Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Pseudochirella ( Genus )
Pseudochirella major  (Sars, 1907)   (F,M)
Syn.: Bradyetes major Sars, 1907 a (p.9, Rem.F);
Pseudochirella fallax : Sars, 1920 c (p.6, Rem.); 1925 (p.95, figs.F, Rem.M); Grice & Hulsemann, 1965 (p.223); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Bradford & Jillett, 1980 (p.66); Markhaseva, 1989 (p.35, 40, 41, Descr.M, figs. M); 1996 (p.264, figs.F,M)
Vaupel Klein, 1995 (p.914, Rem.)
Species Pseudochirella major - Plate 1 of morphological figuresissued from : E.L. Markhaseva in proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.265, Fig.210]. As Pseudochirella fallax.
Female (19°09'S, 63°07'E)). Ce: forehead; P.md: mandibular palp; Gntb Md: gnathobase of Md (partial); CP4: coxopod of fourth leg.

Nota: Cephalothorax 4.0-4.6 times longer than urosome.
Rostrum developed weaker than in other species of genus.
Posterior corners of last thoracic segment slightly asymmetrical (dorsal view), prolonged into rounded lobes.
Genital segment slightly asymmetrical; lateral swelling on the left more prominent than on the right; genital field removed laterally (ventral view).
Urosomal segments 1-3 surface with hairs.
A1 about as long as body.
Exopodite of P1 3-segmented.
Endopodite of P2 2-segmented.
Coxopodite of P4 with 20-23 spines (14 spines recorded by Sars, 1925).

Species Pseudochirella major - Plate 2 of morphological figuresissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.266, Fig.211]. As Pseudochirella fallax.
Male (from Markhaseva, 1989).

Nota: Cephalothorax about 3.6 times longer than urosome.
Posterior corners of last thoracic segment without spines, slightly asymmetrical (dorsal view).
A1 longer than body by 2-3 last segments.
Oral parts reduced in comparison with those in females.
Exopodite of P1 3-segmented, but 1 external spine significantly shorter than in female.
Endopodite of P2 2-segmented.
Coxopodite of P4 without spines and setae.
Exopodal segment 2 of left P5 with 1 tooth, exopodal segment 3 nearly 4 times longer than wide.

Species Pseudochirella major - Plate 3 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XXVI, figs.5-9]. As Pseudochirella fallax.
Female: 5, habitus (dorsal); 6, idem (lateral left side); 7, forehead (showing the labrum), lateral; 8, frontal view; 9, basal segment of P4.

Species Pseudochirella major - Plate 4 of morphological figuresIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49).< [p.53, Fig.27].
Female off Azores Is.): 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 5 setae.
7 - Genital segment with protuberance on both right and left sides.
8 - Gnathobase posterior surface of Mx1 with 4 setae.

Compl. Ref.:
Sewell, 1948 (p.500)
NZ: 3

Distribution map of Pseudochirella major by geographical zones
Species Pseudochirella major - Distribution map 2Issued from : E.L. Markhaseva in Issled. Fauny Morei, 1989, 41 (49). [p.60, Fig.19].
Geographical distribution of P. fallax [= P. major].
2: from literature; dotted circle for Grice, Hulsemann, 1965; 3: present occurrence.
Atlant. (temperate), Azores, Caribbean, Sargasso Sea: off Bermuda: Station "S" (32°10'N, 64°30'W), SW Indian (off Rodrigues Is.)

Type locality: North Atlantic (central part).
N: 6
(1) F: 3,8; (37) F: 3,8-3,6; M: 3,2; {F: 3,60-3,80; M: 3,20}
Rem.: bathypelagic. Sargasso Sea: 1500-2000 m (Deevey & Brooks, 1977, station "S");
After an historical account concerning the generic and specific change of its form by Sars (1907, 1920, 1925), Vaupel Klein (1995, p.914-916) concludes, with regard to the nomenclatorially, justified use of the specific name major henceforth.
Last update : 30/01/2015
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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 March 31, 2023]

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