Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Pseudodiaptomidae ( Family )
            Pseudodiaptomus ( Genus )
Pseudodiaptomus sewelli  Walter, 1984   (F,M)
Syn.: Pseudodiaptomus aurivilli : Sewell, 1932 (p.240); Wellershaus, 1969 (p.254, figs.F,M); Pillai, 1980 (p.248)
Ref.:
Walter, 1984 (p.383, figs.M; Rem.); 1986 (p.133); 1986 a (p.503); 1987 (p.367)
Species Pseudodiaptomus sewelli - Plate 1 of morphological figuresissued from : T.C. Walter in Proc. Biol . Soc. Wash., 1984, 97 (2). [p.384, Fig.6].
Male (from Cochin Backwater, India): A, P5 (posterior view); B, idem (anterior view).


Species Pseudodiaptomus sewelli - Plate 2 of morphological figuresIssued from : S. Wellershaus in Veröff. Inst. Meeresforsch. Bremerh., 1969, 11 (2). [p.255, Fig.21-22]. As Pseudodiaptomus aurivilli.
Female (from Cochin Backwater, India): 22, P5.
Nota: Exopodal segment 1 of P5 bears only one hair on the outer margin. Ratio cephalothorax: urosome = 1,7; Length of the caudal rami = 7 x breadth.

Male: 21, P5.
Nota: Proportions of the urosomal segments 11 : 20 : 18.5 : 18.5 : 9, caudal rami 23 %. The spine of the outer corner of the 5th thoracic segment is shorter than in the female. As in the female there is a pair of black dots in the anal segment. Spikes are on the whole posterior margin of abdominal 2, 3 and 4, and additional spinules on the ventral aspect of abdominal 2, 3 and 4
Scale : single line = 0.1 mm ; double line = 0.05 mm.


Species Pseudodiaptomus sewelli - Plate 3 of morphological figuresIssued from : S. Wellershaus in Veröff. Inst. Meeresforsch. Bremerh., 1969, 11 (2). [p.257, Table 2].
Comparative list of characters for Pseudodiaptomus aurivilli female (from Cochin Backwater, India) (= Pseudodiaptomus sewelli Walter, 1964) and Pseudodiaptomus aurivilli Cleve, 1901 (from Java Sea)


Species Pseudodiaptomus sewelli - Plate 4 of morphological figuresIssued from : S. Wellershaus in Veröff. Inst. Meeresforsch. Bremerh., 1969, 11 (2). [p.255]. As Pseudodiaptomus aurivilli.
Female (from Cochin Backwater, India): Proportion of the abdominal segments and length of the caudal setae (in % of abdomen length).

Nota: Ratio thorax : abdomen = 1.7.

Compl. Ref.:
Madhupratap & Haridas, 1986 (p.105, tab.2); Tiwari & Nair, 1993 (p.67); Ramaiah & al., 1996 (p.2); Ramaiah & Nair, 1997 (tab.1); Achuthankutty & al., 1998 (p.1, Table 2, fig.5, seasonal abundance vs monsoon); Maiphae & Sa-ardrit, 2011 (p.641, Table 2, 3, Rem.)
NZ: 1

Distribution map of Pseudodiaptomus sewelli by geographical zones
Species Pseudodiaptomus sewelli - Distribution map 2issued from : C.T. Achuthankutty, N. Ramaiah & G. Padmavati in Pelagic biogeography ICoPB II. Proc. 2nd Intern. Conf. Final report of SCOR/IOC working group 93, 9-14 July 1995. Workshop Report No. 142, Unesco, 1998. [p.8, Fig.6].
Salinity ranges for P. sewelli in coastal and estuarine waters of Goa (India).
Shaded area indicates the range of higher abundance.
Species Pseudodiaptomus sewelli - Distribution map 3issued from : C.T. Achuthankutty, N. Ramaiah & G. Padmavati in Pelagic biogeography ICoPB II. Proc. 2nd Intern. Conf. Final report of SCOR/IOC working group 93, 9-14 July 1995. Workshop Report No. 142, Unesco, 1998. [p.6, Fig.5].
Monthly occurrence of Pseudodiaptomus sewelli in coastal (black circle) in front of Goa and and the Mandovi estuary (clear circle).
Species Pseudodiaptomus sewelli - Distribution map 4issued from : C.T. Achuthankutty, N. Ramaiah & G. Padmavati in Pelagic biogeography ICoPB II. Proc. 2nd Intern. Conf. Final report of SCOR/IOC working group 93, 9-14 July 1995. Workshop Report No. 142, Unesco, 1998. [p.3, Fig.2].
Hydrography of the coastal station in front of Goa and Mandovi estuarine station (W India).

Nota: The seasons are arbitrarily classified into the southwest monsoon (June-September), postmonsoon (October-January) and premonsoon (February-May).
Loc:
India (Bombay, Goa, Bengal, Cochin, Burhabalanga estuary), Andaman Sea
N: 8
Lg.:
(172) F: 1,26; M: 0,94; (802) F: 1,26; M: 0,94; {F: 1,26; M: 0,94}
Rem.: estuary-neritic.
Incomplete data.
In Hyalinus species group (trihamatus subgroup) after Walter & al. 2006, p.203.
Wellershaus (1969, p.256), in the Cochin Backwater, found the species in waters between 4 and 30 p.1000 salinity.
Last update : 18/12/2017
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