Euclinostomum heterostomum (Rud., 1809) Travassos, 1928 (Trematodes: Clinostomidae: Euclinostominae): A New Record in Avian Host Little Cormorant (Aves: Phalacrocoracidae) of Pakistan

Present report is part of study carried out on helminths of little cormorants of ecological famous District Sanghar of southern province of Pakistan. Present study collected 26 trematodes having stout, linguiform, fleshy body, sub-terminal oral sucker, strongly muscular ventral sucker, 7-12 cecal diverticula, asymmetrical anterior and posterior testes, round cirrus sac and small vitellaria. These were collected from esophagus of host bird and identified as Euclinostomum heterostomum (Rud., 1809) Travassos, 1928. This trematode is recorded for the first time from little cormorant in Pakistan. However, reports are available on genus Euclinostomum of fish and other birds of Pakistan.