Species Card of Copepod
Calanoida ( Order )
    Diaptomoidea ( Superfamily )
        Tortanidae ( Family )
            Tortanus ( Genus )
                Atortus ( Sub-Genus )
Tortanus (Atortus) omorii  Mulyadi, Nishida & Ohtsuka, 2017   (M)
Ref.:
Mulyadi, Nishida & Ohtsuka, 2017 (p. 87, Descr. M, figs. M, Rem.)
Species Tortanus (Atortus) omorii - Plate 1 of morphological figuresIssued from: Mulyadi, S. Nishida & S. Ohtsuka in Crustaceana, 2017, 90 (1). [p.88, Fig.6].
Male (from 1°24.265'N, 125°07.219'E): a, habitus (dorsal); b, urosome (dorsal); c, urosomites 1-3 (dorsal); d, P5; e, exopodal segment 2 of left P5; f, right A1 (number of ancestral segment indicated by Roman numerals).

Nota:
- Prosome about 2.7 times as long as urosome.
- Posterior corners of prosome produced into asymmetrical lobes, right lobe wider than left.
- Genital somite asymmetrical, left sides lightly more produced posteriorly than right.
- Urosomite 2 furnished with posterolateral process on right side, bearing terminal setule;
- Anal somite partly fused with caudal rami.
- Caudal rami asymmetrical, right ramus wider than left.
- Appendages as in male T. (A.) sulawesiensis, except right A1 and P5.
- P5: Right leg coxa broad without ornament; basis bearing large ladle-shaped medial process with proximal and distal setule, distal half of segment broadened and curved medially; exopod slightly curved medially with 2 setae, middle part of inner margin emarginated. Left leg coxa with medioproximal depression; basis elongate with medioproximal semi-circular process with terminal setule; exopodal segment 1 with medial digitiform process located at proximal 1/4 of segment; exopodal segment 2 with longitudinal row of setules on medial margin, proximomedial seta, minute lateral seta at mid-length, subdistal lateral seta, medial subdistal notch, and rounded tip.

NZ: 1

Distribution map of Tortanus (Atortus) omorii by geographical zones
Loc:
Indonesia (off Tanjung Merah, Sulawesi E).

Type locality: 1°24.265' N, 125°07.219' E.
N: 1
Lg.:
(1314) M: 1,97; M: 1,97}
Rem.: For Mulyadi & al. (2017, p.89), the male of T. (A.) omorii belongs to the brevipes species complex, but cannot be assigned to either the longipes or rebids species groups within the species complex, because the posterior corners of the prosome are asymmetrical but of subequal length (left side longer in the longipes group, symmetrical in rubidus group), the coxa of the right P5 has no medial process (as in the longipes group; process present in the rubidus group), and the basis of the left P5 has no sinuate medial margin (as in the rubidus group; margin sinuate in the longipes group). However, T. (A.) omorii is distinguished from the other species of the brevipes species complex by the characteristic ladle-shaped process on the basis of the male right P5.
Last update : 05/04/2018
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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 May 21, 2022]

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