Species Card of Copepod
Monstrilloida ( Order )
    Monstrillidae ( Family )
        Cymbasoma ( Genus )
Cymbasoma tropicum  (Wolfenden, 1905)   (F,M)
Syn.: Thaumaleus tropicus Wolfenden, 1905 (1906) (p.1025, figs.F); Cymbasoma nicobarica Sewell, 1949 (p.142, figs.M); Silas, 1972 (p.639); Cymbasoma tropica : Martin Thompson & Easterson, 1983 (p.176, figs.F,M, Rem.)
Sewell, 1949 (p.142, 144: Rem.); Desai & Krishnaswamy, 1962 (p.163, 165); Grygier, 1995 a (p.31, 51, 77, Rem.)
Species Cymbasoma tropicum - Plate 1 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, IX (2), 1949. [p.143, Fig.40 A-D]. As Cymbasoma nicobarica.
Male (Nankauri Harbour, Nicobar Is.): A, habitus (dorsal); B, urosome (ventral); C, A1; D, exopod of P4.
Nota: Anterior border of the head rounded, with a pair of minute hairs or projections spring from the surface between the origins of A1. A pair of well-developed and deeply pigmented eyes. Genital segment oval in shape. Caudal rami widely divergent, each bears 4 setae, of which 3 arise from the distal end, while the 4th arises from a low rounded swemming on the posterior and inner margin, directed backwards. A1 about one-third of the body-length, 5-segmented (the line of separation of the 2nd and 3rd segments apparently incomplete; proportional lengths of the various segments as 15:22:12:26:25 = 100; there is a distinct hinge-joint between the 4th and 5th segments.

NZ: 1

Distribution map of Cymbasoma tropicum by geographical zones
Maldive Is., Bombay, Nicobar Is., Nankauri Harbour
N: 3
(78) F: 2; (662) M: 1,5; (782) F: 2,18-1,8; M: 1,44-1,22; {F: 1,80-2,18; M: 1,22-1,50}
Rem.: in surface tow-net.
According to Sewell (1949, p.144) it is possible that this is the unknown male of Wolfenden's species Cymbasoma tropicus, but it is impssible to reach any conclusion on this point.
Last update : 02/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed September 27, 2022]

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Marine Planktonic Copepods

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