Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Tortanidae ( Family )
            Tortanus ( Genus )
                Atortus ( Sub-Genus )
Tortanus (Atortus) tropicus  Sewell, 1932   (F,M)
Ref.:
Sewell, 1932 (p.400, figs.F,M); 1948 (p.324); Bowman, 1971 a (p.527); Silas, 1972 (p.650); Francis & Bijoy Nandan, 2019 (p.433, Table 4, 5).
Species Tortanus (Atortus) tropicus - Plate 1 of morphological figuresIssued from : R.B.S. Sewell in Mem. Indian Mus., 1932, X (continued). [p.402, fig.131].
Female (from Nicobar Is.): a, habitus (dorsal); b, Md; c, Mx1; d, Mxp; e, P5.

Male: f, grasping A1; g, P5.


Species Tortanus (Atortus) tropicus - Plate 2 of morphological figuresIssued from : S.V. Francis & S. Bijoy Nandan in Turkish J. Zool., 2019, 43. [p.434, Table 4].
Differential diagnosis of T. tropicus female. Compare with other species of the subgenus Atortus species from the Indian Ocean.

Morphological characters female:
- Genital compound somite with a small bulge on the left side. Caudal rami asymmetrical with left ramus stouter and right ramus slightly curved. P5 with spine at distal end.


Species Tortanus (Atortus) tropicus - Plate 3 of morphological figuresIssued from : S.V. Francis & S. Bijoy Nandan in Turkish J. Zool., 2019, 43. [p.435, Table 5].
Differential diagnosis of T. tropicus male. Compare with other species of the subgenus Atortus species from the Indian Ocean.

Morphological characters female:
- Right P5 basis bearing small rounded process.

Compl. Ref.:
Othman, 1987 (p.72); Ohtsuka, 1992 a (p.265); Nishida & Cho, 2005 (p.232, Fig.4: chart); Maiphae & Sa-ardrit, 2011 (p.641, Table 2, 3, Rem.)
NZ: 1

Distribution map of Tortanus (Atortus) tropicus by geographical zones
Loc:
NE Indian (Octavia Bay, Nankauri Harbour), Andaman Sea
N: 2
Lg.:
(44) F: 2,71; M: 2,289; {F: 2,71; M: 2,29}
Rem.: in surface tow-net.
For Nishida & Cho (2005, p.229) this species belongs in the subgenus Atortus to the ''species complex tropicus''.
Last update : 11/02/2020
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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 October 05, 2022]

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