Abstract
An acanthocephala Neoechinorhynchus longiorchis .n.sp of family Neoechinorhynchidae based on male specimens is described from
the fish Otolithus argenteus (Sciaenidae) of Karachi Coast,Pakistan.The body size of specimens ,number of proboscis hooks ,size of leminisci,testes ,cement glands,cement reservoir,saefftigen's pouch and seminal vesicle morphology serve to distinguish Neoechinorhynchus longiorchis.n.sp from previously described species of the genus.
