Description of a new subfamily Heckmanninae (Monorchiidae (Odhner, 1911) Nicoll, 1915) with a new genus and species from a freshwater fish of Sindh, Pakistan

A new subfamily Heckmanninae is described with a new genus and species Heckmannia channai n.gen., n.sp. from the intestine of Channa striatus (B1.). The subfamily is characterized by having elongated body, oral sucker subterminal, rounded, prepharynx very small, pharynx notched in the center, pharyngoesophageal gland cells present between pharynx and esophagus, terminal organ is absent, cirrus sac is preacetabular, genital pore submedian, postbifurcal. Acetabulum is pre-equatorial. Testis single, large, almost L-shaped, postacetabular, postovarian and postequatorial. Ovary is large, pretesticular, rounded with slightly irregular outline. Vitellarial consist of numerous follicles, scattered laterally from the level of ovary to posterior end of body, confluent in the post-testicular region. Uterus not visible.