Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Pseudodiaptomidae ( Family )
            Pseudodiaptomus ( Genus )
Pseudodiaptomus ardjuna  Brehm, 1953   (F,M)
Syn.: no Pseudodiaptomus ardjuna : Wellershaus,1969 (p.259, fig. M)
Ummerkutty, 1960 (p.179, figs.F,M, Redescr.M); Alvarez & Kewalramani, 1970 (p.269, Descr.N, figs.N); Pillai, 1976 (1980) (p.260, figs.F,M); Dussart & Defaye, 1983 (p.34); Grindley, 1984 (p.219, fig.M); Nishida, 1985 (p.132); Walter, 1986 (p.133); 1986 a (p.503); 1987 (p.367); Dalal & Goswami, 2001 (p.22, fig.2); Ferrari & Dahms, 2007 (p.22, Rem. N); Al-Yamani & al., 2011 (p.50, figs.F,M)
Species Pseudodiaptomus ardjuna - Plate 1 of morphological figuresissued from : A.N.P. Ummerkutty in J. Mar. Biol. Ass. India, 1960, 1 (2). [p.182, Fig.1].
Female (G. of Mannar): 1, habitus (dorsal); 2, A1; 3, A2; 4, Md; 5, Mx1; 6, Mx2; 7, Mxp; 8, P1; 9, P2; 10, endopod of P4; 11, P5.
Nota: Head and 1st pediger segment fused; Th5 armed on each of its postrero-lateral corners with a sharp spine, directed backwards and slightly outwards, the right spine slightly larger than the left one.
A1 23-segmented; segments 1st to 15th and the 18th and 23rd segments bear each an aesthetask besides 1 or more setae, the 21st segment bears a specialized seta whose inner margin carries a row of teeth at about its mid-region.
A2 with a protopod 2-segmented, endopod 2-segmented and exopod 4-segmented; possessing 2 rows of small spinules on the distal inner margin of the last segment of the endopod.
Md palp with exopod 4-segmented, endopod 2-segmented and a 2-segmented protopod; masticatory blade with numerous teeth.
Mx1, probably the most conservative of all structures in this genus, quite typical.
Mx2 apparently 3-segmented, consists of 7 endites, the 1st and 2nd segments with 2 endites each, the 3rd with 3 endites; the endites bear 3 or 4 fairly long setae.
Mxp 7-segmented.
P5 uniramous, symmetrical, 4-segmented; 1st segment naked, 2nd and 3rd segments each bears 1 setule, the last segment with 2 setae of unequal length and 2 flattened spinelike structures, bearing minute teeth on the inner margin. Endopod absent.
A single ovisac, containing about 25 eggs.

Male: 12, habitus (dorsal); 13, right A1; 14, P5.
Nota: A1 21-segmented, right one geniculate, left A1 as in female including the specialized seta of the 21th segment.

Species Pseudodiaptomus ardjuna - Plate 2 of morphological figuresissued from : Y. Al-Yamani, V. Skryabin, A. Gubanova, S. khvorov & I. Prusova in Marine Zooplankton Practical Guide for the Northwestern Arabian Gulf, 2, 2011. [p.50, Fig.171].
Female (from Kuwait): a, habitus (lateral); b, genital double-somite.

Species Pseudodiaptomus ardjuna - Plate 3 of morphological figuresissued from : Y. Al-Yamani, V. Skryabin, A. Gubanova, S. khvorov & I. Prusova in Marine Zooplankton Practical Guide for the Northwestern Arabian Gulf, 2, 2011. [p.50, Fig.172].
Male: a, habitus (lateral); b, P5; c, right P5 terminal part.

Compl. Ref.:
Madhupratap & Haridas, 1986 (p.105, tab.2); Ramaiah & al., 1996 (p.3)
NZ: 1

Distribution map of Pseudodiaptomus ardjuna by geographical zones
India (Bombay coast, Palk Bay; probably along the West coast of India); Arabian Gulf (Kuwait)
N: 9
(1005) F: 1,20-1,23; M: 1,03-1,10; (1060) F: 1,31; (1085) F: 1,1-1,57; M: 1,08-1,32; {F: 1,10-1,57; M: 1,03-1,32}
Rem.: estuary-neritic.
Incomplete data.
In Ramosus species group (hickmani subgroup) after Walter & al. 2006, p.203.
See remarks in P. sulawesiensis (Nishida & Rumengan, 2005, p.31).
Last update : 18/12/2017
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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 May 20, 2024]

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