Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Oithona ( Genus )
Oithona pseudofrigida  Rosendorn, 1917   (F)
Syn.: Oithona frigida pseudofrigida Rosendorn, 1917 (p.302); 1917 a (p.19, figs.F, Rem.); Wellershaus, 1970 (p.482); Owre & Foyo, 1967 (p.107, figs.F, Rem.); Shuvalov, 1980 (p.107, figs.F); Vives, 1982 (p.295); Fabré Navarette, 1986 (p.32); O. frigida : Pavlova, 1966 (p.44); Kovalev & Shmeleva, 1982 (p.85); Razouls & Durand, 1991 (p.75)
Ref.:
Sewell, 1948 (p.431, 461); Vervoort, 1951 (p.149, Rem.); Nishida & al., 1977 (p.143, figs.F, Rem.); Björnberg & al., 1981 (p.663, 665, figs.F, Rem.); Nishida, 1985 a (p.72, figs.F, Rem.: p.133); Chihara & Murano, 1997 (p.938, Pl.196: F); Bradford-Grieve & al., 1999 (p.886, 966, figs.F); Conway & al., 2003 (p.203, figs.F,M, Rem.); Vives & Shmeleva, 2010 (p.70, figs.F, Rem.)
Species Oithona pseudofrigida - Plate 1 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.73, Fig.39].
Female: a, habitus (dorsal); b, forehead (lateral); c, A1; d, A2; e, Md; f, Md (biting edge); g, Mx1; h, P5 (ventral view).
Nota: Proportional lengths of urosome segments and caudal ramus 11:31:15:14:15:14.


Species Oithona pseudofrigida - Plate 2 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.74, Fig.40].
Female: a, thoracic segment 5 and genital segment (lateral left side); b, anal segment and caudal rami (dorsal); c, idem (ventral); d, Mx2; e, Mxp.


Species Oithona pseudofrigida - Plate 3 of morphological figuresIssued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.75, Fig.41].
Female: a, P1; b, P2; c, P3; d, P4.

Setal formula on outer margin (in first) and inner margin (in second) of exopod segments (from proximal to distal) of P1 to P4:
P1: 1, 1, 3; 1, 1, 4.
P2: 1, 1, 3; 1, 1, 5
P3: 1, 0, 1; 1, 1, 5.
P4: 0, 0, 1; 1, 1, 5.


Species Oithona pseudofrigida - Plate 4 of morphological figuresissued from : I. Rosendorn in Wiss. Ergebn. dt. Tiefsee-Exped. \"Valdiviella\", 1917, 23. [p.19, Fig.9].
Female : a, habitus (dorsal); b, forehead (lateral); c, Mx1; d, Md (mandibular palp); e, P1; f, P2; g, P3; h, P4.
Nota: Distal outer seta of exopod 3 of P4 short.


Species Oithona pseudofrigida - Plate 5 of morphological figuresissued from : H.B. Owre & M. Foyo in Fauna Caribaea, 1, Crustacea, 1: Copepoda. Copepods of the Florida Current. 1967. [p.107, Figs.781, 782, 783]. As. Oithona frigida var. pseudofrigida.
Female: 781, rostrum; 782, exopod of P1; 783, exopod of P4.

Nota: One female reported from the Florida Current, probably stage V. The specimen fits Rosendorn's description in detail except in the length of spines on P2 and 3, the latter being the one worthy of note. Rosendorn's illustration shows the lateral spines on exopod 3 of P3 about equal length, and Kiefer (1929) stated that the distal spine is short, no longer than the proximal one (in our specimen the distal spine is longer than the proximal one).


Species Oithona pseudofrigida - Plate 6 of morphological figuresIssued from : S. Nishida, O. Tanaka & M. Omori in Bull. Plankton Soc. Japan, 1977, 24 (2). [p.143, Fig.16].
Female (from Suruga Bay and adjacent waters): a, habitus (dorsal), b, forehead (lateral); c, Md; d, Mx1; e, P1; f, P2; g, P3; h, P4.

Nota: Setae formula of exopod P1 to P4 (outer setae in first, inner setae in second). P1: 1,1,3; 1,1,4. P2: 1,1,3; 1,1,5. P3: 1,0,1; 1,1,5. P4: 0,0,1; 1,1,5.
Prosome length/urosome length = 1.24-1.35.

Compl. Ref.:
Lozano Soldevilla & al., 1988 (p.61); Lan Y.-C. & al., 2008 (p.61, Table 1, % vs stations)
NZ: 8

Distribution map of Oithona pseudofrigida by geographical zones
Species Oithona pseudofrigida - Distribution map 3Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.133, Fig.83].
Indo-Pacific geographical distribution of Oithona pseudofrigida.
Species Oithona pseudofrigida - Distribution map 4issued from : I. Rosendorn in Wiss. Ergebn. dt. Tiefsee-Exped. \"Valdiviella\", 1917, 23. [Taf. I].
The genus Oithona: Distribution of species sampled during the Deutsche Tiefsee Expedition 1898-99.
The size of symbols indicates the relative quantitty of the species.
Loc:
South Africa, Namibia, Canary Is., off Morocco-Mauritania, off Cape Finisterre, Cuba, Brazil, Yucatan, Florida, Medit. (E Basin), W Indian, Indian, China Seas (East China Sea), NW Taiwan (25°30'N, 123°E), Japan
N: 10
Lg.:
(155) F: 1,24-1,07; (627) F: 1,25; 1,22; {F: 1,07-1,25}
Rem.: Mesopelagic.
The forms, cited as O. frigida from the subtropical Atlantic and the Mediterranean Sea are considered to belong to this species.
Nishida (1985, p.72) points to this species is distinguished from closely allied O. frigida by the presence of 1 inner marginal seta on the exopodal segment 1 of P2-P4, the short outer marginal spines on the exopodal segment 3 of P3-P4 and the presence of 2 rudimentary spinules on the outer margin of the exopodal segment 3 of P3.
See in DVP Conway & al., 2003 (version 1)
Last update : 18/05/2016
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed October 24, 2021]

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