Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Pseudochirella ( Genus )
Pseudochirella pacifica  Brodsky, 1950   (F,M)
Brodsky, 1950 (1967) (p.189, Descr.M, figs.M); Zvereva, 1976 (p.201, Descr.F, figs.F); Bradford & Jillett, 1980 (p.66); Markhaseva, 1989 (p.40, 41, figs.F,M); 1996 (p.281, figs.F,M)
Species Pseudochirella pacifica - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.284, Fig.227].
Female (from NW Pacif.: Kuril Trench).
Ce: forehead (lateral); CP4: coxopoid of fourth legs.

Nota: Cephalothorax about 4 times longer than urosome.
Posterior corners of last thoracic segment rounded, right one covered with hairs distally.
Genital segment asymmetrical with significant projection on the right densely covered with hairs (dorsal view).
Urosomal segments 1-3 covered with hairs;
A1 reaching the midlength of urosome.
Incomplete separation between exopodal segments 1 and 2 of P1.
Endopodite of P2 incompletely subdivided into two segments.
Coxopodite of P4 with 9-10 spines.

Species Pseudochirella pacifica - Plate 2 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.285, Fig.228].
Male (from NW Pacif.: Marian trench).
Re: exopod.

Nota: Cephalothorax about 3 times longer than urosome.
Posterior corners of last thoracic segment with small spines.
Exopodal segment 2 of left P5 with 1 tooth distally.

Species Pseudochirella pacifica - Plate 3 of morphological figuresissued from : J.A. Zvereva in Crustaceana, 1976, 31 (2). [p.202, Figs.13-20].
Female (from Okhotsk Sea): 13, habitus (dorsal); 14, idem (right lateral side); 15, rostrum (frontal view); 16, A2; 17, Mxp; 18, P1; 19, coxopod of P4; 20, genital somite (ventral).
Nota: Rostrum large, non bifid. A1 reaching the posterior margin of the genital segment. Inner ramus of A2 longer than half of the external ramus. 4th and 5th thoracic segments separate. Urosome almost 5 times as short as the cephalothorax. Genital segment asymmetrical; on the right side there is a prominence covered with dense setae.

Species Pseudochirella pacifica - Plate 4 of morphological figuresIssued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.189, Fig.105].
Male (from NW Pacif.): habitus (dorsal and lateral left side); S1, P1; S5, P5 (Le = left leg; Ri = right leg)S5LeEn, endopod of left P5.

Species Pseudochirella pacifica - Plate 5 of morphological figuresIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49).< [p.53, Fig.24].
Female: Thoracic segment 5 and genital segment.
Nota from the key:
1 - Genital segment strongly asymmetrical.
2 - Both left and right thoracic posterior corners without spines.
3 - Thoracic posterior corners with rounded lobes.
4 -Thoracic posterior corners slightly asymmetrical.
5 - Genital field present in the middle part of genital segment (ventral view).
6 - Third internal lobe of Mx1 with 4 setae.
7 - Genital segment with protuberance only on the right side (dorsal view).

Species Pseudochirella pacifica - Plate 6 of morphological figuresPseudochirella pacifica Male:
1 - Exopodite 2 of left P5 with 1 tooth in its distal part.
2 - Posterior corners with spines.
3 - Exopodite 3 of left P5 only slightly longer than wide.

Compl. Ref.:
Yamaguchi & al., 2002 (p.1007, tab.1); Ikeda & al., 2006 (p.1791, Table 2); Galbraith, 2009 (pers. comm.); Homma & Yamaguchi, 2010 (p.965, Table 2); Homma & al., 2011 (p.29, Table 2, abundance);
NZ: 4

Distribution map of Pseudochirella pacifica by geographical zones
Species Pseudochirella pacifica - Distribution map 2Issued from : E.L. Markhaseva in Issled. Fauny Morei, 1989, 41 (49). [p.58, Fig.15].
Geographical distribution of P. pacifica present occurrences and in the Bering Sea (Motoda, Minoda, 1974), hatchured.
Station Knot, Okhotsk Sea, Kuril-Kamchatka, Mariana Trench, Bering Sea (Aleutian Basin), Vancouver Is., Philippines.

Type locality: NW Pacific (off SE Cape Shipunsky).
N: 9
(22) M: 6,1; (37) F: 7,6-7; M: ±6; (261) F: 7,6-7,4; {F: 7,00-7,60; M: 6,00-6,10}
Rem.: bathy & abyssopelagic.
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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