Redescription of Prosthenhystera obesa (Diesing, 1850) (Callodistomidae, Digenea) with new host records and data on morphological variability

ABSTRACT

Prosthenhystera obesa (Diesing, 1859) Travassos, 1992 from the gall bladder of Astyanax bimaculatus, Caranx gibbosus, Galeocharax humeralis, Leporinus copelandii, Pimelodus fur, Pseudopimelodus roosevelti, Salminus brevidens, Salminus maxillosus and from the new hosts. Cynopatamus amazonum and Triurobrycon lundii is redescribed demonstrating a large morphological variation, mainly in body and testes size and shape. New hosts harbouring immature specimens of P. obesa are presented: Brycon sp., Leporellus vittatus, Pachvurus squamipinnis, Pimelodus clarias, Pseudoplatystoma corruscans and Salminus hilarii. Scanning electron microscopy micrographies, original figures and measurements of adult and immature specimens from different Brazilian hosts and localities presented.