Patterns of argentophilic papillae of Schistosoma rodhaini and S. mansoni cercariae.

Argentophilic papillar patterns on cercariae of Schistosoma rodhaini from Kenya and S. Africa, and S. mansoni from Kenya and Brazil were compared with each other and with earlier results on cercariae of a Puerto Rican stock. The basic total number of papillae of both species is the same (62), and the basic numbers of papillae in the various groups are the same: dorsal, 20; ventral, 18; lateral, 10 on each side; and acetabular, 4. The cercariae of these 2 species differ, however, in patterns of papillae, chiefly the dorsal patterns, and can be distinguished from each other.