Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Chiridius ( Genus )
Chiridius pacificus  Brodsky, 1950   (F,M)
Syn.: Chiridius carnosus Tanaka, 1957 a (p.55, Descr.M, figs.M)
Brodsky, 1950 (1967) (p.154, Descr.F, figs.F, Rem.); Bradford & Jillett,1980 (p.23, figs.F, fig.73, distribution chart); Markhaseva, 1996 (p.119, figs.F,M)
Species Chiridius pacificus - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.120, Fig.91].

Species Chiridius pacificus - Plate 2 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.121, Fig.92].
Female (from different localities). GntbMd: gnathobase of Md (partial)..

Species Chiridius pacificus - Plate 3 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.122, Fig.93].
Male (from Kuril Trench). Re: exopod; P.md: mandibular palp; Abd: urosome.

Species Chiridius pacificus - Plate 4 of morphological figuresissued from : J.M. Bradford & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 86, 1980. [p.25, Fig.13].
Female: A, habitus (dorsal); B, posterior metasome and genital segment (lateral left side); C, idem (dorsal); D, P2.

Nota: The setation of the mouth parts is identical with that of C. poppei.

Species Chiridius pacificus - Plate 5 of morphological figuresissued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1957, VI (1). [p.55, Fig.34]. As Chiridius carnosus.
Male: a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and urosome (lateral left side); d, P1; e, P2; f, P5.

Nota: Head and 1st thoracic segment fused, 4th and 5th incompletely fused. Proportional lengths of urosomites and furca 18:22:25:18:2:15 = 100. A1 (23-segmented) reaches back to distal end of 2nd urosomal segment. Right A1 with segments 20 and 21 fused with long aesthetasks. Mx1: 9 setae on endopod, 5 setae on 1st outer lobe, 9 setae on exopod.

Species Chiridius pacificus - Plate 6 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.154, Fig.68].
Female (from S Okhotsk Sea): habitus (dorsal and lateral left side); last thoracic segment and urosome (dorsal); corner of the last thoracic segment and genital segment (lateral left side); Mx, Mx1; Mp1, Mx2; S1, P1; S2, P2.

Nota: A characteristic feature of the new species are the form of the thoracic spikes, which are large, slightly converging apically, and the relatively wide segments of P1.

Species Chiridius pacificus - Plate 7 of morphological figuresChiridius pacificus female:
1 - Exopod of Mx1 with 10 setae. Points of last thoracic segment reaching to the end of first third of genital segment.
2 - Endopodal segment 2 of Md wuith 8 (7 terminal and 1 posterior) setae.
3 - Points of last thoracic segment exceeding the middle of genital segment. Exopodal segment 3 of P1 with external spine 1.30-1.47 longer than external spine of segment 2.

Species Chiridius pacificus - Plate 8 of morphological figuresChiridius pacificus male:
1 - Points of last thoracic segment exceeding the posterior border of genital segment.

Compl. Ref.:
Hattori, 1991 (tab.1, Appendix); Heinrich, 1992 (p.86); 1992 a (p.749); 1995 (p.384: Rem., tab.1); Ikeda & al., 2006 (p.1791, Table 2); Galbraith, 2009 (pers. comm.)
NZ: 5

Distribution map of Chiridius pacificus by geographical zones
Species Chiridius pacificus - Distribution map 2Issued from : J.M. Bradford & J.B. Jillett in New Zealand Ocean. Inst. Memoir, 86, 1980. [p.90-91, Fig.71].
Distribution of several species of Chiridius in the Tasman Sea and around New Zealand.
Nota: Chiridius subgracilis ( = Chiridius molestus).
Okhotsk Sea, Kuril-Kamchatka, Kamchatka Trench, Vancouver Is., Japan (Sagami, off Sanriku, NE), New Zealand, off S Madagascar.

Type locality: Sea of Okhotsk (southern part)
N: 10
(22) F: 3-2,08; (37) F: 3,5-2,7; M: 2,65-2,36; (39) M: 2,36; (201) F: 3,5-2,7; {F: 2,08-3,50; M: 2,36-2,65}
Rem.: meso-bathypelagic, hyperbenthic.
Last update : 01/01/2015
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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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