Definitive hosts: primates and some rodents
Site of infection: portal veins draining the large intestine
Typical size: males 12-15 mm long x 1 mm wide; females 18-20 mm long x 0.25 mm wide
Distribution: Africa; introduced into South America and the Caribbean
First intermediate host: a variety of snail species predomintely in the genus Bulinus (old world) and Tropicorbis (new world)
Metacercariae: none. Cercariae penetrate the skin of the definitive host directly