A new species of Auriculostoma (Digenea:Allocreadiidae) in South America: life cycle and phylogenetic relationships

LIQUIN FLORENCIA; GILARDONI CARMEN; CREMONTE FLORENCIA; SARAVIA JOSÉ; CRISTOBAL HECTOR; DAVIES DORA

ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.

ACAD BRASILEIRA DE CIENCIAS

Lugar: Rio de Janeiro; Año: 2022

0001-3765

Auriculostoma is a genus of digenean (Trematoda) whose adults are parasites of Neotropical freshwater fishes. We describe a new species. Auriculostoma ocloya n. sp. using morphological and molecular tools, and we elucidated its life cycle, the first known of a species of this genus. The first intermediate host is the bivalve Pisidium ocloya, the second intermediate host is the amphipod Hyalella sp., and the definite hosts are siluriform fishes. The adult presents a single pair of muscular lobes on either side of the oral sucker with a broad base, stretching from ventrolateral to dorsolateral side, a structure that is also present in the rest of the species of the genus. Nevertheless, the new species differs from all the congeners mainly because in the dorsal side ?free? ends of the lobes are not present , and appear that they are fused,. This is the first study to provide sequence data on larval and adult stages of a species of Auriculostoma in South America. Our analyses demonstrated the its basal position among species of the genus in the phylogenetic analyses. Therefore, integrative morphological, molecular, and life cycle data on other South American species of the genus, would represent a contributedion for reveal more patterns in the allocreadiids systematics.