Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Oithona ( Genus )
Oithona dissimilis  Lindberg, 1940   (F,M)
Syn.: Oithona dissimilis oceanica Lindberg, 1947;
O. hebes : Wellershaus, 1969 (p.276, figs.F,M)
Ref.:
Lindberg, 1940 (p.519, Descr.F,M, figs.F); Sewell, 1948 (p.430); Lindberg, 1955 a (p.467: Rem.); Gonzalez & Bowman, 1965 (p.270, Rem.); Ferrari, 1977 (p.400, Redescr., figs.F, M, Rem.); Nishida, 1985 (p.138, 141); 1985 a (p.142, 143); Chihara & Murano, 1997 (p.937, Pl.198,202: F,M); McKinnon, 2000 (p.108, Rem.)
Species Oithona dissimilis - Plate 1 of morphological figuresissued from : F.D. Ferrari in Proc. Biol. Soc. Washington, 1977, 90 (2). [p.401, Fig.1]. From Tutuila Island, American Samoa.
Female: A, habitus (lateral left side); B, idem (dorsal); C, urosome (ventrolateral left side).
Nota: Metasome segments 1-4 each with a pair of dorsal sensory hairs, (segmet 2 with 2 pairs). Excluding terminal spine, exopod of P1-P4 with 1-1-3, 1-1-3, 1-1-3, 1-1-2 external spines, respectively; 1-1-4, 1-1-5, 1-1-5, 1-1-5 internal setae, respectively. Endopod P1-P4 with 0-0-1, 0-0-1, 0-0-1, 0-0-1 external setae, respectively and 1-1-5, 1-2-5, 1-2-5, 1-2-4 internal setae, respectively.

Male: D, habitus (dorsal); E, idem (ventrolateral right side); F, detail of cephalosome (ventrolateral); G, urosome (ventrolateral left side).
Nota: Prosome laterally with a very complex group of integumental organs in an area comprising posteroventral part of cephalosome and posterior extension or flap of cephalosome overlapping following segment.


Species Oithona dissimilis - Plate 2 of morphological figuresissued from : F.D. Ferrari in Proc. Biol. Soc. Washington, 1977, 90 (2). [p.403, Fig.2]. From Tutuila Island, American Samoa.
Female: A, caudal ramus (ventral); B, Md.

Male: C, Md; D, caudal ramus (ventral); E, A1.


Species Oithona dissimilis - Plate 3 of morphological figuresissued from : F.D. Ferrari in Proc. Biol. Soc. Washington, 1977, 90 (2). [p.405, Fig.3]. From Tutuila Island, American Samoa.
Female: A, Mx2; B, P4 (anterior).
Nota: Three large spines of Mx2 with notch on 2/3 dorsal margin.


Species Oithona dissimilis - Plate 4 of morphological figuresIssued from : S. Wellershaus in Veröff. Inst. Meeresforsch. Bremerh., 1969, 11 (2). [p.277, Fig.88-102]. As Oithona hebes.
Female (from Cochin Backwater, S. India): 88, habitus with ovisacs (dorsal); 90, urosome (ventral); 93, A1 (one terminal seta deformed); 96, A2; 97, Md; 99, P1; 100, P2; 101, exopod of P3; 102, P4 (in endopod onlly the specialized setae fully drawn).
Nota: Eye blue. 5th thoracic segment without hairs on theposterior margin. Caudal rami longer than the 5th thoracic segment; length: breadth = 2.50-2.88. Proportions of the urosomal segments 12, 33, 14, 14, 13; caudal rami 14 %/

Male: 89, habitus (dorsal); 91, urosome (dorsal); 92, urosome (juvenil; dorsal); 94, A1 (sheath not dotted; n = notch; aesthetasc on the end); 95, A2; 98, Md.
Nota: A1 twice geniculated; the proximal geniculation is surrounded by a sheathdistal geniculation with a notch in the segment. Proportions of the urosomal segments: 19, 19, 16, 13, 10, 11; caudal rami 13 %.
Scale : single line = 0.1 mm ; double line = 0.05 mm.


Species Oithona dissimilis - Plate 5 of morphological figuresissued from : K. Lindberg in Rec. Indian Mus., 1940, 42 (2). [p.520, Fig.2].
Female (from Oupalom pond, Pondichery): a, anal segment and caudal rami (dorsal); b, 5th thoracic segment and genital segment (ventral); c, A1; d, A2; e, endopod of P4; f, forehead (ventral).
Nota: Ratio lenths cephalothorax: urosome1.17-1.66:1. Forehead without rostrum, as a bilobated mass ventrally. Genital segment slightly longer than the posterior two segments combined; 2nd to 4th abdominal segments following from length slightly equal. Caudal rami strongly diverging, inner margin without hairs. A1 16-segmented, but sutures between 8th and 9th segments, and 13th and 14th more or less distinct, reaching the middle or posterior margin of the 4th thoracic segment. Exopod 3 of P4 about 2 times the length of the endopod 3. Ovisacs large, comprising each 10 to 22 eggs.


Species Oithona dissimilis - Plate 6 of morphological figuresissued from : K. Lindberg in Rec. Indian Mus., 1940, 42 (2). [p.522].
Dimensions from two females I and II.
Longueur = length; Largeur = wide; queue = urosome ; externe = outer; interne = inner; mediane = medial. Soie = seta; Furca = Caudal rami; Cinquième patte = P5.

Compl. Ref.:
Lo & al., 2004 (p.468, tab.2); Ohtsuka & al., 2008 (p.115, Table 5); Maiphae & Sa-ardrit, 2011 (p.641, Table 2, 3, Rem.); Saitoh & al., 2011 (p.85, Table 4, 5); Ueda & al., 2011 (p.2069, size vs salinity, speciation)
NZ: 4

Distribution map of Oithona dissimilis by geographical zones
Species Oithona dissimilis - Distribution map 2Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.143, Fig.94].
Indo-Pacific gepgraphical distribution of Oithona dissimilis.
Loc:
India (Pondichery, Cochin), G. of Thailand, China Seas (East China Sea), Taiwan (Tapong Bay), Japan, Samoa Is., Palau Is.
N: 8
Lg.:
(172) F: 0,61-0,67; M: 0,58; (279) F: 0,650-0,579; M: 0,57; (635) F: 0,7-0,61; M: 0,72-0,64; {F: 0,58-0,70; M: 0,57-0,72}
Rem.: brackish (Salinity 4 and 32 p.1000), estuaries, coastal.
Ferrari (1977,p.404) points to Lindberg's (1940) description overlooked an external spine on exopod 3 of P1, corrected it (1947) concerning the variety O. dissimilis oceanica in the pelagic waters of the open sea.
See in Oithona robertsoni Table 1 from McKinnon (2000, p.108).
Last update : 27/03/2014
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