Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Pseudochirella ( Genre )
Pseudochirella mawsoni  Vervoort, 1957   (F,M)
Syn.: Pseudochirella notacantha : Vervoort, 1957 (p.67, Descr. M, figs.M);
Pseudochirella tuberosa Grice & Hulsemann, 1968 (p.327, tab.2);
Pseudeuchirella mawsoni: Björnberg, 1973 (p.324, 388)
Ref.:
Vervoort, 1957 (p.64, Descr.F, figs.F); Park, 1978 (p.172, figs.F,M, Rem.); Bradford & Jillett, 1980 (p.68, figs.F,M, fig.73, distribution chart); Markhaseva, 1989 (p.40,41, figs.F, M); Razouls, 1994 (p.82, figs.F,M); Markhaseva, 1996 (p.272, figs.F,M); Bradford-Grieve & al., 1999 (p.879, 923, figs.F,M);
Espèce Pseudochirella mawsoni - Planche 1 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.174, Fig.48].
Female: A, habitus (dorsal view); B, idem (lateral right side); C, posterior part of metasome and urosome (dorsal); D, genital segment (dorsal); E, idem (ventral); F, A2; G, Mx2; H, P1 (anterior); I, P4 (posterior).


Espèce Pseudochirella mawsoni - Planche 2 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.175, Fig.49].
Male: A, habitus (dorsal view); B, idem (left side); C, forehead (lateral); D, posterior part of metasome and urosome (dorsal); E, idem (left side); F, P1 (anterior); G, P2 (idem); H, P5 (viewed from right side); I, two distal exopodal segments of left P5 (anterior); J, idem (posterior)


Espèce Pseudochirella mawsoni - Planche 3 de figures morphologiquesissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.274, Fig.219].
Female. Th5 & Gn (dorsal view) from Antarctic.: Atlantic sector., other figures from Antarcti: Indian sector. Ce: forehead (lateral); P4: coxopod of fourth legs.

Nota: Cephalothorax 3.3-4.0 times longer than urosome.
Posterior corners of last thoracic segment rounded.
Genital segment asymmetrical: right side in its posterior part with significant projection, left one swollen in its midlength (dorsal view).
Configuration of genital segment varying.A1 reaching the end of genital segment - the end of caudal rami.
Exopodite of P1 3-segmented with indistinct separation between segment 1 and 2.
Endopodite of P2 incompletely 2-segmented.
Coxopodite of P4 with 6-10 spines.


Espèce Pseudochirella mawsoni - Planche 4 de figures morphologiquesissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.275, Fig.220].
Male (from SE Pacif.) Ce: forehead (lateral); Re: exopod.

Nota: Cephalothorax 2.6-3.3 times longer than urosome.
Cephalon and thoracic segment 1 as 4th and 5th segments completely fused.
Posterior corners of last thoracic segment rounded, with spines on both sides (removed dorsally).
A1 reaching urosomal segment 2.
Oral parts reduced in comparison with those in females.
Exopodite of P1 3-segmented; external spine on exopodal segment 1 very small.
Endopodite of P2 indistinctly 2-segmented.
Left exopodal segment 2 of P5 with 2 teeth in the distal part of the segment; exopodal segment 3 about twice longer than wide.


Espèce Pseudochirella mawsoni - Planche 5 de figures morphologiquesissued from : J.M. Bradford & J.B. Jillett in Mem. N.Z. oceanogr. Inst., 86, 1980. [p.70, Fig.47].
Female: A, habitus (dorsal); B, idem (lateral right side); C, inner edge of basipod 1 of P4. Nota: One specimen had 5 spines on each basipod 1 of P4 and the other had 6 spines, but they were more heavily developped on the right side.

Male: D, habitus (dorsal); E, lateral right side of posterior of metasome.F, exopod of P1; G, P5.


Espèce Pseudochirella mawsoni - Planche 6 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.49]. As Pseudochirella notacantha.
Male (from 66°11'S, 65°10'E): a, habitus (lateral); b, forehead (lateral); c, left Md (manducatory plate).
Nota : Head and 1st thoracic somite fused, 4th and 5th fused !a line separating the 4th and 5th thoracic somites visible on the dorsal body surface). Proportional lengths of cephalothorax and urosome as 93 :30. Rostrum 1-pointed, directed downwards, apical portion hidden between the basal parts of A1. Frontal organ distinctly visible, with a pair of minute hairs. Posterolateral thoracic 5 border broadlly rounded, not produced, but armed with a minute, backwardly directed spine ; the spine is not placed exactly at the border, but a small distance from the margin (shape as in Gaetanus intermedius. Urosome 5-segmented ; somites and caudal rami proportional lengths 18 :28 :21 :18 :4 :11 = 100. Genital segment asymmetrical, with distinctly produced genital orifice at the left side. Ventral and dorsal borders of the 2nd-4th urosomal segments set with a row of small spinules. Caudal rami about as long as wide, densely haired along both margins. Md with manducatory plate much reduced in size, the cutting edge is very small and no distinct teeth


Espèce Pseudochirella mawsoni - Planche 7 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.50]. As Pseudochirella notacantha.
Male: a, P5 (lt = left leg; rt = right leg); b, posterior part cephalothorax and urosome (lateral, right side).


Espèce Pseudochirella mawsoni - Planche 8 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.51]. As Pseudochirella notacantha.
Male: a-b, left A1; c, right Mxp; d, left Mx1; e, right A2.
Nota: Endopod of A2 ¾ the length of the exopod.


Espèce Pseudochirella mawsoni - Planche 9 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Figs.52, 53]. As Pseudochirella notacantha.
Male:
Fig.52: a, right Mx2; b, forehead (dorsal); c, Md (mandibular palp).
Fig.: a, right P1 (anterior); b, left P2; c, right P3; d, left P4.


Espèce Pseudochirella mawsoni - Planche 10 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.44].
Female (from 61°44'S, 77°59'E): a, habitus (lateral); b, posterior part cephalothorax and urosome (lateral, right side); c, idem (lateral, left side).
Nota : Head and 1st thoracic somite partly fused, 4th and 5th separated (line of separation distinctly visible on the back but absent on the sides. Proportional lengths of cephalothorax and urosome as 22 :5. Urosome notably short. Rostrum curved , almost completely hidden between the basal portions of A1, 1-pointed with an acute apex ; Frontal organ (a pair of small hairs) visible laterally. 5th thoracic somite notably small, laterally visible as a slender strip along a part of the 4th, broadly rounded and carries a patch of fine, long hairs along its distal border. Urosome 4-segmented ; proportional lengths with the caudal rami : 40:22:20:8:10 = 100. Genital somite of very characteristic shape.


Espèce Pseudochirella mawsoni - Planche 11 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.45].
Female: a, posterior part cephalothorax and urosome (dorsal); b-c, left A1; d, forehead (lateral).
Nota: A1 24-segmented (8th and 9th segments fused, 24th and 25th segments almost fully separate).


Espèce Pseudochirella mawsoni - Planche 12 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.46].
Female: a, left A2; b, Md (cutting edge); c, Md (mandibular palp); d, left Mx2.
Nota: Endopod of A2 half the length of the exopod.


Espèce Pseudochirella mawsoni - Planche 13 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.47].
Female: a, left Mx1; b, habitus (dorsal); c, left Mxp.
Nota: . Mx1 with 1st inner lobe carrying 9 strong, setiform spines, in addition there are 4 smaller spines on the anterior surface of the lobe and 1 spine on its posterior surface, the lobe is slightly haired distally ; 1st outer lobe with 9 setae (7 of which very long, strong and plumose), the more basal 2 setae delicate and nude ; 2nd inner lobes with 4 setae and 1 appendicular seta, the distal border haired ; 3rd inner lobe with 4 setae. 2nd basal segment with near the apex 4 strong setae and 1 smaller appendicular seta ; exopod very small, with 11 setae ; endopod 3-segmented (segments indistinctly separate (arrangement of the setae 4 + 1 appendicular, 3+ 1 appendicular, 5 + 2 appendicular, respectively).


Espèce Pseudochirella mawsoni - Planche 14 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.48].
Female: a, right P1 (anterior); b-d, P2 to P4 (left legs).


Espèce Pseudochirella mawsoni - Planche 15 de figures morphologiquesissued from : G.D. Grice & K. Hulsemann in Pacif. Sci., 1968, 22 (3). [p.328, Figs.26-33]. As Pseudochirella tuberosa.
Female (from SE Pacific): 26, habitus (lateral); 27, forehead (dorsal); 28, posterior end of thorax and urosome (dorsal); 29, idem (lateral, left side); 30, idem (ventrolateral, right side); 31, genital segment (lateral, right side)32, A2; 33, P4 (exopod missing).


Espèce Pseudochirella mawsoni - Planche 16 de figures morphologiquesIssued from : E.L. Markhaseva in USSR Acad. Sci., Zool. Inst., Explor. Fauna Seas. Marine Plankton, 1989, 41 (49).
p.53, Fig.21].
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 rounded.
4 - Thoracic posterior corners symmetrical.
5 - Genital segment with protuberance on the right.
6 - Protuberance present in posterior part of genital segment.


Espèce Pseudochirella mawsoni - Planche 17 de figures morphologiquesPseudochirella mawsoni Male:
1 - Exopodite 2 of left P5 with tooth in its distal part.
2 - Exopodite 2 of left P5 with 2 teeth distally.
3 - Posterior corners of last thoracic segment with spines on both sides.
4 - Exopodite 3 of left P5 2 times longer than wide.


Espèce Pseudochirella mawsoni - Planche 18 de figures morphologiquesIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.82]. Caractéristiques morphologiques de Pseudochirella mawsoni femelle et mâle adultes.
Terminologie et abbréviations: voir à Calanus propinquus.

Ref. compl.:
Björnberg, 1973 (p.324, 386); Hopkins, 1985 (p.197, Table 1, gut contents); Razouls & al., 2000 (p.343, tab. 3, Appendix); Park & Ferrari, 2009 (p.143, Table 3, fig.1, Appendix 1, biogeography)
NZ: 5

Carte de distribution de Pseudochirella mawsoni par zones géographiques
Loc:
Antarct. (Croker Passage, Peninsula, Weddell Sea, SW & SE Atlant., Indian, SW & SE Pacif.), sub-Antarct. (SW Atlant., Indian, SW & SE Pacif.), off Juan Fernandez Is., S Chile, New Zealand, S Pacif., S Indian.

Type locality: Antarctic.
N: 10
Lg.:
(20) F: 6,75-5,91; M: 5,66-5,25; (25) F: 5,83; M: 5,56; (37) F: 6,75-5,42; M: 5,66-5,2; (201) F: 5,8; M: 5,3; {F: 5,42-6,75; M: 5,20-5,66}
Rem.: mésopélagique.
Sampling depth (Antarct., sub-Antarct.) : 0-1000+ m.
Voir aussi les remarques en anglais
Dernière mise à jour : 24/01/2017

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2020. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 01 décembre 2020]

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