Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Euchirella ( Genus )
Euchirella pseudopulchra  Park, 1976   (F)
Syn.: Euchirella pulchra : Davis, 1949 (p.31, figs.F, ? M)
Ref.:
Park, 1976 (p.208, Descr.F, figs.F); Bradford & Jillett, 1980 (p.33); Gardner & Szabo, 1982 (p.238, figs.F); Vaupel Klein, 1984 a (p.41, 44, figs.F, Table II: characters, Rem.); Markhaseva, 1996 (p.162, figs.F); Ohman & Townsend, 1998 (p.61, figs., Rem. egg )
Species Euchirella pseudopulchra - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.163, Fig.125].
Female (specimens from NW Pacif.). Ce: forehead (lateral); Abd: urosome (dorsal).

: Nota: Cephalothorax 4 times longer than urosome.
Rostrum small.
A1 reaching the end of urosomal segment 2.
A2 with long exopod and small endopod that is less than half length of exopodal segment 2; coxopodite, basipodite and endopodal segment 1 with 1 seta each.
Genital segment with wide round swelling in anterior part of left side and depressed in its midlength on the right.
Exopodal segment 1 of P1 with 2 external spines equal in length.


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


Species Euchirella pseudopulchra - Plate 3 of morphological figuresissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.75, Fig.13, c, d].
Conditions of the presence or absence of the single seta (arrows) of group I on the basipodite 1 of Mxp (all right appendages in medial aspect).
Euchirella pulchra: c, with small, smooth seta (arrowed).
Euchirella pseudopulchra: d, seta absent (arrowed).


Species Euchirella pseudopulchra - Plate 4 of morphological figuresissued from : C.C. Davis in Univ. Wash. Publs Biol., 1949, 14. [Pl.3, Figs.42-43]. As Euchirella pulchra.
Female (from NE Pacific): 42, forehead (lateral); 43, last thoracic segment and urosome (lateral).

Nota : Low crest on the forehead. Rostrum small. Genital segment asymmetrical (in dorsal view), with a depression on the right side and a stout protuberance on the left side. A1 reach about to the caudal rami.


Species Euchirella pseudopulchra - Plate 5 of morphological figuresissued from : C.C. Davis in Univ. Wash. Publs Biol., 1949, 14. [Pl.4, Figs.44-48].
Female: 44, basipod of P4; 45, urosome (dorsal); 46, 2nd endopodal segment of A2; 47, A2.
Endopod of A2 about 2/5 the length of exopod ; last segment of endopod with 11 setae. 1st basal segment of P4 with 2 or 3 prominent spines on the inner border.

Male (with doubt in this species): 48, P5.
Nota : Urosome symmetrical, with a very short anal segment that is divided longitudinally. Right P5 with a well developed chela, the outer claw formed by the exopod and the inner claw by the endopod. Left P5 with an extremely rudimentary endopod, so that it appears almost uniramous, the le gis short, somewhat longer than the two segments of the basipod of the right leg.


Species Euchirella pseudopulchra - Plate 6 of morphological figuresissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.65, Fig.6 i].
Euchirella pseudopulchra: a, Setal armature of endopodte 2+3 of A2. Conditions are expressed are expressed in formulae as follows: number of setae in regular row on proximal lobe / relative development of seta in position no. 9 on this lobe / number of setae in approximately linear row on terminal lobe / relative development of appendicular seta no. 7 and its supporting pedestral (absent, vestigial, moderate or well developed: see Table I, p.87 and Table II, p.93).
upper and lower lobes = proximal and terminal lobes (details of right appendage shown in medial aspect.
Scale bar = 0.133 mm.

Nota: Condition 7/1/6/1.


Species Euchirella pseudopulchra - Plate 7 of morphological figuresEuchirella pseudopulchra female:
1 - Genital segment asymmetrical.
2 - Crest present.
3 - Coxopodite of P4 with 2-3 spines.


Species Euchirella pseudopulchra - Plate 8 of morphological figuresissued from : T. Park in Crustaceana, 1976, 31 (2). [p.209, Fig.1].
Female: A, habitus (dorsal); B, same (lateral); C, posterior part of body (dorsal); D, same (lateral); E, last metasomal and genital segments (lateral); F, forehead (dorsal); G, same (lateral); H, A2; I, P1 (anterior); J, P2 (anterior); K, P4 (posterior); L, coxa of P4 (posterior).

Nota: Proportional length Prosome:Urosome about: 80:20.
- Viewed laterally, forehead squarish, a minute crest clearly visible dorsally or laterally.
- Rostrum small and single, pointing directly downward.
- 1st pediger separated from cephalosome by a clear line of joint, 4th and 5th pedigers fused, with posterolateral corners broadly rounded in lateral view, but angular in dorsal view.
- Dorsally, genital segment asymmetrical, with a broad, round swelling anteriorly on left side and a depression midway on right side. Dorsal wall of genital segment markedly hollow, with a low ridge anteriorly on right side. Genital swelling pronounced, occupying distal part of segment.
- A1 reaching distal end of 2nd urosomal segment.
- A2 with long exopod and small endopod, about 1/2 the length of 1st exopodal segment; 2 distal lobes of endopod, each with 6 setae.
- Mx1 with 13 setae on 1st, 4 on 2nd, and 2 on 3rd inner lobe; 3 on basis, 4 on endopod, 11 on exopod, and 6 on outer lobe.
- Mx2 with 5 lobes of approximately equal size, each bearing 3 setae, and small distal part provided with 6 setae.
- Mxp consisting of thick coxa, slender basis, and short 5-segmented endopod.


Species Euchirella pseudopulchra - Plate 9 of morphological figuresissued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.66, Fig.7, r].
Euchirella pseudopulchra: Structural feature of exopodite 1 and exopodite 2 of A2 (lateral aspects of left appendages and medial views of right antennal parts; compare with Fig.7n which represents left A2 medial face drawn from a lateral view).
r, medial.


Species Euchirella pseudopulchra - Plate 10 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.70, Fig.10, c].
Euchirella pseudopulchra: Structure and setal complement on the outer lobe of basis 1 of Mx1 (detail of left appendage in posterior aspect). 6 setae with the 3rd from proximal being reduced in size.


Species Euchirella pseudopulchra - Plate 11 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.93, Table II].
Euchirella pseudopulchra 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 pseudopulchra - Plate 12 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.94, Table II (cont' d)].
Euchirella pseudopulchra 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 pseudopulchra - Plate 13 of morphological figuresIssued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.95, Table II (cont' d)].
Euchirella pseudopulchra 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.:
Shih & Marhue, 1991 (tab.2, 3); Rebstock, 2001 (tab.2); 2002 (p.71, Table 3, climatic variability); Kosobokova & al., 2007 (p.929: Tab.7); Galbraith, 2009 (pers. comm.)
NZ: 3

Distribution map of Euchirella pseudopulchra by geographical zones
Loc:
British Columbia, California, San Diego, Okhotsk Sea, Kuril-Kamchatka Trench
N: 7
Lg.:
(37) F: 4,35-3,55; (59) F: 4,4-3,4; (243) F: 4,35-4,2; (1257) F: 3,55-3,85; {F: 3,40-4,40}
Rem.: epipelagic - 1200 m.
For Vaupel Klein (1984, p.43) in spite some polymorphy in both E. pseudopulchra and E. pulchra, it seems justified to distinguish between these two forms. Characters which appear to provide unambiguous reference to either species thus are presence of a crest, and presence of the group I seta on basipodite 1 of Mxp (see figure 13).
Last update : 22/02/2021
    to add your remark
  

 Any use of this site for a publication will be mentioned with the following reference :

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 February 24, 2021]

© copyright 2005-2021 Sorbonne University, CNRS

Webmaster
CNRS   Observatoire Océanologique de Banyuls sur Mer - Laboratoire Arago
Sorbonne Université

 

Version française
English version

 

Search

On the WEB of CNRS

 


Marine Planktonic Copepods

Marine Planktonic Copepods

 

Imprimer Contact Accueil Plan du site Accès restreint Retour Une du Labo Imprimer Contact Plan du site Crédits Téléchargez les Plug-Ins