Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Clausocalanoidea ( Superfamille )
        Aetideidae ( Famille )
            Gaetanus ( Genre )
Gaetanus simplex  Brodsky, 1950   (F,M)
Syn.: Gaetanus intermedius Campbell, 1930 (p.178, figs.F); Brodsky, 1950 (1967) (p.165, figs.F); Park, 1973 (p.1597, figs.F,M); Coyle & al., 1990 (p.763); Hattori, 1991 (tab.1, Appendix); Razouls & al., 2000 (Appendix); Hernandez- Trujillo & Esqueda-Escarcega, 2002 (in Appendix); Park, W & al., 2004 (p.464, tab.1); Kosobokova & al., 2007 (p.929: Tab.7); Andronov, 2014 (p.36, fig.: A2);
Gaetanus campbellae Park, 1975 a (p.12, 13)
Gaetanus armiger : Davis, 1949 (p.28, figs.F)
Ref.:
Brodsky, 1950 (1967) (p.164, figs.F,M); Vervoort, 1963 b (p.129-130: Rem.); Vaupel-Klein, 1970 (p.13, figs.F,M); Morris, 1970 (p.2300, 2304, Rem.); Minoda, 1971 (p.24); Park, 1975 a (p.10); Bradford & Jillett, 1980 (p.48: Rem.); Markhaseva, 1996 (p.196, figs.F,M, Rem.)
Espèce Gaetanus simplex - Planche 1 de figures morphologiquesissued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.199, Fig.156].
Female (from Kuril Trench); Male (idem). Ce: forehead (lateral).


Espèce Gaetanus simplex - Planche 2 de figures morphologiquesissued from J.C. von Vaupel-Klein in Zool. Verh. Leiden, 1970, 110. [p.14, Fig.3].
Female (from NE Pacific: Station \"P\"); a-c, dorsal view of the last thoracic somite and urosome of three specimens; d-f, forehead (right lateral view of three specimens)


Espèce Gaetanus simplex - Planche 3 de figures morphologiquesIssued from : J.C. von Vaupel-Klein in Zool. Verh. Leiden, 1970, 110. [p.16, Fig.4, a-e];
Male: a, last thoracic segment and urosome (dorsal, specimen 1); b, idem (specimen 2); c, serrated caudal margin of the 2nd thoracic somite; d, forehead (specimen 1, lateral view); e, idem (specimen 2).
Nota: The caudal margins of the urosomal somites, with exception of the genital somite, are minutely serrated; In the female the caudal margins of the genital, as well as of the 2nd and 3rd urosomal somites, are serrated, but much less distinctly.


Espèce Gaetanus simplex - Planche 4 de figures morphologiquesIssued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.165, Fig.77].
Female (from NW Pacif.): habitus (dorsal and lateral right side); forehead (lateral); urosome (ventral); S1, P1; S5B1, distal inner margin of basipodal segment 1 of P4.

male: S2, P5.


Espèce Gaetanus simplex - Planche 5 de figures morphologiquesissued from : T. Park in J. Fish. Res. Board Can., 1973, 30. [p.1598, Fig.1]. As Gaetanus intermedius.
Female (from Washington Sound): A-B, habitus (dorsal and lateral, respectively); C, forehead (lateral); D, rostrum); E, A1; F, A2; G, Md; H, Mx1; I, Mx2.
Nota: Proportional lengths of prosome and urosome about 81:19. Forehead with a small cephalic spine. Frontal eminence bearing suprafrontal sensilla small. Rostrum simple, with a minutely bifurcated tip. 1st metasomal segment and cephalosome fused, Th4 and Th5 fused. Posterolateral corner of metasome with a spiniform process, extending a little beyond middle of genital segment; A1 reaching to about distal end of genital segment. 2nd exopodal segment of A2 with a large internal process carrying 1 seta. basis of Md with 2 subequal setae. Mx1 with 14 setae on 1st, 4 each on 2nd and 3rd inner lobes, 5 on basis; 14 on endopod; 11 on exopod; 9 on outer lobe. Coxa of Mxp without a lamelliform outgrowth.


Espèce Gaetanus simplex - Planche 6 de figures morphologiquesGaetanus simplex 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 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 2-segmented, or indistinctly 3-segmented.


Espèce Gaetanus simplex - Planche 7 de figures morphologiquesGaetanus simplex 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 is in anterior part of cephalon dorsally (lateral view), well visible.
4 - Spines on last thoracic segment long, longer than half length of genital segment.


Espèce Gaetanus simplex - Planche 8 de figures morphologiquesIssued from : V.N. Andronov in Russian Acad. Sci. P.P. Shirshov Inst. Oceanol. Atlantic Branch, Kaliningrad, 2014. [p.36, Fig.9, 5]. As Gaetanus intermedius after Park, 1973.
2, distal segment of exopod of A2.

Ref. compl.:
Björnberg, 1973 (p.324, 386); Peterson & Miller, 1976 (p.14, Table 1, 3, abundance vs interannual variations); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Peterson & Miller, 1977 (p.717, Table 1, seasonal occurrence); Hernandez-Trujillo, 1991 (1993) (tab.I); Bragina, 1999 (p.195); Yamaguchi & al., 2002 (p.1007, tab.1); Yamaguchi & al., 2004 (p.479, tab.2); Sedova & Grigoriev, 2005 (p.112); Gaard & al., 2008 (p.59, Table 1, N Mid-Atlantic Ridge); Galbraith, 2009 (pers. comm.); Homma & Yamaguchi, 2010 (p.965, Table 2); Homma & al., 2011 (p.29, Table 2, 4, 5, abundance, feeding pattern: suspension feeders); Abe & al., 2012 (p.100, temporal & vertical changes, gut content); Takenaka & al., 2012 (p.1669, Table 1, bioluminescence assay); Ohashi & al., 2013 (p.44, Table 1, Rem.); Coyle & al., 2014 (p.97, table 3)
NZ: 7

Carte de distribution de Gaetanus simplex par zones géographiques
Loc:
off Bermuda: Station "S" (32°10'N, 64°30'W) (in Deevey & Brooks, 1977), off S Iceland, Japan Sea, Japan (off Sanriku, off E Hokkaido), Station Knot, Okhotsk Sea, Kuril-Kamchatka, off SE Kuril Is., S Aleutian Is., S Bering Sea, S Aleutian Basin, Aleutian Trench, station "P", G. of Alaska (Auke Bay, Icy Strait), Pacif. (central sub-Arct.), British Columbia, Strait of Georgia, Washington Sound, Oregon (off newport), W Baja California, S Peru (in Björnberg, 1973).

Type locality: Pacific (NW part).
N: 30
Lg.:
(22) F: 3,2; M: 3,1; (37) F: 3,5-3,2; M: 3,1-2,65; (92) F: 3,47-3,15; (205) F: 3,5; M: 3,4; (208) F: 3,64-3,5; M: 3,55; {F: 3,15-3,64; M: 2,65-3,55}
Rem.: épi-abyssopélagique.
La signalisation de cette espèce en antarctique par Hopkins (1985, p.167) et Hopkins & Torres (1988, p.82, tab.2) dans la mer de Weddell) est probablement une confusion avec Gaidius intermedius Wolfenden,1905 = Gaetanus brevispinus (Sars,1900) et probablement aussi pour Rau & al., 1991 (p.1, fig.1);
Voir aussi les remarques en anglais
Dernière mise à jour : 15/02/2019

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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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