Pseudomazzia macrolabiata n.gen.,n.sp. (Nematoda: Spiruridae: Mazziinae) from the fish Pomadasys olivaceus of Karachi coast.

A nematode Pseudomazzia macrolabiata of a new genus and a new species is described here from the intestine of the fish Pomadasys olivaceus of Karachi coast. The new genus is characterized by having an enlarged head region with three large prominent lips protruding externally from the head, a prominent buccal cavity and with a proboscis. The esophagus is not clearly divided into muscular and glandular parts and the intestine is simple. The male has very unequal spicules, dissimilar in shape. The caudal alae are prominent supported by several pedunculate papillae including 5 pre anal pairs and two pairs including one pro-anal and one post-anal. The female vulva is near the middle of the body. The tail is elongate, bluntly pointed and is provided with a terminal forked spike. The eggs are thin shelled and oval in shape.