Species Card of Copepod
Platycopioida ( Order )
    Platycopiidae ( Family )
        Platycopia ( Genus )
Platycopia compacta  Ohtsuka, Soh & Ueda, 1998   (F, juv.M)
Ohtsuka & al., 1998 (p.416, figs.F, juv.M, fig.7: chart)
Species Platycopia compacta - Plate 1 of morphological figuresissued from : S. Ohtsuka, H.Y. Soh & H. Ueda in Zool. Sc., 1998, 15; [p.417, Fig.1].
Female (from Kuchino Is., S Japan): A, habitus (dorsal); B, idem (lateral left side, intermaxillipedal process arrowed); C, rostrum; D, urosome (ventral, gonopores arrowed); E, anal somite and caudal rami (dorsal); F, intermaxillipedal process (ventral view).
Scale bars in mm.
Nota: Cephalosome and 1st pedigerous somite incompletely fused, 4th and 5th separate. Rostrum without filaments at tip. Urosome 5-segmented. Genital somite small (almost concealed beneath dorsal extension of 5th pedigerous somite, paired llit-like gonopores (arrowed in fig.1D). 1st to 3rd abdominal somites with postero margin finely striated; 3rd abdominal somite protruded dorsoposteriorly into w-shaped plate covering anus; 4th abdominal somite prominent ventroposteriorly. Caudal rami symmetrical, each with triangular dorsal process.

Species Platycopia compacta - Plate 2 of morphological figures issued from : S. Ohtsuka, H.Y. Soh & H. Ueda in Zool. Sc., 1998, 15; [p.418, Fig.2].
Female: A, A1; B, A2; C, Md (mandibular cutting edge); D, Md (mandibular palp); E, Mx1 (basal exite arrowed); F, Mx2.
Scale bars in mm.
A1 23-segmented. A2 with unarmed coxa and basis; endopod with 1st segment completely fused to basis (allobasis), 2nd and 3rd segments incompletely coalesced with 3 and 7 setae, respectively; exopod indistinctly 7-segmented (setal formula: 1, 0, 1, 1, 2, 1, 4). Cutting edge of Md with 1 monocusped tooth and 4 bisusped teeth; mandibular palp with unarmed basis, endopod 1-segmented with 7 terminal setae, exopod 4-segmented, with 0, 2, 1, 2 setae, respectively. Mx1 well developed; praecoxal arthrite with 6 stout, multicusped spines and 6 setae (2 setae of which being originated from center of anterior surface); coxal endite with 3 setae; basal exite (arrowed in fig.2E) lobate with 2 setae of unequal length; proximal basal endite with 3 terminal spinulose setae; distal basal endite probably represented by a knob with 2 unequal setae; both rami completely incorporated into basis, with 4 setae. Mx2 stout, 2 praecoxal, 2 coxal and 1 basal endites with 4, 1, 3, 3, 3 setae, respectively, 1 seta each on 2nd coxal endite and on basal endite fused to segment; 1st endopod segment completely fused to basis (represented by 1 spiniform seta); 2nd to 4th segments with 1 spiniform seta, 3rd and 4th segments with 1 and 2 setae, respectively, in aaddition to spiniform seta.

Species Platycopia compacta - Plate 3 of morphological figuresissued from : S. Ohtsuka, H.Y. Soh & H. Ueda in Zool. Sc., 1998, 15; [p.419, Fig.3].
Female: A, Mxp; B, P1 (anterior); C, P2 (anterior).
Scale bars in mm.
Nota: Mxp with praecoxa and coxa incompletely coalesced; coxa with 2 spinulose, subterminal setae; basis with 2 inner setae (one of them being rudimentary); endopod 6-segmented (setal formula: 1, 2, 2, 1, 1, 4); intermaxillipedal process (in fig.1B,F) with 3 pairs of anteriorly directed, acute prominences at tip.

Species Platycopia compacta - Plate 4 of morphological figuresissued from : S. Ohtsuka, H.Y. Soh & H. Ueda in Zool. Sc., 1998, 15; [p.420, Fig.4].
Female: A, P3 (anterior); B, P4 (anterior); C, P5 (anterior).
Scale bar in mm.

Species Platycopia compacta - Plate 5 of morphological figuresissued from : S. Ohtsuka, H.Y. Soh & H. Ueda in Zool. Sc., 1998, 15; [p.422, Fig.6].
Male (copepodid stage V): B, A1 (1st segment): E, P5.
Scale bars in mm.

Compl. Ref.:
Ohtsuka & Nishida, 2017 (p.567)
NZ: 1

Distribution map of Platycopia compacta by geographical zones
Species Platycopia compacta - Distribution map 2
Chart of 1996
Species Platycopia compacta - Distribution map 3issued from : S. Ohtsuka, H.Y. Soh & H. Ueda in Zool. Sc., 1998, 15; [p.423, Fig.7].
Distribution of several species of the genus Platycopia. 1, P. compacta; 2, P. orientalis; 3, P. perplexa & pygmaea (Sars); 4, P. perplexa; 5, P. robusta; 6, P. sarsi & tumidila (M.S. Wilson); 7, P. inornata.
S Japan (Nansei Islands: Kyushu S: Kuchino Island: )
N: 1
(768) F: 0,81; 0,76; {F: 0,76-0,81}
Rem.: epibenthic (depth: 67 m).
After Ohtsuka & al. (1998), the platycopioids, based on their circumglobal distribution, suggested that it exhibit a Tethyan track.
Last update : 10/05/2019
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed June 24, 2024]

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