Abstract
A new trematode of family Pleorchidae, Poche, 1926 Pleorchis karachiensis n.sp. is described here from the intestine of the fish
Sciaena dussumeiri of Karachi coast. This species is characterized by having elongate body almost uniformly thick throughout its
length with a rounded caudal appendage, oral sucker is terminal projecting out, rounded, prepharynx and esophagus prominent,
pharynx transversely elongate, ceca long terminating anterior to caudal appendage, anterior cecal diverticula are absent, acetabulum
small, spherical and a little behind cecal bifurcation, genital pore preacetabular, testes 50-52 in number, intercecal situated on each
side of excretory bladder in two ventral and two dorsal longitudinal rows, cirrus sac claviform, extending laterally on right side of
acetabulum and reaching in postacetabular region containing elongate seminal vesicle and pars prostatica. Ovary is median, 8 to 9
lobed, prestesticular, vitellaria consist of numerous small follicles extending from anterior level, post bifurcal to posterior end of the
body proper but not reaching the caudal appendage, uterus coiled, between ovary and acetabulum, eggs numerous, elongate,
metraterm prominent. Excretory vesicle tubular, excretory pore terminal.
