Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Metridinidae ( Famille )
        Gaussia ( Genre )
Gaussia sewelli  Saraswathy, 1973   (F,M)
Syn.: Metridia scotti : Sewell, 1913 (p.354);
Gaussia princeps : Sewell, 1932 (p.270, fig.F,M, Juv.); 1947 (p.173); Brodsky, 1950 (1967) (part., p.312, figs. Ind. Oc: F,M, non figs. NP: F,M, Rem.); ? Tanaka & Omori, 1967 (p.251); Grice & Hulseman, 1967; Saraswathy, 1971
Ref.:
Saraswathy, 1973 a (p.192, figs.F,M); Björnberg & Campaner, 1988 (p.351, Rem.); Padmavati & al., 1998 (p.347); Soh & al., 1998 (p.172, figs.F,M, fig.7: carte, Rem.); Suarez-Morales, 2007 (40, tabl.2, 3); Stephen ( Data sheets of NIO, Kochi, India (on line, Diagnostic characteristics, figs.F,M).
Espèce Gaussia sewelli - Planche 1 de figures morphologiquesIssued from : R.B.S. Sewell in Mem. Indian Mus., 1932, X (continued). [P;.V]. As Gaussia princeps.
Female (from N Indian Ocean): 1, habitus (dorsal); 2, A1; 3, A2; 4, P1; 5, P2; 6, P3; 7, P4.


Espèce Gaussia sewelli - Planche 2 de figures morphologiquesIssued from : R.B.S. Sewell in Mem. Indian Mus., 1932, X (continued). [P;.VI]. As Gaussia princeps.
Male: 1, habitus (dorsal); 2, right A1; 4, P5.

Female: 3, Mxp; 4, P5; 5,


Espèce Gaussia sewelli - Planche 3 de figures morphologiquesIssued from : R.B.S. Sewell in Mem. Indian Mus., 1932, X (continued). [p.271, Fig.92]. As Gaussia princeps.
Female (from Laccadive Sea): habitus, dorsal (arrangement of the cutaneous pores).


Espèce Gaussia sewelli - Planche 4 de figures morphologiquesIssued from : R.B.S. Sewell in Mem. Indian Mus., 1932, X (continued). [p.276, Fig.93, a]. As Gaussia princeps.
Female: a, urosome (lateral left side).


Espèce Gaussia sewelli - Planche 5 de figures morphologiquesissued from : H.Y. Soh, S. Ohtsuka, H. Imabayashi & S. Sawamoto inSpecies Diversity, 1998, 3. [p.178, Fig.5 G].
Female (from the Indian Ocean): G, distal seta on 3rd exopodal segment of rigt P5.


Espèce Gaussia sewelli - Planche 6 de figures morphologiquesissued from : H.Y. Soh, S. Ohtsuka, H. Imabayashi & S. Sawamoto inSpecies Diversity, 1998, 3. [p.180, Fig.6 H].
Male (from the Indian Ocean): H, P5 (posterior; distal two exopodal segments of right leg torted).


Espèce Gaussia sewelli - Planche 7 de figures morphologiquesissued from : R. Stephen, 2007 [Data sheets of NIO, Kochi, India (on line)]. After M. Saraswathy, 1973.
Female (from Arabian Sea and Bay of Bengal): a, last thoracic segment and urosome (dorsal).

Male: c, last thoracic segment and urosome (lateral).
Nota: Posterolateral corners of last thoracic segment: Backwardly directed hardly divergent spines.
Genital segment: Symmetrical lateral inflations.
Caudal rami distal protuberance: Barely evident.


Espèce Gaussia sewelli - Planche 8 de figures morphologiquesissued from : M. Saraswathy in Handbook to the Intern. zoopl. Coll., Cochin-18, Kerala State, India, 1973. [p.193, Figs.4, 5].
Female (from Indian Ocean): 4, P5.

Male: 5, P5.


Espèce Gaussia sewelli - Planche 9 de figures morphologiquesissued from : M. Saraswathy & J.M. Bradford in N. Z. Jl mar. freshw. Res., 1980, 14 (1). [p.80, Fig.1].
Male: right A1.
Positions of various integumental structures indicated. A, ventral view; B, dorsal view of proximal part; A, aesthetasc; P, pore; Pr, pits with radiating ridges; Se, seta; Sq, suat appendage.


Espèce Gaussia sewelli - Planche 10 de figures morphologiquesissued from : M. Saraswathy & J.M. Bradford in N. Z. Jl mar. freshw. Res., 1980, 14 (1). [p.81, Fig.2].
SEM details of male right A1: A, segment 16 showing aesthetasc (A) and associated pit with radiating pores (x825); B, pit with radiating ridges (x4650); C, segment 11 showing the squat appendage (x860).
Nota: Pits with radiating ridges: These are on the ventral surface, always at the base of an aesthetasc, in the female and the male. The floor of the pit appears to be raised towards the centre and is almost covered in a radial pattern apparently by extensions of the surronding integuments.
Squat appendage on male segment 11: This is on the anterodistal corner of segment 11 of the right A1 and ends in separate hemisperical and cone-shaped protuberances without pores or other external structures. It is apparently articulated with its segment and appears to be a modified seta judging from its position relative to the aesthetasc. This structure was found on all adult males of G. sewelli and G. scotti (= G. princeps).

Ref. compl.:
Madhupratap & Haridas, 1986 (p.105, tab.1); Kazmi, 2004 (p.228, as swelli, Rem.: p.232)
NZ: 1 + 1 douteuse

Carte de distribution de Gaussia sewelli par zones géographiques
Espèce Gaussia sewelli - Carte de distribution 2issued from : H.Y. Soh, S. Ohtsuka, H. Imabayashi & S. Sawamoto inSpecies Diversity, 1998, 3. [p.182, Fig.7].
Zoogeographical distribution of Gaussia princeps, G. sewelli and G.asymmetrica
Espèce Gaussia sewelli - Carte de distribution 3issued from : M. Saraswathy in Handbook to the Intern. zoopl. Coll., Cochin-18, Kerala State, India, 1973. [p.193].
Localities from G. scotti (= G. princeps) (black circle) and G. sewelli (white circle) obtained.
Loc:
N Indian (Arabian Sea, Bay of Bengal), ? Japan
N: 3
Lg.:
(44) F: 9,5-9; M: 9,5-8; (94) F: 9,9-9,4; M: 9,6-8,4; {F: 9,00-9,90; M: 8,00-9,60}

The mean female size is 9.450 mm (n = 4; SD = 0.3697), and the mean male size is 8.875 mm (n = 4; SD = 0.7974). The size ratio (male : female) is 0.94..
Rem.: Un doute subsiste sur l’identification faite par Tanaka & Omori (1967) si l’on admet G. sewelli.
Voir aussi les remarques en anglais
Dernière mise à jour : 13/02/2016

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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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