REDESCRIPTION OF HAPALOTREMA-MISTROIDES (MONTICELLI, 1896) AND HAPALOTREMA-SYNORCHIS LUHMAN, 1935 (DIGENEA, SPIRORCHIDAE), WITH COMMENTS ONOTHER SPECIES IN THE GENUS

Hapalotrema mistroides (Monticelli, 1896) Stiles and Hassall, 1908 and Hapalotrema synorchis Luhman, 1935 are redescribed using specimens fr om the loggerhead turtle, Caretta caretta (L.). The redescription of H . mistroides is based on specimens collected by Looss and described as Hapalotrema constrictum Leared, 1862 and renamed Hapalotrema loossi P rice, 1934, which is now considered a junior synonym of H. mistroides. Hapalotrema orientalis Takeuti, 1942 is considered a junior synonym o f Hapalotrema synorchis. The redescriptions are consistent with the or iginals but provide an unreported range of variation while adding new information about the reproductive systems. Reexamination of Hapalotre ma dorsopora Daily, Fast, and Balazs, 1993 confirms the presence of a reproductive system typical for the genus and the absence of a dorsal genital pore; therefore, H. dorsopora is reduced to a junior synonym o f Hapalotrema mehrai Rao, 1976. Four valid species of Hapalotrema are recognized: H. mistroides, H. synorchis, H. postorchis, and H. mehrai, and a key to the species is provided.