Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Oithona ( Genus )
Oithona hamata  Rosendorn, 1917   (F)
Ref.:
Rosendorn, 1917 (p.302); 1917 a (p.15, figs.F); Kiefer, 1929 g (p.5, Rem.F); Sewell, 1948 (p.430); Lindberg, 1955 a (p.465: Rem.); Wellershaus, 1970 (p.484, Rem.F); Kos, 1972 (Vol.I, figs.F, Rem.); Shuvalov, 1980 (p.101, figs.F); Nishida, 1985 a (p.49, Redescr.F, figs.F, p.132); Yoo & Lim, 1993 (p.91, 94, 97, Table 1); Bradford-Grieve & al., 1999 (p.886, 966, figs.F); Vives & Shmeleva, 2010 (p.59, figs.F,M, Rem.)
Species Oithona hamata - Plate 1 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.50, Fig.23].
Female (from off SE Sri Lanka): a, habitus (dorsal); b, forehead (lateral); c, anal segment and caudal rami (dorsal); d, A1; e, A2; f, Md; g, Md (biting edge).


Species Oithona hamata - Plate 2 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.51, Fig.24].
Female: a, thoracic segment 5 and genital segment partial (lateral left side); b, Mx1; c, Mx2; d, Mxp; e, P1; f, P2; g, P3; h, P4.


Species Oithona hamata - Plate 3 of morphological figuresissued from : I. Rosendorn in Wiss. Ergebn. dt. Tiefsee-Exped. \"Valdiviella\", 1917, 23. [p.15, Fig.5].
Female: a, habitus (dorsal); b, forehead (dorsal); c, urosomal segments 1 and 2; d, forehead (lateral); e, Md (mandibular palp); f, Mx1.

Nota: Proportion of lengths (p.cent) Prosome : 50.9, Urosome : 49.1. Relative lengths of urosomal segments and caudal rami8 : 8: 16: 9: 9: 7: 7.


Species Oithona hamata - Plate 4 of morphological figuresissued from : I. Rosendorn in Wiss. Ergebn. dt. Tiefsee-Exped. \"Valdiviella\", 1917, 23. [p.16, Fig.6].
Female: a, P1; b, P2; c, P3; d, P4.
Nota: Setal formula of the exopod swimming legs P1 to P4 (Se = outer setae ; Si = inner setae), P1 : 1, 1, 2 Se ; 0, 1, 4 Si ; P2 : 1, 0, 2 Se ; 0, 1, 5 Si ; P3 : 1, 0, 1 Se ; 0, 1, 5 Si ; P4 : 0, 0, 1 Se ; 0, 1, 5 Si .


Species Oithona hamata - Plate 5 of morphological figures issued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.102, Fig.17].
Female: 1-2, habitus (dorsal); ahm, A1; 3, habitus (lateral); 4, same; 5-6, forehead (dorsal); 7, same (another specimen); 8-9, thoracic segments 4 and 5, genital segment (dorsal and lateral, respectively); 10, postrior part of urosome.


Species Oithona hamata - Plate 6 of morphological figuresMorphological characters of Oithona hamata female :
1 - Anterior part of prosome produced into pointed rostrum in dorsal view.
2 - Exopod 3rd segment of P1 with 2 outer marginal spines.
3 - Number of setae in exopod of Md more than 3, and prosome length than 3.0 times of prosome width.
4 - Outer marginal spine in exopod 3rd segment of P4 curved smoothly.
5 - Endopod of Md with 4 setae, genital segment ventrally without tuft of hairs.

Compl. Ref.:
Grice & Hart, 1962 (p.287, table 3, p.293: Rem.); Björnberg, 1973 (p.356, 388); Kovalev & Shmeleva, 1982 (p.85); Greze & al., 1985 (p.8); Yoo, 1991 (tab.1); Siokou-Frangou, 1999 (p.478); Uysal & al., 2002 (p.18, tab.1); Uysal & Shmeleva, 2012 (p.909, Table I)
NZ: 7

Distribution map of Oithona hamata by geographical zones
Species Oithona hamata - Distribution map 3Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.132, Fig.81].
Indo-Pacific geographical distribution of Oithona hamata.
Loc:
Atlant. (equatorial), G. of Guinea, off Amazon, off Cape Cod, off SE New York, Medit. (Alboran Sea, W Basin, G. of Saronikos, Lebanon Basin), Arabian Gulf, Indian (equatorial), China Seas (Yellow Sea), S Korea (Cheju Is.), Pacif. (tropical), Chile (in Björnberg, 1973)
N: 10
Lg.:
(627) F: 1,35-1,29; (649) F: 1,06; (880) F: 1,06-1,1; {F: 1,06-1,35}
Rem.: epiplagic.
For Nishida (1985, p.49) the specimens agree with Rosendorn's (1917) description except for the presence of inner marginal seta on exopodal segment 1 of P1-P4 in the former. The species is distinguished from closely allied O. tenuis by the shape of rostrum and the absence of inner marginal seta on the basal segment of A2.
Last update : 28/11/2019
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