A new species of Sprostoniella Bychowsky and Nagibina, 1967 (Monogenea : Capsalidae) from Chaetodipterus zonatus (Osteichthyes : Ephippidae) in Chamela Bay, Mexico

A new species of Sprostoniella is described from the gills of Chaetodipteru s zonatus in Chamela Bay, on the west coast of Mexico. The new species diff ers from the 2 previously described congeners by having smaller testes each of which is not nearly as long as the ovary. It further differs from the t ype species, Sprostoniella multitestis, by having a poorly developed pair o f accessory sclerites and the cecal diverticula are not confluent posterior ly. The new species also differs from Sprostoniella micrancyra, the other s pecies of the genus, by having a shorter peduncle, the glands of Goto are s maller than the testes and ovary, and by having a slightly different haptor al structure, with 1 pair of hamuli rather than 2 pairs, and 1 central hapt oral loculus instead of 2 loculi.