A new trematode of the genus Genarchopsis Ozaki, 1925 from freshwater fish of Sindh, Pakistan

During a survey of helminthes parasites of fishes twelve trematodes were collected from the small intestine of fish Channa (Ophiocephalus) striatus (Bl.) and Channa (Ophiocephalus) maculatus (Bl.) and identified as Genarchopsis gibsoni new species and G. kalriai Bilqees and Khan, 1991. The present new species is separated from the previously described species of the genus in having body elongate, rounded at anterior extremity, narrower at hind body and bluntly pointed at posterior extremity, widest at the acetabular region. Forebody much longer than hindbody. Pharynx oval. Prepharynx and esophagus absent. Acetabulum near the posterior end, very large almost occupying the whole width of the body. Testes, postacetabular and transversely elongated. Genital opening at the level of the posterior margin of the pharynx. Cirrus sac long, intercecal, curved dorsally containing prominent elongate seminal vesicle and long pars prostatica. Vitellaria consist of two very small, dark, elongate masses. Ovary, vitellaria and testes are all close to each other. Uterus occupying preacetabular region and reach to end of ceca posterior to acetabulum. While G. kalriai Bilqees and Khan, 1991 is being reported from a different host, earlier this species was reported from freshwater fish Channa (Ophiocephalus) marulius (Ham.)