Tortanus (Atortus) magnonyx - Species Card - Marine Planktonic Copepods

Species Card of Copepod

Calanoida ( Order )	details
Diaptomoidea ( Superfamily )	details
Tortanidae ( Family )	details
Tortanus ( Genus )	details	List species for this Genus
Atortus ( Sub-Genus )	details

Tortanus (Atortus) magnonyx Ohtsuka & Conway, 2005 (F,M)

Abbreviations or symbols

Ref.:

(

List of the studied authors )

Ohtsuka & Conway, 2005 (p.66, figs. F,M); Francis & Bijoy Nandan, 2019 (p.433, Table 4, 5).

Species Tortanus (Atortus) magnonyx - Plate 1 of morphological figures

issued from : S. Ohtsuka & D.V.P. Conway in J. Mar. Biol. Ass. U.K., 2005, 85 (1). [p.67, Fig.2].
Female (from mahé, Seychelles): A-B, habitus (dorsal and lateral, respectively); C-D, posterior prosome and urosome (dorsal); E, genital compound somite (dorsal); F-G, postrior prosome and urosome (right and left lateral view, respectively); H, genital compound and anal somites (ventral); I, P5 (posterior); J, phoront of apostome on intercoxal sclerite of P4.
Scale bars in mm.
Nota: Cephalosome and 1st pediger separate, 4th and 5th fused. Cephalosome protruded anteriorly into round expansion in which naupliar eyes involved and strongly grooved at dorsal mid-length. Posterior prosome slightly asymmetrical, with right side more swollen. P5 with both coxae and intercoxal sclerite completely fused to form common base; exopod unidegmented, left slightly lionger than right, each with 1 inner middle and 2 terminal, acutely pointed processes, terminal processes unequal on left but almost equal on right.

Species Tortanus (Atortus) magnonyx - Plate 2 of morphological figures

issued from : S. Ohtsuka & D.V.P. Conway in J. Mar. Biol. Ass. U.K., 2005, 85 (1). [p.68, Fig.3].
Male: A, habitus (dorsal); B, urosome (dorsal); C, right geniculate A1 (segments XVI to XXIV-XXVIII); D, P5 (anterior); E, right P5 (anterior); F, right P5 (posterior); G, basal process of right P5 with 1 terminal and 1 proximal setae; H, terminal portion of left P5.
Scale bars in mm.

Issued from : S.V. Francis & S. Bijoy Nandan in Turkish J. Zool., 2019, 43. [p.434, Table 4].
Differential diagnosis of T. magnonyx female. Compare with other species of the subgenus Atortus species from the Indian Ocean.

Morphological characters female:
- Genital compound somite strongly asymmetrical, with the pointed process on the right ventrolateral side.

Issued from : S.V. Francis & S. Bijoy Nandan in Turkish J. Zool., 2019, 43. [p.435, Table 5].
Differential diagnosis of T. magnonyx male. Compare with other species of the subgenus Atortus species from the Indian Ocean.

Morphological characters male:
- Left P5 subdistal seta serrated along inner margin. Right P5 basis tapering proximally with triangular process.

NZ:

Distribution map of Tortanus (Atortus) magnonyx by geographical zones

Distribution map of Tortanus (Atortus) magnonyx for the Zone Indian Ocean

Loc:

(

Geographical glossary )

SW Indian: Seychelles (Mahé: Baie Ternay), Mauritius (lagoon), Madagascar (Ile Ste Marie: Baie des Forbans)

Lg.:

(

References of the authors concerning dimensions )

(945) F: 2,17-2,25; 2,31-2,49; 2,20-2,31; M: 1,89-1,93; 2,09-2,20; 1,79-1,94; {F: 2,17-2,49; M: 1,79-2,20}

Rem.:

Inshore.
For Ohtsuka & Conway (2005, p.69) the presence of apostome phoronts on the swimming legs is interesting, as these were also recorded from shallow- and deep-water planktonic copepods in the Arabian Sea (Sewell, 1951). According to Ohtsuka & al. (2004), apostomes are likely to play an important ecological role as histophagous ciliates round the coast of western Japan and may thus also be important around the oceanic islands of the Indian Ocean.

Last update : 11/02/2020


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