Species Card of Copepod
Calanoida ( Order )
    Epacteriscoidea ( Superfamily )
        Ridgewayiidae ( Family )
            Placocalanus ( Genus )
Placocalanus longicauda  Ohtsuka, Fosshagen & Soh, 1996   (F,M)
Ohtsuka & al., 1996 (p.248, figs.F,M)
Species Placocalanus longicauda - Plate 1 of morphological figuresissued from : S. Ohtsuka , A. Fosshagen & H.Y. Soh in Sarsia, 1996, 81. [p.249, Fig.1].
Female (from Nagannu Is., Okinawa): A, habitus (dorsal); B, idem (lateral right side); C, prosome (lateral right side, anvil-like basal process of P1 indicated by large arrow, round coxal process by small arrow); D, genital double-somite (dorsolateral, seminal receptacle arrowed); E, rostrum; F, labrum and A2; G, basal setae of A2; H, Md (mandibular gnathobase); I, Md (mandibular palp).
Scales in mm. Holotype: A, B, D-F, H, I; paratype: C, G.

Species Placocalanus longicauda - Plate 2 of morphological figuresissued from : S. Ohtsuka , A. Fosshagen & H.Y. Soh in Sarsia, 1996, 81. [p.251, Fig.2].
Female: A, A1 (posterior surface); B, Mx1 (praecoxal arthrite and coxal endite); C, Mx1 (coxa, basis and rami); D, Mx2; E, Mxp (three elements on 3rd syncoxal endite missing); F, P1 (anterior surface; anvil-like basal process arrowed); G, P1 (basis and endopod, anvil-like basal process arrowed); H, P2 (anterior surface); I, P3 (posterior surface); J, exopod of P3 (anterior surface; scar of middle spine arrowed); K, P4 (anterior surface); L, P5 (anterior surface).
Scales in mm. Holotype: A-C, E-L; paratype: D.

Species Placocalanus longicauda - Plate 3 of morphological figuresissued from : S. Ohtsuka , A. Fosshagen & H.Y. Soh in Sarsia, 1996, 81. [p.252, Fig.3].
Male: A, habitus (lateral right side); B, right A1 (anterior surface; segment XXV arrowed); C, right P5 (anterior surface); D, left P5 (anterior surface); E, left P5 (2nd and 3rd exopod segments, minute seta arrowed; anterior surface).
Scales in mm.

Species Placocalanus longicauda - Plate 4 of morphological figuresissued from : S. Ohtsuka, A. Fosshagen & H.Y. Soh in Sarsia, 81. [p.253, Table 1].
Setation and spinulation of legs 1-4 of the three species of Placocalanus females.
Bold letters mean differences between species.

NZ: 2

Distribution map of Placocalanus longicauda by geographical zones
S Japan (Nagannu Island, Okinawa)
N: 1
(514) F: 0,48; 0,46; M: 0,44; {F: 0,46-0,48; M: 0,44}
Rem.: hyperbenthic (depth: 47-53 m). Sandy bottom.
Last update : 24/03/2015
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 Any use of this site for a publication will be mentioned with the following reference :

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 July 01, 2022]

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Marine Planktonic Copepods

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