Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Chiridiella ( Genre )
Chiridiella pacifica  Brodsky, 1950   (F,M)
Syn.: ? Chiridiella macrodactyla : Tanaka, 1957 a (p.57, figs.F); Tanaka & Omori, 1970 a (p.153)
Brodsky, 1950 (1967) (p.193, Descr.F, figs.F); Bradford, 1971 b (p.21, Rem.); Deevey, 1974 (p.458, Descr.F,M, figs.F,M); Markhaseva, 1996 (p.99, figs.F,M)
Espèce Chiridiella pacifica - Planche 1 de figures morphologiquesissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.102, Fig.77].
Female. mandibular palp; Gntb: gnathobase of Md (partial). Specimen from Kuril Trench.

Nota: Mxp protopodite with 2 setae in distal group; endopodal segment 1 with 3 setae in medial part, 1.5 times longer than protopodite.

Espèce Chiridiella pacifica - Planche 2 de figures morphologiquesissued from : O. Tanaka in Publ. Seto Mar. Biol. Lab., 1957, VI (1). [p.57, Fig.35]. As Chiridiella macrodactyla. With doubt.
Female: a, forehead (lateral); b, last thoracic segment and urosome (lateral left side); c, urosome (ventral); d, Md (mandibular palp); e, Mx1; f, Mx2; g, P1.
Nota: Head and 1st thoracic segment fused, 4th and 5th fused. Rostrum absent. Proportional lengths of urosomites and furca 40:12:12:12:20:16 = 100. Furcal rami wider than long, carries short setae. A2 has 7-segmented exopod which is 1.23-times as long as endopod. Md: endopod with 3 setae on the distal segment, endopod with 5 setaeMx1: exopod wuith 5 setae, endopod with 4 setae, 3rd inner lobe with 3 setae, 1st inner lobe with 10 setae.

Espèce Chiridiella pacifica - Planche 3 de figures morphologiquesIssued 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.194, Fig.109].
Female (from NW Pacif.): habitus (dorsal and lateral left side); Mp2, Mx2, S1, P1; S2, P2; S3, P3; S4, P4.

Espèce Chiridiella pacifica - Planche 4 de figures morphologiquesissued from : G.A. Deevey in Bull. Mar. Sc., 1974, 24 (2). [p.460, Fig.12].
Female (from 32°10'N, 6°30'W): a-b, habitus (dorsal and lateral, respectively); c, Mx1; d, Md; e, P1; f, P2.
Scale at left for parts a and b; at lower right for parts c-f. Scales in mm.
Nota : Head and 1st thoracic segment separate. Cephalothorax 82-83 % of total length. Urosome about 21 % of cephalothorax length. Genital segment very protuberant ventrally. A1 24-segmented, not longer than cephalothorax. Endopod of A2 ¾ length of exopod.

Espèce Chiridiella pacifica - Planche 5 de figures morphologiquesissued from : G.A. Deevey in Bull. Mar. Sc., 1974, 24 (2). [p.461, Fig.13].
Female: a, A2; b, P3; c, P4; d, Mxp; e, Mx2.
Scale in mm.

Espèce Chiridiella pacifica - Planche 6 de figures morphologiquesissued from : G.A. Deevey in Bull. Mar. Sc., 1974, 24 (2). [p.462, Fig.14].
Male: a, habitus (lateral); b, A2; c, Md; d, left A1; e, Mx1; f, left P5; g, right P5; h, P3 (exopod segments 2 and 3 missing); i, P2; j, Mx2; k, Mxp (endopod setae not shown).
Scale on left margin for parts a; on right margin for parts b-k. Scales in mm.

Nota : Md and Mx2 greatly reduced (suggesting that the male does not eat after his final molt.
A1 longer than in female, reaching the urosome, both similar, neither geniculate.
Endopod of A2 larger and slightly longer than exopod.
Endopodal segment 2 of Md with 8 setae.
Mxp and P1 similar to that in females.
Endopod of P2 2-segmented.
Endopod and exopod of P3-P4 3-segmented.
Coxopodite of P4 without hairs.
P5 biramous, endopod 1-segmented.

Espèce Chiridiella pacifica - Planche 7 de figures morphologiquesissued from : G.A. Deevey in Bull. Mar. Sc., 1974, 24 (2). [p.459, Fig.11, a-b, d].
Male: d, P1.

Immature Male: a-b, habitus (dorsal and lateral, respectively).

Scales in mm.

Espèce Chiridiella pacifica - Planche 8 de figures morphologiquesChiridiella pacifica female;
1 - Mx2 with 3 endites (1st and 2nd endites reduced, 3rd present without setae, 4th with spines of pincer-form, 5th transformed into single curved spine; distal part of endopod represented by 2 setae).

Espèce Chiridiella pacifica - Planche 9 de figures morphologiquesChiridiella pacifica female ;
1 - Penultimate lobe of Mx2 with 1 long and 1 short spine arranged as pincers.
2 - Mx2 with only 2 highly modified lobes

Ref. compl.:
Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Ikeda & al., 2006 (p.1791, Table 2); Galbraith, 2009 (pers. comm.); Homma & al., 2011 (p.29, Table 3, abundance, feeding pattern: suspension feeders)
NZ: 5 + 1 douteuse

Carte de distribution de Chiridiella pacifica par zones géographiques
Espèce Chiridiella pacifica - Carte de distribution 2
Carte de 1996
NW Pacif., Kuril-Kamchatka, Aleutian, Is. Japan (NE), ? Japan (Suruga), Mariana Trench, S Aleutian Is., Vancouver Is., Sargasso Sea: off Bermuda: Station "S" (32°10'N, 64°30'W), W Indian.
Type locality: NW Pacific.
N: 8
(22) F: 3,1; (37) F: 3,1-2,5; M: 2,85; ? (39) F: 2,13; (224) F: 2,75-2,5; M: 2,85; {F: 2,50-3,10; M: 2,85}
Rem.: bathy-abyssopélagique.
Voir aussi les remarques en anglais
Dernière mise à jour : 26/07/2018

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2024. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur [Accédé le 03 mars 2024]

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