Abstract
The cercaria of Mosesia chordeilesia is a virgulate species identified as Cercaria neustica Seitner which develops in Goniobasis livescens and Pleurocera acuta and encysts in naiads of Hexagenia limbata. Adults were obtained by feeding experimentally infected naiads to chicks and a hamster. Unencysted metacercariae were not found free in the body cavity of the arthropod, but a localized or generalized disintegration of the cyst wall suggests that with age the metacercaria may escape. The primary excretory pores of the cercaria are in the body-tail furrow. A flame cell formula of 2[(2 + 2 +2) + (2 + 2 + 2)] was observed in both the cercaria and adult. Mosesia Travassos, 1928 is emended to include M. chordeilesia which is redescribed on the basis of material from natural and experimental infections.
Keywords