Tortanus (Atortus) murrayi Scott A., 1909

Francis, S V, Purushothaman, J, Siddique, A, Bhowal, A & Prasad, H, 2023, Taxonomic description of the male Tortanus (Atortus) murrayi Scott A., 1909 (Copepoda, Calanoida, Tortanidae) from the Great Nicobar Island, Indian Ocean, Indian Journal of Geo Marine Sciences 52 (6), pp. 307-311 : 308

publication ID

https://doi.org/ 10.56042/ijms.v52i06.8352

DOI

https://doi.org/10.5281/zenodo.12607562

persistent identifier

https://treatment.plazi.org/id/038A87CE-7114-0569-FCED-8B658505B026

treatment provided by

Felipe

scientific name

Tortanus (Atortus) murrayi Scott A., 1909
status

 

Tortanus (Atortus) murrayi Scott A., 1909 View in CoL ( Fig. 2 View Fig )

Material examined: Two adult males, one dissected (TL: 2.34 mm) and mounted on a glass slide and the other intact male preserved in a vial ( Fig. 2 View Fig ; TL: 2.26 mm)

Diagnosis: Pr around three times longer than Ur ( Fig. 3a View Fig ). Posterior edges of Pdg 5 produced into circular and symmetrical processes. Ur of 5 somites, genital somite without any lateral processes. CR symmetrical. Right A1 geniculate ( Fig. 3b, c View Fig ), 15- segmented; ancestral segment I-VIII (segment 1), XXI-XXIII (segment 14) and XXIV-XXVIII (segment 15) totally or partially fused; segments XVI-XIX expanded. Armatures as stated: 1, (I-VIII) = 9+3ae; 2, (I) = 1; 3, (X) = 2+ae; 4, ( XI) = 0; 5, ( XII) = 0; 6, ( XIII) = 1; 7, ( XIV) = 1; 8, ( XV) = 0; 9, ( XVI) = 2+ae; 10, ( XVII) = 1; 11, ( XVIII) = 2+ae; 12, ( XIX) = 1+ae+P; 13, ( XX) = 1+P; 14, ( XXI-XXIII) = 2; 15, ( XXIV-XXVIII) = 1+7+ae. Segment XX anterior surface with a serrated ridge ( Fig. 3d View Fig ). Between segment XX and fused segments XXI-XXIII, a hinge junction is developed. Indent on anterior surface towards a proximal end of the latter segment. A lengthy spine-like process that spans nearly whole length of the fused segments XXIV-XXVIII located at the distal end. Antennule, antenna, mandible palp, mandible gnathobase, maxillule, maxilla and maxilliped (mouth appendages) similar to female specimens described from the South Andaman 9. First to fourth swimming legs exhibit similarities to those observed in recently described congeners from the Indian Ocean 9,14-16. Right P5 ( Fig. 3e View Fig ) CO swollen, irregular pentagon-shaped with large triangular process; BA swollen, curves medially; small triangular process anteriorly; large, sharply pointed process emerges near inner proximal end; medial margin with three lamellae - proximal with three rounded processes; middle lamella triangular with rounded process proximally and seta at the base; distal lamella digitiform with rounded tip and subterminal seta. Claw-like Re; primary curve at 1/3 rd proximally; two finger-like processes on medioproximal margin; subdistal spinule on lateral margin; medial margin with subdistal triangular process short of distal end; segment terminates in a pointed tip; features one minute seta on mid-anterior. Left leg ( Fig. 3f View Fig ) CO devoid of processes; BA medial margin swollen near proximal and distal ends, one seta each near distal 1/3 rd of lateral and medial margins; Re-1 exhibits a digitiform process, terminal seta near proximal 1/3 rd of medial margin; Re-2 displays a rounded process on proximomedial margin with seta at its base, hirsute lateral margin, medial margin features lamellae at distal end and subterminal spine, apex possesses a long sinuate spine.

Kingdom

Animalia

Phylum

Arthropoda

Class

Copepoda

Order

Calanoida

Family

Tortanidae

Genus

Tortanus

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