Studies On Cestode Genus Tylocephalum (Linton, 1890) In Trygon Sephen With Description Of New Species

Abstract

The present investigation deals with systematic observation of the cestode parasites Tylocephalum moraae new sps .of marine fish Trygon sephen from Sheva creek, Uran, West Coast of Maharashtra. The present worm comes closer to all the known species of the genus Tylocephalum in general topography of organ but differs due to scolex distinctly marked off from the strobilla, large in size, almost squarish in shape, clearly divided into two anterior and posterior, neck is short, wide, slightly broad at the base, narrow at the apex .Mature segments are longer than broad, cylindrical in shape with slightly convex or straight margins. Proglottids without projections at the anterior or posterior corners, testes are small, oval in shape, 68 in number, pre-ovarian, all placed anterior to the cirrus pouch, in two lateral fields. The cirrus pouch is medium in size, oval in shape, opens marginally. The cirrus is thin, slightly coiled, within the cirrus pouch .The vas deferens is thin and runs transversely for a short distance, turns posteriorly. The genital pores are small in size, oval in shape and open marginally. The ovary is medium in size, ‘U’ shaped and vitellaria are granular, thin strips, in corticular region