The species in this family infect the coelom of oligochaetes. They are spread by the oral-faecal route. The trophozoite is aseptate. The gamont is sac-like and extends at one end into two branches which divide dichotomously, forming eight to 16 secondary branches bearing groups of suckers. The oocysts are biconical (fusiform).
References
^Bhatia BL (1930) Synopsis of the genera and classification of haplocyte gregarines.
Parasitol 22: 156-167