Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Pseudochirella ( Genus )
Pseudochirella vervoorti  Tanaka & Omori, 1969   (F)
Tanaka & Omori, 1969 a (p.166, Descr.F, figs.F); Bradford & Jillett, 1980 (p.67); Markhaseva, 1989 (p.38, 59, fig.F); 1996 (p.293, figs.F)
Species Pseudochirella vervoorti - Plate 1 of morphological figuresissued from : O. Tanaka & M. Omori in Publ. Seto Mar. Biol. Lab., 1969, XVII (3). [p.167, Fig.5].
Female (from Izu Region, Japan): a, habitus (dorsal); b-c, forehead (dorsal and lateral, respectively); d-f, posterior prosome and urosome (dorsal, right side and left side, respectively); g, A2; h, Mx1; i, Mxp; j, P1; k, P2; l, P3; m, P4; n, inner margin of 1st basal segments of P4.

Species Pseudochirella vervoorti - Plate 2 of morphological figuresIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49). [p.52, Fig.10].
Female: Thoracic segment 5 and genital segment.
Nota from the key:
1 - Genital segment symmetrical.
2 - Thoracic posterior corners segment 5 ± asymmetrical.
3 - Corners of thoracic segment 5 not in expansion, rounded, with 1 sine on the right side.
4 - Genital segment length nearly as long as wide.

Nota Female: Complement from Markhaseva (1996, p.293):
Cephalothorax about 4.5 times longer than urosome.
5th thoracic segment asymmetrical; with spine on the right.
Genital segment symmetrical, barrel-like.
Urosomal segments covered with hairs.
A1 reaching the distal border of anal segment.
Exopod of P1 3-segmented, with indistinct separation between exopodal segments 1 and 2.
Endopod of P2 2-segmented.
Coxopodite of left P4 with 12 spines, right with 9 spines.

NZ: 2

Distribution map of Pseudochirella vervoorti by geographical zones
Species Pseudochirella vervoorti - Distribution map 2Issued from : E.L. Markhaseva in Issled. Fauny Morei, 1989, 41 (49). [p.59, Fig.17].
Geographical distribution of P. vervoorti.
1: from Tanaka, Omori, 1969; 2: present occurrence.
Japan (Izu), Mariana Trench.

Type locality: Japan (Izu region).
N: 3
(111) F: 5,71; 5,66; {F: 5,66-5,71}
Rem.: bathy & abyssopelagic.

Markhaseva (1996, p.294) remarks that Tanaka & Omori (1969) noted close connection between this species and P. vervoorti Vervoort, 1949, but distinguished the species in segmentation of P2 endopod (1-segmented in P. semispina vs 2-segmented in P. vervoorti), in highter number of spines on coxopodite of P4 (7-8 in P. semispina vs 9-12 in P. vervoorti), in different proportion of endopod and exopod of A2 (exopod 1.2 times endopod in P. semispina), and in different arrangement of hairs on genital segment.
Last update : 30/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 25, 2024]

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