Description of a new species of the genus Raphidascaroides Yamaguti, 1941 (Nematoda: Heterocheilidae (from the shark, Sphyrna ztgaena (Linnaeus) at Visakhapatnam, India.

A new species of the nematode genus Raphidascaroides Yamaguti, 1941 obtained from the intestine of hammer-headed shark, Sphyrna zygaena (Linnaeus) from Visakhapatnam is described. The specimens do not agree with the description of known species of the genus. Raphidascaroides zygaenai has been established by body size, length of oesophagus and oesophageal appendix, size of spicules, number and arrangement of caudal papillae, vulva position and structure of tail end.