Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Tortanidae ( Family )
            Tortanus ( Genus )
                Atortus ( Sub-Genus )
Tortanus (Atortus) rubidus  Tanaka, 1965   (F,M)
Tanaka, 1965 (p.398, Descr.M, figs.M); Bowman, 1971 a (p.527); Ohtsuka & Kimoto, 1989 (p.398, Descr.F, Redescr.M, figs.F,M); Ohtsuka,1992 a (p.265); Chihara & Omori, 1997 (p.926, Pl.188,189: F,M); Barthélémy & al., 2003 (p.25, figs.F: genital somite).
Species Tortanus (Atortus) rubidus - Plate 1 of morphological figuresissued from : O. Tanaka in Publs Seto Mar. Biol. Lab., 1965, XII (5). [p.399, Fig.251].
Male: a, habitus (dorsal); b, forehead (left lateral side); c, last thoracic segment and urosome (right lateral side); d, middle portion of clasping of A1; e, P5; f, P5 (juvenile).

Species Tortanus (Atortus) rubidus - Plate 2 of morphological figuresissued from : S. Ohtsuka & K. Kimoto in J. Crustacean Biol., 1989, 9 (3). [p.401, Fig.7].
Female (from Shijiki Bay, Japan): A, habitus (dorsal); B, 5th pediger and urosome (lateral left side); C, idem (dorsal); D, genital segment (ventral); E, A1; F, P5 (anterior).

Species Tortanus (Atortus) rubidus - Plate 3 of morphological figuresissued from : S. Ohtsuka & K. Kimoto in J. Crustacean Biol., 1989, 9 (3). [p.403, Fig.9].
Male (from Shijiki Bay): A, habitus (dorsal); B, urosome (dorsal); C, 2nd urosomal segment ( ventrolateral view); D-E, urosome (dorsolateral view); F, right A1 (segments 14-21); G, P5 (anterior); H, right P5 (posterior).

Species Tortanus (Atortus) rubidus - Plate 4 of morphological figuresissued from : S. Ohtsuka & K. Kimoto in J. Crustacean Biol., 1989, 9 (3). [p.402, Fig.8];
Male (from Sagami Bay, Japan): A, urosome (dorsolateral view); B, P5 (anterior).

Species Tortanus (Atortus) rubidus - Plate 5 of morphological figuresissued from : S. Ohtsuka & R. Huys in Hydrobiologia, 2001, 453/454. [p.457, Fig.11, A-B].
Female (from Japan): A-B, ventral view of urosome, covered by complex spermatophore (two different specimens).
s: spermatophore; c, caudal rami; large arrow: opening of spermatophore from which fertilized eggs may be released; small arrow: rudimentary P5.
Scale bars = 0.1 mm.

Nota: The species with a rudimentary plate-like P5 (indicated by small arrow) have a complex coupling device on the spermatophore which almost entirely covers the urosome of the female, and is not readily detached from it using dissecting needles. A spermatophore so firmly glued onto the female urosome may remain on it after all egg clutches have been fertilized within the genital atrium (Barthélémy & al., 1998) and released. A large pore (about 0.00 mm) in diameter is present on the ventral side of the spermatophore (indicated by large arrow), beneath which the gonopore is located. This pore seems to be the only opening for releasing the fertilized eggs.

Compl. Ref.:
Shimode & Shirayama, 2004 (tab.2); Nishida & Cho, 2005 (p.232, Fig.4: chart)
NZ: 1

Distribution map of Tortanus (Atortus) rubidus by geographical zones
Species Tortanus (Atortus) rubidus - Distribution map 2issued from : S. Ohtsuka & K. Kimoto in J. Crustacean Biol., 1989, 9 (3). [p.404, Fig.10].
Distribution of several species of the subgenus Atortus. Localities: 1, Poseta Bay; 2, Sagami Bay; 3, Tanabe Bay; 4, Shijiki Bay; 5, Shibushi Bay; 6, Ryukyu Islands; 7, Pago Pago Harbor, Samoa; 8, Palau Tiga, Sabah; 9, Saleyer Anchorage; 10, Nankauri Harbor, Nicobars.
Japan (Sagami Bay, Tanabe Bay, Shijiki Bay)
N: 3
(119) M: 2,3-2,09; (642) F: 2,37; 2,33; M: 2,11-1,92; M: 2,1; 2,02; {F: 2,02-2,37; M: 1,92-2,30}
Rem.: For Nishida & Cho (2005, p.229) this species belongs in the subgenus Atortus to the ''species complex tropicus''.
Last update : 18/09/2018
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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 September 28, 2022]

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