Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Phaennidae ( Family )
            Xanthocalanus ( Genus )
Xanthocalanus dilatus  Grice, 1962   (F,M)
Grice, 1962 (p.203, Descr.F, figs.F); Guangshan & Honglin, 1984 (p.135, Descr.M, figs.M)
Species Xanthocalanus dilatus - Plate 1 of morphological figuresissued from : Guangshan & Honglin, 1984.
Female: 15, 16, habitus (dorsal, lateral); 17, P5; 20, B1 and B2 of P3.
Male: 18, 19, habitus (dorsal, lateral); 21, P5 (left); 22, P5 (right).

Species Xanthocalanus dilatus - Plate 2 of morphological figuresissued from : G.D. Grice in Fish. Bull. Fish and Wildl. Ser., 1962, 61. [p.204, Pl.15, Figs.2-11].
Female (from 00°16'N, 140°12'W): 2-3, habitus (dorsal and lateral, respectively); 4, rostrum; 5, Mx1; 6, terminal part of Mx2; 7, P1; 8, P2; 9, P3; 10, P4 (distal two segments of exopod missing); 11, P5.
Figs.2-6 and 11 of holotype; figs.7-10 of paratype.
Head and 1st thoracic segment separate, 4th and 5th separate.
Posterior lateral margins of the 1st thoracic segment distended and there is a distinct dilatation on the dorsal surface of the head.
Rostrum straight and club-like;
2nd segment of endopod of A2 with 14 setae on the distal margin (8 on the inner lobe and 6 on the outer lobe); exopod with 6 setae but some may be missing from the various segments.
Md with 3 setae on the basipod; 11 setae on the endopod and 6 on the exopod.
Mx1: 9 setae on the external lobe, 7 on the exopod, 9 on the endopod, 5 on the 2nd basal segment, 2 on the 2nd internal lobe and 3 on the 3rd internal lobe.
Terminal part of Mx2 with 6 sensory organs and 1 worm-like appendage.

Compl. Ref.:
Campaner, 1978 a (p.968); Bradford & al., 1983 (p.71); Shih & Young, 1995 (p.71); Williamson & McGowan, 2010 (p.273, Table III, Pacific central gyres: N & S)
NZ: 2

Distribution map of Xanthocalanus dilatus by geographical zones
Pacif. (N equatorial), Pacif. (W equatorial), Pacific (central gyres: N & S), China Seas (South China Sea)
N: 4
(101) F: 1,6; 1,56; (952) F: 1,5; M:1,4; {F: 1,50-1,60; M: 1,40}
Rem.: epi-mesopelagic.
Last update : 02/02/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed September 30, 2023]

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Marine Planktonic Copepods

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