Two New Tetraphyllidean Cestodes from Potamotrygon circularis Garman (Chondrichthyes: Potamotrygonidae) in the Itacnai River, Brazill

Authors

Monte A. Mayes, Dow Chemical USA
Daniel R. Brooks, University of British ColumbiaFollow
Thomas B. Thorson, University of Nebraska-Lincoln

Date of this Version

1981

Comments

Published in Proceedings of the Helminthological Society of Washington 48(1), 1981, pp. 38-42

Abstract

The new genus Rhinebothroides is proposed to include three species of Rhinebothriumlike cestodes parasitizing freshwater stingrays in South America. They differ from Rhinebothrium species by having squared rather than elongate bothridia, by possessing internal seminal vesicles, and by exhibiting terminal genitalia at the ovarian level. Rhinebothroides circularisi sp. n. in Potamotrygon circularis from the Itacuai River in northwestern Brazil differs from R. moralarai by having more testes and bothridial loculi and differs from R. scorzai by lacking vitelline follicles proximate to the genital pore, by having a straight rather than coiled vagina, and by possessing craspedote rather than acraspedote proglottids. Potamotrygon circularis from the Itacuai River also hosted Potamotrygonocestus amazonensis sp. n. which differs from the only other member of the genus, P. magdalenensis, by having bothridial hooks 58-78µm long rather than 43-55 µm long, by possessing a shallow genital atrium rather than lacking one, and by having follicular rather than compact vitellaria.