Paracreptotrema blancoi N. gen., N. sp (Digenea: Plagiorchiformes: Allocreadiidae) in the Onomina, Priapichthys annectens (Osteichthyes: Poeciliidae), from the area de Conservacion Guanacaste, Costa Rica

A new species of allocreadiid digenean is described from Priapichthys annectens (Regan) (Osteichthyes: Poeciliidae) in the Area de Conservacion Guancacaste. Costa Rica. A new genus. Paracreptotrema is proposed to accommodate this species as well as Fellodistomum mendezi Songandares-Bernal. 1955. which was previously described from another poecilliid. Brachyrhaphis episcopi. in Panama. paracreptotrema differs from all other nominal genera of Allocreadiidae by a combination of its symmetrical testes. restricted vitellaria and the lack of oral lappets (muscular 'papillae') or other such appendages. Paracreptotrema blancoi n. sp. resembles Creptotrema creptotrema Travassos. Artigas and Pereira. 1928. but differs in lacking ventral oral lappets and in having vitellaria extending posteriorly only to the level of the testes. It can be distinguished from P. mendezi n. comb in having a relatively larger and more posteriorly placed acetahulum vitellaria that are more restricted anteriorly smaller testes, and a uterus that does not extend to the posterior end of the body. The genus seems to be restricted to poeciliids in Central America.