Family: Pseudostome ventral, more or less invaginated (Illustrated Guide, 1985).
Genus: Test circular, ovoid or discoid; pseudostome eccentric (acentric), circular or ovoidal; with or without
spines (Kudo, 1966).
Centropyxis (aculeata small variety?), x 400, x 640, Uruguay Nov. 1999, photo by Yuuji Tsukii