Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Pseudochirella ( Genus )
Pseudochirella divaricata  (Sars, 1905)   (F)
Syn.: Gaidius divaricatus Sars, 1905 b (p.10, Rem.F);
Pseudeuchirella divaricata: Björnberg, 1973 (p.324, 388)
Sars, 1925 (p.91, figs.F); Rose, 1933 a (p.111, figs.F);Bradford & Jillett, 1980 (p.66); Markhaseva, 1989 (p.38); 1996 (p.262, figs.F); Vives & Shmeleva, 2007 (p.598, figs.F,M, Rem.)
Species Pseudochirella divaricata - Plate 1 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.261, Fig.207].
Female (from S Indian: off Rodriguez Is).Ce: forehead (lateral); P.md: mandibular palp; GntbMd: ganthobase of Md (partial); CP4: coxopod of P4.

Nota: Cephalothorax about 3.4 times longer than urosome.
Posterior corners of last thoracic segment wing-like (dorsal view), slightly asymmetrical, each with spine.
Genital segment symmetrical, with moderate widening in nearly the midlength of segment, twice longer than wide and as long as 3 following segments together. Body surface with chitinous thickenings.
Urosomal segments 2-3 with hairs.
A1 nearly as long as cephalothorax, or body.
Exopodite of P1 3-segmented.
Endopodite of P2 2-segmented.
Coxopodite of P4 with 21 spines (According to Sars, 1925, with 8-12 spines).

Species Pseudochirella divaricata - Plate 2 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XXV, figs.5-7].
Female (from off Azores and Europa): 5, habitus (dorsal); 6, idem (lateral left side); 7, basipodal segment of P4.

Nota: Head and 1st thoracic segment with weak suture ( visible only in dorsal view), Th4 and Th5 separate.
Endopodite of P2 distinctly articulated with suture well marked.
Basipodal segment (= Coxa) of P4 with 12 thin spines on inner margin arranged in fan-shaped.

Species Pseudochirella divaricata - Plate 3 of morphological figuresIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49). [p.52, Fig.9].
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 with expansion ending in spines .
4 - Genital segment length twice longer than wide.

Compl. Ref.:
Jespersen, 1934 (p.66); Lysholm & al., 1945 (p.20); Sewell, 1948 (p.348, 500); Wilson, 1942 a (p.205); 1950 (p.317); Fagetti, 1962 (p.21); Grice & Hulsemann, 1967 (p.15); Deevey & Brooks, 1977 (p.256, tab.2, Station "S")
NZ: 6

Distribution map of Pseudochirella divaricata by geographical zones
Species Pseudochirella divaricata - Distribution map 2
Chart of 1996
Species Pseudochirella divaricata - Distribution map 3Issued from : E.L. Markhaseva in Issled. Fauny Morei, 1989, 41 (49). [p.59, Fig.18].
Geographical distribution of P. divaricata.
1: from literature; 2: present occurrence.
off W Canary Is., Bay of Biscay - Azores, Sargasso Sea off Bermuda: Station "S" (32°10'N, 64°30'W), Greenland (S Davis Strait), SW Indian (off E Madagascar), Philippines (Sulu Sea), off SE Easter Is., S Chile.

Type locality: 36°17'N, 28°53'W.
N: 9
(1) F: 4,4; (37) F: 4,4-4,3; {F: 4,30-4,40}
Rem.: bathypelagic. Sargasso Sea: 1500-2000 m (Deevey & Brooks, 1977, station "S");
Last update : 22/08/2018
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed November 30, 2023]

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