Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Gaetanus ( Genre )
Gaetanus antarcticus  Wolfenden, 1905   (F,M)
Syn.: Gaetanus antarctica Wolfenden, 1905 a (p.7, Descr.F, fig.F),
no G. antarcticus Brady, 1918 (p.19);
Gaetanus brevicaudatus Wolfenden, 1911 (p.227, figs.F);
Gaetanus wolfendeni Park, 1975 a (p.12);
Gaidius robustus : Grice & Hulsemann, 1967 (p.24, figs.60-64: M)
Ref.:
Wolfenden, 1911 (p.229); Farran, 1929 (p.208, 233, Rem.: juv.); Sewell, 1947 (p.58, 65, figs.F, Rem.); Vervoort, 1957 (p.62, figs.F, Rem.); Tanaka & Omori, 1970 (p.131, figs. juv.M); Park, 1978 (p.141, figs.F); Bradford & Jillett, 1980 (p.48); Björnberg & al., 1981 (p.605, 630, figs.F); Markhaseva, 1996 (p.178, figs.F,M); Bradford-Grieve & al., 1999 (p.879, 922, figs.F,M)
Espèce Gaetanus antarcticus - Planche 1 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.142, Fig.26].
Female: A, habitus (dorsal view); B, idem (right lateral side); C, A2; D, Md; E, Mx1; F, Mx2.


Espèce Gaetanus antarcticus - Planche 2 de figures morphologiquesissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.143, Fig.21].
Female: A, Mxp; B, P1; C, P2; D, P4; E, medial part of coxa of P4 (posterior view); P1-4: swimming legs (anterior view).


Espèce Gaetanus antarcticus - Planche 3 de figures morphologiquesissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.179, Fig.138].
Female (specimen from Antarctic: Indian sector). Ce: forehead (lateral); CP4: coxopod of P4 (partial).


Espèce Gaetanus antarcticus - Planche 4 de figures morphologiquesissued from : G.D. Grice & K. Huisemann in Proc. U.S. Nat. Mus., 1967, 122 (3583). [p.51, Figs.60-64]; As Gaidius robustus.
Male (from Indian Ocean): 60, 5th thoracic segment and urosme (dorsal); 61, idem (lateral right side); 62, forehead (lateral); 63, P5; 64, distal end of left P5.


Espèce Gaetanus antarcticus - Planche 5 de figures morphologiquesissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.66, Fig.11].
Female (from Arabian Sea): A, habitus (leteral right side); B, A2; C, Mx1; D, basal segment of Mxp; E, P1; F, P4.

Nota: Proportional lengths of the prosome and urosome as 80 : 20.
- The proportional lengths of the urosome as : 37 : 19 : 17 : 11 :1 6 = 100.
- The genital and the two following segments are each prrovided with a row of spines (this row is composed of stout triangular spines across the dorsal aspect, but on the sides and below the size of the spines is much reduced.
- A1 24-segmented, segments 8 and 9 fused (in Wolfenden, 1905, p.7, there are 23 segments because segments 24 and 25 fused).
- In Mxp the lamella on the 1st basal segment is rounded at its distal end and is not produced in a hook-like process.
- In the swimming legs there are tufts of fine hairs on the anterior aspect of the distal segment of the endopod.
- Secretory glands are present on all three segments of the exopod of P2 to P4, and these open by pores situated close to the base of the marginal spine at the distal external angle.


Espèce Gaetanus antarcticus - Planche 6 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.42].
Female (from 61°44'S, 77°59'E):a-b, habitus (lateral and dorsal, respectively).


Espèce Gaetanus antarcticus - Planche 7 de figures morphologiquesissued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Report Ser. B, Vol. III., 1957 [Fig.43].
Female: a-b, posterior part cephalothorax and urosome (lateral and dorsal, respectively); c, forehead (lateral).)


Espèce Gaetanus antarcticus - Planche 8 de figures morphologiquesissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [p.227, Fig.15 a].
Female: a, habitus (lateral, left side).


Espèce Gaetanus antarcticus - Planche 9 de figures morphologiquesissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [p.227, Fig.15 b]. As Gaetanus brevicaudatus.
Female: b, basal segment of Mxp.


Espèce Gaetanus antarcticus - Planche 10 de figures morphologiquesissued from : R.N. Wolfenden in Die Marinen Copepoden der Deutschen Südpolar-Expedition 1901-1903, 1911. [Pl.XXVI, Figs.11-12]. As Gaetanus brevicaudatus.
Female: 11, last thoracic segment and urosome; 12, P1.


Espèce Gaetanus antarcticus - Planche 11 de figures morphologiquesissued from : R.N. Wolfenden in Plankton Studies Part I. Copepoda. 1905 [Pl.III, 1]. As Gaetanus antarctica.
Female: 1, habitus (lateral).


Espèce Gaetanus antarcticus - Planche 12 de figures morphologiquesGaetanus antarcticus female:
1 - Anterior part of cephalon with frontal spine.
2 - Exopodal segment 2 of A2 with 1 seta; exopodal segment 2 with 3 setae. 2nd internal lobe of Mx1 with 5 setae.
3 - Exopod of P1 clearly 3-segmented; with 3 external spines. Lateral plate of Mxp protopodite well developed.
4 - Spines of last thoracic segment curved and removed ventrally (lateral view).
5 - Frontal spine short.


Espèce Gaetanus antarcticus - Planche 13 de figures morphologiquesGaetanus antarcticus male:
1 - Cephalon with frontal spine.
2 - Exopodal segment 3 of left P5 bilobated. It is 1.5-2.2 shorter than exopodal segment 2.
3 - Spines on last thoracic segment, not reaching the posterior border of genital segment. Exopodal segment 3 of P5 bilobated with complete subdivision into lobes.


Espèce Gaetanus antarcticus - Planche 14 de figures morphologiquesIssued from : C. Razouls in Ann. Inst. océanogr., Paris, 1994, 70 (1). [p.71]. Caractéristiques morphologiques de Gaetanus antarcticus femelle adulte.
Terminologie et abbréviations: voir à Calanus propinquus.

Ref. compl.:
Hardy & Gunther, 1935 (1936) (p.159, Rem.: juv.); Sewell, 1948 (p.331, 532, 574); C.B. Wilson, 1950 (p.229); Grice & Hulsemann, 1967 (p.15); 1968 (tab.2); Björnberg, 1973 (p.323, 386); Arcos, 1976 (p.85, Rem.: p.93, Table II); Vives, 1982 (p.291); Hopkins, 1985 (p.197, Table 1, gut contents); Hopkins & Torres, 1988 (tab.1); Razouls & al., 2000 (p.343, tab. 5, Appendix); Schnack-Schiel & al., 2008 (p.1045: Tab.2); Galbraith, 2009 (pers. comm.); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography)
NZ: 10

Carte de distribution de Gaetanus antarcticus par zones géographiques
Espèce Gaetanus antarcticus - Carte de distribution 3issued from : W. Vervoort in B.A.N.Z. Antarctic Reseach Expedition, Reports - Ser. B, Vol. III, 1957 [Fig.41]
Chart showing the geographical distribution (white circle) in the seas surrounding the Antarctic continent.
Nota: In this chart the area frequented by whaling vessels has been hatched. The Antarctic circle (66°.5 S) has been drawn as a broken line. The numbers I to VI refer to the sectors into which the Antarctic seas are divided according to Mackintosh (1942) (after Vervoort, 1951).
Loc:
Antarct. (Croker Passage, Peninsula, Weddell Sea, SW Atlant., Indian, SW - S - SE Pacif., Mc Murdo), Magallones region (in Arcos, 1976, with doubt), sub-Antarct. (SE Pacif.), off E Trindade Is., Brazil, Argentina, off Morocco-Mauritania, Portugal, G. of Oman, Arabian Sea, Indian, ? Japan (Izu), Marquesas Is., Vancouver Is., off Juan Fernandez Is., Chile.

Type locality: 64°18'S, 90°27'E
N: 23
Lg.:
(10) F: 5,9; (10’) F: 8; (11) F: 8,25-7,6; (20) F: 9,08-7,91; (25) F: 8,78-8,4; (37) F: 9,08-7,6; (202) F: 8-8,48; {F: 5,90-9,08}
Rem.: méso & bathypélagique.
Sampling depth (Antarct., sub-Antarct.) : 600-1000+ m.
Les fortes différences de taille observées par Wolfenden (1911) correspondent aux localisations antarctique (10’) et atlantique S (10).
Cette espèce serait transportée de l'antarctique vers le nord par les courants intermédiaires ou profonds.
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 03 décembre 2020]

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