Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Gaetanus ( Genre )
Gaetanus armiger  Giesbrecht, 1888   (F,M)
Syn.: Aetidius armiger : T. Scott, 1894 b (p.71);
? G. atlanticus Wolfenden, 1904 (p.132); Jespersen, 1934 (p.61, Rem.);
no G. armiger : Davis, 1949 (p.28, figs.F); Tanaka, 1969 (p.257, figs.M)
Ref.:
Giesbrecht, 1892 (p.219, 224, figs.F); Giesbrecht & Schmeil, 1898 (p.33); A. Scott, 1909 (p.45, figs.F, Rem.); Sars, 1925 (p.59, figs.F); Sewell, 1929 (p.101); Mori, 1937 (1964) (p.40, figs.F, Rem.); Lysholm & al., 1945 (p.16); Sewell, 1947 (p.56, 58); Vervoort, 1952 e (n°46, p.3, figs.F); Tanaka, 1957 b (p.172, figs.F); Vervoort, 1963 b (p.129, Rem.); Tanaka & Omori, 1970 (p.133); Morris, 1970 (p.2304: Rem.); Park, 1975 a (p.27, Descr.M, figs.F,M); Bradford & Jillett, 1980 (p.48); Roe, 1984 (p.357); Markhaseva, 1996 (p.180, figs.F,M); Chihara & Murano, 1997 (p.687, Pl.42,44: F,M); Vives & Shmeleva, 2007 (p.589, figs.F,M, Rem.)
Espèce Gaetanus armiger - Planche 1 de figures morphologiquesissued from : T. Park in Bull. Mar. Sci., 1975, 25 (1). [p.27, Fig.10].
Female: A, posterior part of metasome and urosome (lateral); B, forehead (lateral); C, rostrum (anterior); D, A2; E, coxa of Mxp; F, first leg (anterior); G, coxa of fourth leg (partial, posterior).


Espèce Gaetanus armiger - Planche 2 de figures morphologiquesissued from : T. Park in Bull. Mar. Sci., 1975, 25 (1). [p.28, Fig.11].
Male: A, B, habitus (dorsal and lateral, respectively); C, D, forehead (lateral, dorsal); E, F, last metasomal and genital segments (dorsal, lateral); G, A2; H, mandibular palp; I, Mx1; J, Mxp; K, P1; L, P2; M, P3; N, fifth pair of legs (posterior); O, last two exopodal segments of left fifth leg (medial). P1-3: legs (anterior).


Espèce Gaetanus armiger - Planche 3 de figures morphologiquesIssued from: G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XVIII, figs.1-2].
Female: 1, habitus (lateral left side); 2, posterior part cephalothorax.


Espèce Gaetanus armiger - Planche 4 de figures morphologiquesissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate VIII, Figs.16-22].
Female (from Indonesia-Malaysia): 16, habitus (dorsal); 17, forehead (lateral); 18, last thoracic and genital segments (left side); 19, rostrum; 20, Mxp (basal portion only); 21, P1: 22, P4 (basal portion only).
Nota: Apparent absence of the lamella on the basal segment of Mxp, as it is evidently vry small and will, therefore, be easily folded up.


Espèce Gaetanus armiger - Planche 5 de figures morphologiquesissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (2nd edit., 1964). [Pl.17, Figs.8-13].
Female: 8, P1; 9, habitus (dorsal); 10, P4 (posterior); 11, A2; 12, Mx2; 13, Mx1.


Espèce Gaetanus armiger - Planche 6 de figures morphologiquesissued from : C.C. Davis in Univ. Wash. Publs Biol., 1949, 14. [Pl.3, Figs.30-32].
Female (from NE Pacific): 30, forehead (lateral); 31, last thoracic segment and urosome (lateral); 32, 1st basal segment of Mxp.

Nota : Frontal spine small and turned downwards nearly parallel to the front. Rostrum small, consists of but a single point. A1 24-segmented, extending about to the genital segment. Head and 1st thoracc segment fused, 4th and 5th segments fused. Soines on the posterior corners of prosome about ¾ the length of the genital segment. Urosomal sents 2, 3 and anal of about equal lengths ; genital segment about as long as the 2nd and 3rd segments combined. Mxp without trace of a lamella or protrusion on the 1st basal segment.


Espèce Gaetanus armiger - Planche 7 de figures morphologiquesIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 14 , Figs.19, 20 ].
Female: 19, A2 (anterior view); 20, Md (mandibular palp; posterior view).


Espèce Gaetanus armiger - Planche 8 de figures morphologiquesIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 14, Fig.26 ].
Female: 26, Md (cutting edge).


Espèce Gaetanus armiger - Planche 9 de figures morphologiquesIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 14, Figs.22, 23, 28, 29 ].
Female: 22, P2 (posterior view); 23, exopod 3 of P4 (posterior view); 28, P1 (anterior view); 29, basipod 1 of P4.


Espèce Gaetanus armiger - Planche 10 de figures morphologiquesIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. – Fauna Flora Golf. Neapel, 1892. Atlas von 54 Tafeln. [Taf. 36 , Figs.2, 4, 5].
Female: 2, habitus (lateral); 4, urosome (ventral); 5, forehead (lateral).


Espèce Gaetanus armiger - Planche 11 de figures morphologiquesGaetanus armiger female:
1 - Anterior part of cephalon with frontal spine.
2 - Exopodal segment 1 of A2 without seta; exopodal segment 2 with 2 setae (1 medial situated on conic protrusion and 1 distal). 2nd internal lobe of Mx1 with 4 setae. Exopod of P1 always with 2 external spines.
3 - Mxp protopodite without lateral plate.
4 - Exopod of P1 evidently 3-segmented.


Espèce Gaetanus armiger - Planche 12 de figures morphologiquesGaetanus armiger male:
1 - Cephalon with frontal spine.
2 - Exopodal segment 3 of left P5 prolonged, stylet-like, never bilobated. It is always longer than exopodal segment 2.
3 - Frontal spine removed from anterior part of cephalon dorsally (lateral view), poorly visible.


Espèce Gaetanus armiger - Planche 13 de figures morphologiquesissued from : Tanaka O. in Publ. Seto Mar. Biol. Lab., 1957, 6 (2). [p.172, Fig.42, a-d].
Female (from Sagami): a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment and genital segment (lareral); d, exopodite of P1.

Nota Female:
- Cephalothorax about 3.49 times the abdomen length (2.62 : 0.75).
- Cephalic spine slender and short, directing forwards.
- Rostrum small.
- Last thoracic segment with lateral spines divergent, and extend beyond the middle of genital segment.
- Articulation between 4th and 5th thoracic segments slightly visible in dorsal view.
- Abdomen 4-segmented; segments and caudal rami with proportional lengths 52 : 22 : 19 : 15 : 22 = 100.
- Genital segment as long as wide.
- Caudal rami about 1.2 times aés long as wide.
- A1 23-segmented.
- A2 exopod 1.2 times as long as endopod..
- Mxp without lamellous process on the distal margin of 1st basal segment..
- Terminal spine of exopod of P2 to P4 with 18, 18 and 27 teeth respectively.
- P4 bears 17 spines on inner margin of coxa at the base of inner marginal seta.


Espèce Gaetanus armiger - Planche 14 de figures morphologiquesissued from : Tanaka O. in Publ. Seto Mar. Biol. Lab., 1957, 6 (2). [p.172].
Female A1: proportional lengths of segments.
- A1 23-segmented, extends to distal end of 3rd abdominal segment; segments 24-25 are 1.05 times as long as segment 19; according to Giesbrecht, segments 22 and 23 of equal lengths, but in the present specimenn segment 22 is 1.1 times as long as the 23rd.

Ref. compl.:
Cleve, 1904 a (p.191); Pearson, 1906 (p.14); Wilson, 1942 a (p.187); Sewell, 1948 (p.347, 499, 516, 519, 520, 545, 556, 566); ? C.B. Wilson, 1950 (p.229); Chiba & al., 1957 (p.308); Minoda, 1958 (p.253, Table 1, 2, abundance); Fagetti, 1962 (p.18); Furuhashi, 1966 a (p.295, vertical distribution in Oyashio/Kuroshio transitional area, Table 7, 10); Grice & Hulsemann, 1967 (p.15); Shih & al., 1971 (p.143); Roe, 1972 (p.302, 308); Deevey & Brooks, 1977 (p.256, Table 2, station "S"); Vives, 1982 (p.291); Roe, 1984 (p.357); Madhupratap & Haridas, 1986 (p.105, tab.1); Lozano Soldevilla & al., 1988 (p.58); Park & Choi, 1997 (Appendix); Suarez-Morales & Gasca, 1998 a (p108); Lapernat, 2000 (tabl.3, 4); Holmes, 2001 (p.48); Fernandes, 2008 (p.465, Tabl.2 as arminger); Galbraith, 2009 (pers. comm.); C.E. Morales & al., 2010 (p.158, Table 1); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Hirai & al., 2013 (p.1, Table I, molecular marker)
NZ: 16

Carte de distribution de Gaetanus armiger par zones géographiques
Loc:
South Africa, Atlant. (tropical), G. of Guinea, off NW Cape Verde Is., off NW Canary Is., off W Cabo Finisterre, off Azores, G. of Mexico, Sargasso Sea, off Bermuda: Station "S" (32°10'N, 64°30'W), ? S Davis Strait, Norwegian Sea, Faroe Is., Iceland, off W Ireland, North Sea, Indian, off E Sri Lanka, Bay of Bengal, Indonesia-Malaysia, China Seas (East China Sea), S Korea, Japan (Izu), ? Bering Sea, Pacif. (NE & SW), off Vancouver Is., off California, W Baja California, Hawaii, off Malpelo Is., off Galapagos, off Peru, off Chile (., Concepcion).

Type locality: Pacific (equatorial).
N: 46
Lg.:
(1) F: 3; (5) F: 3,5; (14) F: 3,05-2,95; (37) F: 4,7-2,7; M: 3,16-2,6; (40) F: 3,6-2,72; M: 3,16-2,6; (46) F: 3,2; ? (49) F: 4,7-4,5; (56) F: 3,37; (57) F: 2,6; (59) F: 4,7-3; (113) F: 3,2; (199) F: 3,12; (866) M: 3,1; {F: 2,60-4,70; M: 2,60-3,16}
Rem.: épi-bathypélagique-?.
La synonymie de G. atlanticus avec cette espèce comme celle de Aetidius armiger in T. Scott (1894 b), est en question par Vervoort (1963 b).
D'après Morris (1970), certaines confusions ont été possibles entre cette espèce et Gaetanus simplex.
Pour Park (1975, p.36) cette espèce citée au nord du Pacifique Nord est discutable du fait d'une confusion possible avec G. campbellae (= G. intermedius)
Voir aussi les remarques en anglais
Dernière mise à jour : 11/04/2017

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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2020. - Diversité et répartition géographique chez les Copépodes planctoniques marins. Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 28 septembre 2020]

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