Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Arietellidae ( Family )
            Metacalanus ( Genus )
Metacalanus curvirostris  Ohtsuka, 1985   (F,M)
Ohtsuka, 1985 (p.299, figs.F,M); Chihara & Murano, 1997 (p.719, Pl.53: F,M)
Species Metacalanus curvirostris - Plate 1 of morphological figuresissued from : S. Ohtsuka in Publ. Seto Mar. Biol. Lab., 1985, 30 (4/6). [p.300, Fig.9].
Female (from Tanabe Bay, Honshu): A, habitus (lateral right side); B, idem (dorsal); C, rostrum; D, genital segment (showing seminal receptacle, ventral); E, left A1; F, right A1.

Male: G, right A1; H, left A1. All setae and aesthetascs of A1 omitted.

Nota: Head and 1st thoracic segment separate, 4th and 5th fused. A1 asymmetrical (right 19-segmented, 8th and 9th partly fused), left longer than the right one, 18-segmented (1st and 2nd, 8th and 9th segments partly fused). Urosome 4-segmented. Anal segment very small with a rounded operculum.

Species Metacalanus curvirostris - Plate 2 of morphological figuresissued from : S. Ohtsuka in Publ. Seto Mar. Biol. Lab., 1985, 30 (4/6). [p.301, Fig.10].
Female: A, A2; B, Md; C, Mx1; D, Mx2; E, Mxp.

Nota: Basipod of A2 with 1 anterior distal seta; endopod 2-segmented, proximal unarmed, distal segment with 2 setae of unequal lengths medially and 5 setae apically; exopod 6-segmented, 2nd and 5th segments each with 1 seta, terminal segment with 1 medial seta and 2 terminal setae. Endopod of Md wanting; exopod 5-segmented, proximal four segments with 1 seta, terminal segment with 2 setae of unequal lengths. Mx1 rudimentary, 1st inner lobe bearing numerous fine hairs, 2nd inner lobe small with 1 minute seta apically; outer lobe with 5 plumose setae; endopod wanting; exopod armed with 3 plumose setae apically. Mx2 strongly developed, basal segments with 6 inner lobes, 1st with 1 plumose seta and 4 or 5 minute spinules, 2nd with 2 setae of unequal lengths, 3rd and 4th each with 2 spinulose setae, 5th with 1 large spine with 2 rows of very minute spinules on its basal half, 6thwith 1 serrated seta; endopod 3-segmented, 1st segment with 2 serrated strong setae and 1 serrated minute seta, 2nd with 2 serrated strong setae, 3rd with 2 serrated strong setae. Mxp with 2-segmented basipodite and 5-segmented endopodite

Species Metacalanus curvirostris - Plate 3 of morphological figuresissued from : S. Ohtsuka in Publ. Seto Mar. Biol. Lab., 1985, 30 (4/6). [p.302, Fig.11].
Female: A, P1 (anterior); B, P2 (anterior); C, P3 (anterior); D, P4 (posterior); E, P5 (anterior).

Nota: P5 nearly symmetrical and 3-segmented, 1st segment unarmed, 2nd with 1 seta on the outer distal end (the seta of the right leg is plumose and thicker than the counterpart of the left leg; terminal segment with 1 large seta which bears minute spinules along its outer margin and minute hairs on its inner margin.

Species Metacalanus curvirostris - Plate 4 of morphological figuresissued from : S. Ohtsuka in Publ. Seto Mar. Biol. Lab., 1985, 30 (4/6). [p.304, Fig.12].
Male: A, habitus (dorsal); B, idem (lateal right side); C, rostrum; D, P5 (posterior).

Nota: Left A1 geniculate, 17-segmented (8th and 9th segments partly fused; right A1 19-segmented (8th and 9th segments almost fused). P5 nearly symmetrical, uniramous and 5-segmente, terminal segment apically bearing 1 large seta which arries minute spinules on its inner side. Urosome 5-segmented.

Species Metacalanus curvirostris - Plate 5 of morphological figuresIssued from : M. Chihara & M. Murano in An Illustrated Guide to Marine Plankton in Japan, 1997. [p.724, Pl. 53, fig.57 b-e].
Female: b, P5; d, habitus (dorsal).

Male: c, P5; e, habitus (dorsal).

Nota: Numbers show species characters.

NZ: 1

Distribution map of Metacalanus curvirostris by geographical zones
Japan (Tanabe Bay)
N: 1
(291) F: 1,19; M: 0,89; {F: 1,19; M: 0,89}
Rem.: hyperbenthic (coastal).
According to Ohtsuka (1985, p.305i , both sexes have heavily chitinized mandibular gnathobases with their sharp teeth, stout masillae (Mx2) and maxillipeds (Mxp), as M. acutioperculum; remains of copepods were detected in the gut of both sexes as in Paramisophria itoi. Probably the species is carnivorous.
Last update : 17/01/2015
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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 September 24, 2021]

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