Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Oithona ( Genus )
Oithona cruralis  Tanaka, 1977   (F)
Ref.:
in Nishida & al., 1977 (p.132, Descr.F, figs.F, Rem.)
Species Oithona cruralis - Plate 1 of morphological figuresIssued from : S. Nishida, O. Tanaka & M. Omori in Bull. Plankton Soc. Japan, 1977, 24 (2). [p.133, Fig.6].
Female (from Suruga Bay and adjacent waters): a, habitus (dorsal), b, forehead (lateral); c, 5th thoracic segment (lateral); d, caudal rami; e, Md; f, Mx1; g, P1; h, P2; i, P3; j, P4.

Nota: Prosome length /urosome length = 1.22.
Prosome 2.4 times as long as wide.
A2 measured 0.81 mm in lenth, extending to the end of urosomal segment 4.
Basipod 2 of Md with 2 spines, endopod with 3 setae.
Mx1 with a seta twice as long as endopod.

Nota: Setae formula of exopod P1 to P4 (outer setae in first, inner setae in second). P1: 1,1,2; 1,1,4. P2: 1,1,2; 1,1,5. P3: 1,1,1; 1,1,5. P4: 1,1,1; 0,1,5
basipod 1 of P2-P4 without inner seta.
Prosome length/urosome length = 1.22.

NZ: 1

Distribution map of Oithona cruralis by geographical zones
Loc:
Japan (Suruga Bay)
N: 1
Lg.:
(155) F: 0,97-0,83; {F: 0,83-0,97}
Rem.: This species closely resembles Oithona plumifera, however, the setae formulae of P2-P4 are different.
Last update : 24/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 28, 2022]

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