Species Card of Copepod
Cyclopoida ( Order )
    Oncaeidae ( Family )
        Oncaea ( Genus )
Oncaea tregoubovi  Shmeleva, 1968   (F,M)
Syn.: Oncaea sp. L (part.) Böttger-Schnack, 1988.
Shmeleva, 1968 (p.1784, figs.F,M); 1969 (p.13, figs.F,M); Malt, 1982 (p.185, Redescr.F, figs.F); Böttger-Schnack, 1990 a (p.476, 478, 480); Huys & Böttger-Schnack, 2007 (p.95, Redescr.F,M, figs.F,M, Table 2, 3, 4); Vives & Shmeleva, 2010 (p.323, figs.F,M, Rem.); Böttger-Schnack & Machida, 2011 (p.111, Table 1, 2, fig.2, DNA sequences, phylogeny)
Species Oncaea tregoubovi - Plate 1 of morphological figuresissued from : A.A. Shmeleva in Bull. Inst. océanogr. Monaco, 1969, 68, n° 1393. [p.14, Fig.10].
Female (from S Adriatic Sea): a, habitus (dorsal); b, urosome (dorsal); c, A1; d, A2; f-i, P1 to P4.

Species Oncaea tregoubovi - Plate 2 of morphological figuresissued from : A.A. Shmeleva in Bull. Inst. océanogr. Monaco, 1969, 68, n° 1393. [p.11, Fig.3].
Male: a, habitus (dorsal); b, urosome (dorsal); c, A1; d, A2; e, Mxp; f-h, P1 to P3; i, endopod of P4.

Species Oncaea tregoubovi - Plate 3 of morphological figuresIssued from : S.J. Malt in Bull. Br. Mus. nat. Hist. (Zool), 1982, 42 (3). [p.195, Fig.1].
Female (from 20°N, 21°W): a, habitus (dorsal); b, urosome (dorsal); c, A1; d, A2; e, Md; f, Mx1; g, Mx2; h, Mxp; i, P5.

Female : Ratio of prosome : urosome 1.8 : 1.
- 3rd prosomal segment without a dorsal projection.
- Head (1st prosomal division) 1.3 times longer than wide.
- Proportional lengths of urosome and caudal rami 8 : 57 : 5 : 4 : 13 : 13.
- Genital apparatus located on dorsal surface anterior to midpoint of genital segment ; each area armed with a setule.
- Caudal rami twice as long as wide.
- A1 6-segmented ; ratio of segment lengths 10 : 13 : 46 : 13 : 8 : 10.
- A2 3-segmented ; 1st segment bearing 1 long pinnate seta distally ; 2nd segment bearing a row of denticles along internal surface ; terminal segment longer than 2 nd and bearing 5 curved spines and 2 curved setae.
- Md bearing 5 elements : a stout seta on external surface, 2 broad blades, 1 long and hirsute, the other small and unarmed.
- Mx1 bilobed ; bearing1 seta on internal surface ; 2 setae on internal lobe and 2 setae, a setose seta and a spine on external lobe.
- Mx2 2-segmented ; 2nd segment produced distally as an elongate, curved, bilaterally spinulose claw ; also having an external pinnate seta and an internal bilaterally spinulose element.
- Mxp 4-segmented ; 1st segment unarmed ; internal surface of 2nd segment with 2 spines, distal spine bidentate ; 3rd segment reduced ; terminal segment produced as a long claw and armed with a row of setules on concave surface, an internal basal spine and an external basal setule.
- P5 comprising a small cylindrical segment bearing a single terminal seta on body surface near leg.

Species Oncaea tregoubovi - Plate 4 of morphological figuresIssued from : S.J. Malt in Bull. Br. Mus. nat. Hist. (Zool), 1982, 42 (3). [p.196, Fig.2].
Female: a, P1; b, P2 (damaged); c, P3; d, P4.

Nota : External spines of exopodites bilaterally serrate. Terminal spines of exopodites longer than terminal segments bearing them but terminal spines of endopodites shorter than terminal segments ; each terminal ; spine borderede by a serrate membrane unilaterally ; endopodites of P1-P3 terminate in conical projections ; all setae on legs plumose.

Species Oncaea tregoubovi - Plate 5 of morphological figuresIssued from : S.J. Malt in Bull. Br. Mus. nat. Hist. (Zool), 1982, 42 (3). [p.166].
Female: Armature of the swimming legs P1 to P4.

Compl. Ref.:
Kovalev & Shmeleva, 1982 (p.86); Böttger-Schnack & al., 1989 (p.1089) ; Böttger-Schnack, 1992 (p.304); 1994 (p.277); 1995 (p.92); 1997 (p.409); Hure & Krsinic, 1998 (p.104); Krsinic, 1998 (p.1051); Böttger-Schnack & al., 2001 (p.1029, tab.1, 2); Krsinic & Grbec, 2002 (p.127, tab.1); Nishibe & al., 2009 (p.491, Table 1: seasonal abundance); Böttger-Schnack & Schnack, 2009 (p.131, Table 3, 4); Uysal & Shmeleva, 2012 (p.909, Table I)
NZ: 6

Distribution map of Oncaea tregoubovi by geographical zones
off N Cape Verde Is., Medit. (Alboran Sea, Balearic Basin, S Adriatic Sea, South of Crete, Lebanon Basin), G. of Aqaba, Red Sea (N-S), Gulf of Aden, Equatorial Indian Ocean, Japan (Tosa Bay), Oyashio region, NE Pacific (off Monterey, California)
N: 16
(680) F: 0,37-0,31; (685) F: 0,33; M: 0,33; (788) F: 0,31-0,28; M: 0,3-0,29; (1011) F: 0,33 [N Red Sea]; 0,34-0,36 [G. of Aqaba]; 0,37 [Adriatic Sea]; 0,32-0,33 [Equatorial Indian Ocean]; 0,35-0,36 [NW Pacific, Kuroshio extension]; 0,38-0,40 [NW Pacif., Oyashio region]; 0,36 [off Monterey, California]; M: 0,31-0,34 [S-N Red Sea]; {F: 0,28-0,40; M: 0,29-0,34}
Rem.: This species shows very variable bathymetric situations (200-400 m in the Adriatic Sea, 0-450 m in the Red Sea, 200-300 m in the Adriatic Sea, and 2980-3560 m in NE Cape verde Is.
For Malt (1982, p.186) some minor differences were found between the present material (NE Cape Verde Is.) and the original material figured by Shmeleva (1968). Most notably Shmeleva (fig.9) shows P4 with the internal margin of the 3rd endopodal segment unarmed, whereas the present specimens have a single seta
Last update : 22/12/2016
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed June 12, 2021]

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Marine Planktonic Copepods

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