Ascocotyle (Ascocotyle) patagoniensis n. sp. (Trematoda: Heterophyidae) from the South American sea lion, Otaria flavescens, off Patagonia, Argentina.

HERNÁNDEZ-ORTS, J.S., MONTERO, F.E., CRESPO, E.A., GARCÍA, N.A., RAGA, J.A. & AZNAR, F.J.

JOURNAL OF PARASITOLOGY

AMER SOC PARASITOLOGISTS

Lugar: Washington, Estados Unidos; Año: 2012

0022-3395

We describe a new heterophyid species, Ascocotyle (Ascocotyle) patagoniensis n. sp. based on specimens collected from the intestine of the South American sea lion Otaria flavescens from Patagonia (Argentina). Ascocotyle (A.) patagoniensis is distinguished from the other species of the subgenus by the number of circumoral spines, which are arranged in two rows of 18 to 23. The new species also differs from the other species in having a gonotyl without papillae.The specimens exhibited the widest seminal receptacle described for a species of this subgenus. Species of the subgenus Ascocotyle usually infect fish-eating birds or mammals in freshwater or brackish habitats. Ascocotyle. (A.) patagoniensis is the first species of the subgenus described from a marine mammal. However, no metacercariae of Ascocotyle spp. were found in 542 marine teleosts from 20 species collected in the same locality. The life cycle of the marine species from the Ascocotyle-complex infecting pinnipeds remains elusive.