Abstract
Polkepsilonema arabicensis sp. n. is discovered from the coralline sand of Lakshadweep island, located off the south-western coast of India. The species differs from other congeners by its unique combination of characters: presence of fine spines along the body curvatures, 5–6 rows of bisinuous ambulatory setae, male with two clusters of ventral copulatory thorns and 14 subcephalic sensilla. The novel species is the fourth discovery of the genus and first record from the coastal areas of Indian subcontinent. A key to species level is provided.
References
Ajay, K.K., Chaubey, A.K., Krishna, K.S., Gopala Rao, D. & Sar, D. (2010) Seaward dipping reflectors along the SW continental margin of India: Evidence for volcanic passive margin. Journal of Earth System Science, 119 (6), 803–813.
https://doi.org/10.1007/s12040-010-0061-2
Avraham, Z.B. & Bunce, E.T. (1977) Geophysical study of the Chagos-Laccadive Ridge, Indian Ocean. Journal of Geophysical Research, 82 (8), 1295–1305.
https://doi.org/10.1029/JB082i008p01295
Datta, T.K., Bhowmik, M. & Choudhury, A. (2018) Cobbia bengalensis sp. n. (Xyalidae: Monhysterida) from an eroding island of Sundarban, India. Zootaxa, 4444 (2), 179–188. https://doi.org/10.11646/zootaxa.4444.2.6
Decraemer, W. & Gourbault, N. (2000) New species of Leptepsilonema and Polkepsilonema (Nemata, Epsilonematidae). Cahiers de Biologie Marine, 41 (1), 5–46.
Decraemer, W., Gourbault, N. & Helléouet, M.N. (2001) Cosmopolitanism among nematodes: examples from Epsilonematidae. Vie et milieu, 51 (1–2), 1–19.
Gourbault, N. & Decraemer, W. (1994) Polkepsilonema firmatum sp. n., a marine nematode (Nemata: Epsilonematidae) from New Caledonia. Nematologica, 40, 485–493.
https://doi.org/10.1163/003525994X00364
Jones, S. (1986) Lakshadweep—general features and some considerations. The Marine Fisheries Information Service: Technical & Extension Series, 68, 3–6.
Kumaresan, S., Shekhar, S., Chakraborty, S., Sundaramanickam, A. & Kuly, N. (2018) Environmental variables and nutrients in selected islands of Lakshadweep Sea: Addressing coral bleaching. Regional Studies in Marine Science, 22, 38–48.
https://doi.org/10.1016/j.rsma.2018.05.004
Lorenzen, S. (1973) Die Familie Epsilonematidae (Nematodes). Mikrofauna des Meeresbodens, 25, 1–86. [409–494]
Sreenath, K.R., Jasmine, S., George, R.M., Ranjith, L., Mohamed Koya, K. & Kingsley, J. (2015) Community structure and spatial patterns in hard coral diversity of Agatti Island, Lakshadweep, India. Indian Journal of Fisheries, 62 (3), 36–44.
Steiner, G. (1927) Epsilonematidae—a New Nemic Family. Journal of Parasitology, 14, 65–66.
Somerfield, P.J. & Warwick, R.M. (2013) Chapter 6: Meiofauna Techniques. In: Eleftheriou, A. (Ed.), Methods for the Study of Marine Benthos. 4th Edition. John Wiley & Sons Ltd., pp. 253–284.
https://doi.org/10.1002/9781118542392.ch6
Tchesunov, A.V. (2014) Chapter 7.13 Order Desmodorida De Coninck, 1965. In: Schmidt-Rhaesa, A. (Eds.), Handbook of Zoology. Gastrotricha, Cycloneuralia, Gnathifera. Vol. 2. Nematoda. Walter De Gruyter, Berlin, pp. 399–434.
Verschelde, D. & Vincx, M. (1993) Polkepsilonema mombasae gen. et sp. n. and Pternepsilonema servaesae gen. et sp. n. (Nematoda, Epsilonematidae) from East African coasts. Hydrobiologia, 257, 129–142.