Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2018-04-04
Page range: 365–377
Abstract views: 70
PDF downloaded: 1

Description of two new pseudocerotids (Rahabditophora: Rhabditophora; Polycladida) from Andaman & Nicobar Islands, India

Zoological Survey of India, Andaman and Nicobar Regional Centre, Port Blair-744102, A & N Islands.
Zoological Survey of India, Andaman and Nicobar Regional Centre, Port Blair-744102, A & N Islands.
Zoological Survey of India, M- Block, New Alipore, Kolkata 700053
Platyhelminthes Marine flatworms Pseudoceros Acanthozoon new species taxonomy Pseudocerotidae Andaman Sea


The genus Pseudoceros is one of the flashiest among polyclads and is represented by 93 species worldwide while the genus Acanthozoon consists of polyclads with papillae and 14 valid species distributed around the world. Pseudoceros meenae sp. nov. and Acanthozoon fuscobulbosum sp. nov., based on morphological and histological characters have been described in the present paper. Pseudoceros meenae sp. nov. is characterised by white to cream body with three marginal bands; inner black, middle orange and a white rim while and Acanthozoon fuscobulbosum, sp. nov. is characterised by numerous brown and bulbous papillae of variable sizes on dorsum.



  1. Apte, D. & Pitale, R.D. (2011) New records of polyclad flatworms (Platyhelminthes: Turbellaria) from coral reefs of Lakshadweep Island, India. Journal of the Bombay Natural History Society, 108 (2), 109−113.

    Artois, T & Tyler, S. (2015) Polycladida. In: Tyler, S., Artois, T., Schilling, S., Hooge, M. & Bush, L.F. (Eds) (2006–2017). World list of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Accessed from: (12 Dec. 2017)

    Collingwood, C. (1876) On thirty-one species of marine planarians, collected partly by the late Dr. Kelaart, F.L.S. at Trincomalee, and partly by Dr Collingwood, F.L.S. in the eastern seas. Transactions of the Linnean Society of London. II (1), 83−98.

    Cuadrado, D., Moro, L. & Norena, C. (2017) The Polycladida (Platyhelminthes) of the Canary Islands. New genus, species and records. Zootaxa, 4312 (1), 038–068.

    Dixit, S. & Raghunathan, C. (2013) Polyclads of Andaman and Nicobar Islands. Journal of the Andaman Science Association, 18 (2), 165–169.

    Dixit, S., Sivaperuman, C. & Raghunathan, C. (2015) Three new records of polyclad flatworms from India. Marine Biodiversity Records, 8, e29.

    Dixit, S., Raghunathan, C. & Chandra, K. (2017a) Two new marine flatworms (Polycladida: Pseudocerotidae) from Andaman & Nicobar Islands, India. Zootaxa, 4221 (1), 111–122.

    Dixit, S., Raghunathan, C. & Chandra, K. (2017b) Two new Pseudoceros (Polycladida: Pseudocerotidae) and a Prostheceraeus (Polycladida: Euryleptidae) from Andaman and Nicobar Islands, India. Zootaxa, 4269 (4), 495–512.

    du Bois-Reymond Marcus, E. (1955) On Turbellaria and Polygordius from the Brazilian coast. Boletim da Faculdade de Filosofia Ciencias e Letras Universidade de Sao Paulo Zoologica, 20, 19−65.

    Faubel, A. (1984) The Polycladida, Turbellaria. Proposal and establishment of a new system. Part II. The Cotylea. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 81, 189–259.

    Heath, H. & McGregor, E.A. (1912) New polyclads from Monterey Bay, California. Proceedings of the Academy of Natural Sciences of Philadelphia, 64, 455−488.

    Jie, W.B., Gan, B.Q., Cgen, V.Y. & Kuo, S.H. (2016) Pseudoceros magangensis: a new species of pseudocerotid flatworm (Platyhelminthes: Polycladida) from Taiwan. Platax, 13, 33–50.

    Kelaart, E.F. (1858) Description of new and little known species of Ceylon nudibranchiate molluscs and zoophytes. The Journal of the Ceylon Branch of the Royal Asiatic Society. 3 (1856-58), 84−139.

    Laidlaw, F.F. (1902) The marine Turbellaria with an account of the anatomy of some species. In: Gardiner, J.S. (Ed.), The Fauna and Geography of the Maldive and Laccadive Archipelagoes: Being the Account of the Work carried on and of the Collections made by an Expedition during the years 1899 and 1900. Vol. 1. The University Press, Cambridge, pp. 282–312.

    Meixner, A. (1907) Polykladen von der Somalikueste, nebst einer Revision der Stylochinen. Zeitschrift für wissenschaftliche Zoologie, 88, 385–498.

    Newman, L.J. & Cannon, L.R.G. (1995) Colour pattern variation in the tropical flatworm, Pseudoceros (Platyhelminthes: Polycladida), with descriptions of three new species. The Raffles Bulletin of Zoology, 43 (2), 435–446.

    Newman, L.J. & Cannon, L.R.G. (1998) Pseudoceros (Platyhelminthes: Polycladida) from the Indo-Pacific with twelve new species from the Australia and Papua New Guinea. The Raffles Bulletin of Zoology, 46 (2), 293–323.

    Newman, L.J. & Cannon, L.R.G. (2003) Marine Flatworms. The World of Polyclads. CSIRO Publishing, Clayton, Australia, 97 pp.

    Newman, L.J. & Cannon, L.R.G. (2005) Fabulous Flatworms: a guide to marine polyclads. Version 1. ABRS & CSIRO Publishing: Clayton, Australia. CD-ROM.

    Pearse, A.S. (1938) Polyclads of the east coast of North America. Proceedings of the United States National Museum, 86, 67−98.

    Pitale, R., Bhave, V. & Apte, D. (2014) First record of family Prosthiostomidae and Prosthiostomum trilineatum (Platyhelminthes: Polycladida) from the west coast of India. Marine Biodiversity Records, 7, 1–6.

    Pitale, R. & Apte, D. (2017) First record of Thysanozoon brocchii (Platyhelminthes: Polycladida) from Indian waters. Marine Biodiversity Records, 10 (21), 1–11. 10.1186/s41200-017-0123-0

    Plehn, M. (1896) Neue Polycladen, gesammelt von Herrn Kapitän Chierchia bei der Erdumschiffung der Korvette Vettor Pisani, von Herrn Prof. Dr. Kükenthal im nördlichen Eismeer und von Herrn Prof Dr. Semon in Java. Jenaische Zeitschrift 30, 137−181.

    Quiroga, S.Y., Bolaños, D.M. & Litvaitis, M.K. (2006) First description of deep-sea polyclad flatworms from the North Pacific: Anocellidus n. gen. profundus n. sp. (Anocelidae, n. fam.) and Oligocladus voightae n. sp. (Euryleptidae). Zootaxa, 1317, 1–19.

    Schmarda, L.K. (1859) Neue Turbellarien, Rotatorien und Anneliden beobachtet und gesammelt auf einer Reise um die Erde 1853 bis 1857. In Neue Wirbellose Thiere I. Leipzig: Verlag von Wilhelm Engelmann, pp. 1–66.

    Sreeraj, C.R. & Raghunathan, C. (2011) New records of pseudocerotid polyclads from Andaman and Nicobar Islands, India. Marine Biodiversity Records, 4, e73.

    Sreeraj, C.R. & Raghunathan, C. (2013) Pseudocerotid polyclads (Platyhelminthes, Turbellaria, Polycladida) from Andaman and Nicobar Islands, India. Proceedings of the International Academy of Ecology and Environmental Sciences, 3 (1), 36–41.

    Sreeraj, C.R. & Raghunathan, C. (2015) A report on the coral reef dwelling polyclads of Nicobar Islands, India. Proceedings of the International Academy of Ecology and Environmental Sciences, 5 (2), 83−88.

    Sreeraj, C.R., Raghunathan, C., Raghuraman, R., Sudhanshu, D. & Venkataraman, K. (2015) Polyclads of Andaman and Nicobar Islands. Zoological Survey of India, Kolakata, 100 pp.

    Stummer-Traunfels, R. (1895) Tropische Polycladen. I. Das Genus Thysanozoon Grube. Zeitschrift für wissenschaftliche Zoologie, 60, 689–773.

    Tyler, S., Schilling, S., Hooge, M. & Bush, L.F. (Comp.) (2006–2017) Turbellarian taxonomic database. Version 1.7. Available from: (Accessed 25 April 2017)