Sivasankaran BIJOY NANDAN, Sanu Vengasseril FRANCIS

A new species of Tortanus (Atortus) (Copepoda, Calanoida, Tortanidae) from Minicoy Island, southeastern Arabian Sea

A new species of the planktonic calanoid copepod genus Tortanus, subgenus Atortus, is described from a coral reef lagoonof Minicoy Island, southeastern Arabian Sea. The new species is included in the tropicus group, which is mainly distributed in thetropical and subtropical waters of Southeast Asia. The species can be distinguished from all other species of the tropicus group by theasymmetrical fifth pedigerous somite with notched left margin and triangular lobe in the right, hyaline coupling device with larger leftprocess, 2 ventrolateral spines in the genital compound somite, and caudal rami with 2 medial rounded processes in the female. In themale, serrated ridge of the right antennule slightly raised from the surface plane, beak-shaped medial process on the right fifth leg coxa,triangular medial process on the basis, and strongly curved subdistal seta on the left fifth leg. Mitochondrial cytochrome oxidase subunitI sequences of the specimens obtained with 642 base pairs confirmed the female–male correspondence and revealed the genetic identityof the species, which is herein compared with mtCOI sequences of congeners.

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Ambler JW, Frost BW (1974). The feeding behaviour of a predatory planktonic copepod, Tortanus discaudatus. Limnol Oceanogr 9: 446-451.
Bowman TE (1971). Tortanus scaphus and Tortanus lophus, new Pacific planktonic copepods, with notes on Tortanus murrayi (Calanoida, Tortanidae). Pac Sci 25: 52-528.
Brodsky KA (1950). Calanoida of polar and far-eastern seas of the U.S.S.R. Opredeliteli po Fauna SSSR 35: 1-442.
Bucklin A, Hopcroft RR, Kosobokova KN, Nigro LM, Ortman BD, Jennings RM, Sweetman CJ (2010). DNA barcoding of Arctic Ocean holozooplankton for species identification and recognition. Deep Sea Res Pt II 57:40-48.
Carl J (1907). Copépodes d’Amboine. Rev Suisse Zool 15: 7-18 (in French).
Chen QC, Hwang JS (1999). A new species of Tortanus (Copepoda, Calanoida) from Taiwan. Crustaceana 72: 265-271.
Dana JD (1849). Conspectus Crustaceorum quae in orbis terrarium circumnavigatione, Carolo Wilkes e vlasse Reipublicae Foederatae Duce, lexit et descripsit Jacobus D. Dana. Pars II. Proceedings of the Academy of Arts and Sciences 2: 9-61 (in Latin).
Folmer O, Black M, Hoeh W, Lutz R, Vrijenhoek R (1994). DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates. Mol Mar Biol Biotechnol 3: 294-299.
Francis SV, Nishida S (2018). Amendment of the status of Pontella sewelli Heinrich, 1987, as a junior synonym of P. sinica Chen and Zhang, 1965, with confirmation of female-male matching by genetic analysis. Crustaceana 91: 439-449.
Francis SV, Nishida S, Nandan SB (2018). Validation of male Pontella spinipes Giesbrecht, 1889 (Copepoda: Calanoida: Pontellidae) based on morphological and mitochondrial COI gene sequence analysis. Zool Stud 57: 16.
Hall TA (1999). BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/ NT. Nucleic Acids Symposium Series 41: 95-98.
Giesbrecht W (1889). Elenco dei Copepodi pelagici raccolti dal tenente di vascello Gaetano Chierchia durante il viaggio della R. Corvetta <> negli anni 1882-1885 e dal tenente di vascello Francesco Orsini nel Mar Rosso, nel 1884.
Atti dell’Academia nazionale dei Lincei. Rendiconti 5: 811-815 (in Italian).
Hooff RC, Bollens SM (2004). Functional response and potential predatory impact of Tortanus dextrilobatus, a carnivorous copepod recently introduced to the San Francisco Estuary. Mar Ecol Prog Ser 277: 167-179.
Huys R, Boxshall GA (1991). Copepod Evolution. London, UK: The Ray Society.
Jones EC, Park TS (1968). A new species of Tortanus (Calanoida) from Pago Pago Harbor, American Samoa. Crustaceana (Suppl. 1), Studies on Copepoda: 152-158. Malaysia. Malaysian Nature Journal 41: 61-73.
Mulyadi, Nishida S, Ohtsuka S (2017). Seven new species of Tortanus (Atortus) (Copepoda, Calanoida, Tortanidae) from North Sulawesi, Indonesia. Crustaceana 90: 77-99.
Nishida S, Anandavelu I, Padmavati G (2015). Two new species of Tortanus (Atortus) (Copepoda, Calanoida, Tortanidae) from the Andaman Islands. Crustaceana 88: 216-230.
Nishida S, Cho N (2005). A new species of Tortanus (Atortus) (Copepoda, Calanoida, Tortanidae) from the coastal waters of Nha Trang, Vietnam. Crustaceana 78: 223-235.
Ohtsuka S, El-Sherbiny MM, Ueda H (2000). Taxonomy, functional morphology, and behavioural ecology of the planktonic calanoid copepod Tortanus (Atortus). Crustacean Research 29: 1-11.
Ohtsuka S, Kimoto K (1989). Tortanus (Atortus) (Copepoda: Calanoida) of southern Japanese waters, with description of two new species, T. (A.) digitalis and T. (A.) ryukyuensis, and discussion on distribution and swarming behavior of Atortus. J Crustacean Biol 9: 392-408.
Ohtsuka S, Reid JW (1998). Phylogeny and zoogeography of the planktonic copepod genus Tortanus (Calanoida: Tortnidae), with establishment of a new subgenus and descriptions of two new species. J Crustacean Biol 18: 774-807.
Othman BHR (1987). Two new species of Tortanus (Crustacea, Copepoda) from Sabah, Malaysia. Malaysian Nature Journal 4: 61-73.
Sewell RBS (1932). The Copepoda of Indian seas. Calanoida. Memoirs of the Indian Museum 10: 223-407.
Tamura K, Peterson D, Peterson N, Stecher G, Nei M, Kumar S (2011). MEGA5: Molecular evolutionary genetics analysis using maximum likelihood, evolutionary distance, and maximum parsimony methods. Mol Biol Evol 28: 2731-2739.
Tanaka O (1965). The pelagic copepods of the Izu region, middle Japan systematic account XIII Parapontellidae, Acartidae and Tortanidae. Publications of the Seto Marine Biological Laboratory 12: 71-82.
Uye SI, Kayano Y (1994). Predatory feeding behaviour of Tortanus (Copepoda: Calanoida): life- stage differences and the predation impact on small planktonic crustacean. J Crustacean Biol 14: 473-473.