Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Heterorhabdidae ( Family )
            Hemirhabdus ( Genus )
Hemirhabdus amplus  Park, 2000   (F,M)
Park, 2000 (p.55, figs.F,M, Rem.)
Species Hemirhabdus amplus - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 2000, 31. [p.185, Fig.33].
Female (from 31°12'N, 119°17'W): a, urosome (left side); b, urosome with genital somite somewhat inflated by deep telescoping of the following somite (left); c, urosome (dorsal); d, genital somite (ventral); e, right Mxp (anterior).
Nota: Coxa of Mxp with 1+2 setae (Fig.33-e). Genital somite in dorsal view with nearly straight lateral margins (Fig.33-c) and in ventral view with the genital operculum close to anterior end of somite (Fig.33-d.

Male: f, g, P5 (anterior, posterior, respectively); h, distal end of exopod of left P5 (anterior); i, j, second exopodal segment of right P5 (posterior, anterior, respectively).
Nota: 2nd exopodal segment of right P5 with elongate mefial projection (Fig.33-i).

NZ: 4

Distribution map of Hemirhabdus amplus by geographical zones
off San Diego, E Pacif. (tropical N-S), off W Austral Islands, Corail Sea, SW Indian, Madagascar.

Type locality : 31°12' N, 119°17 'W.
N: 1
(824) F: 11,83-10,5; M: 11,16-10,66; {F: 10,50-11,83; M: 10,66-11,16}
Rem.: Park (2000, p.56) notes when the two species H. grimaldii and H. amplus co-occurred in samples, this latter was always the larger (mainly the females).
This species differs from that of H. grimaldii by the genital somite having rather straight lateral margin, a depth about equal to the length, and a genital operculum close to its anterior end. The Mxp with the coxa, normally has o,ly 2 distal setae and 3 large pores on the anterior surface and the endopod normally has only 1 pore anteriorly. The male can be distinguished from that of H. grimaldii by the terminal spine of the left exopod, which is relatively short and tapers to a sharp spine, and by the fingerlike medial projection of the 2nd segment of the right exopod.
Last update : 12/10/2017
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 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 20, 2024]

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Marine Planktonic Copepods

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