formosa male:
1 - P5 biramous, endopod of left leg rudimentary. Exopodal segment 2 and endopod of right leg elongated and shapened in their distal parts forming tongs. Endopod of right P5 significantly exceeding distal border of exopodal segment 1 of right leg.
2 - Crest present, low.
3 - Basipodite of left P5 nearly as long as right coxopodite of right P5.
4 - Parts of exopodal segment 3 of left P5 tongs not equal in length.

Espèce Euchirella formosa - Planche 13 de figures morphologiquesissued from : Tanaka O. in Publ. Seto mar. Biol., Lab., 1957, 6 (2). [p.185]. As Euchirella trigrada.
Female A1: proportional lengths of segments.
- A1 23-segmented, reaches back to distal end of caudal rami.
- Segments 3, 7, 9, 14 and 18, each with a long seta; aesthetascs found on segments 9, 2, 14 and 19/

Ref. compl.:
&De Decker & Mombeck, 1964 (p.12); Fleminger, 1967 a (tabl.1); Grice Hulsemann, 1967 (p.15); 1968 (tab.2); Björnberg, 1973 (p.324, 386); Galbraith, 2009 (pers. comm.); C.E. Morales & al., 2010 (p.158, Table 1); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.)
NZ: 10

Carte de distribution de Euchirella formosa par zones géographiques
Espèce Euchirella formosa - Carte de distribution 2Issued from : J.M. Bradford & J.B. Jillett in New Zealand Ocean. Inst. Memoir, 86, 1980. [p.88-89, Figs.65-67].
Distribution of several species of Euchirella in the Tasman Sea and around New Zealand.
Nota: Euchirella indica (= Euchirella massinensis indica).
E South Africa, S Brazil, E & SW Indian, Timor Sea, Strait of Macassar, off Philippines, Japan, Kuril-Kamchatka, Pacif. (central N), Vancouver Is., Pacif. (N central subtropical), New Zealand, California, off IJuan Fernandez Is., Chile (S, Concepcion).

Type locality: 10°49'S, 123°59'E.
N: 18
(37) F: 5,5-4,8; M: 5,2-4,75; (41) F: 5,2-5,1; (56) F: 5,23; (92) F: 5,38-4,75; (110) F: 5,25; M: 5,2-4,75; (201) F: 5,5-4,8; {F: 4,75-5,50; M: 4,75-5,20}

The mean female size is 5.151 mm (n = 10; SD = 0.2837) and the mean male size is 4.975 mm (n = 4; SD = 0.2598). The size ratio (male : female) is 0.96.
Rem.: épipélagique.
Voir aussi les remarques en anglais
Dernière mise à jour : 07/12/2020

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2021. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur [Accédé le 20 janvier 2021]

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