A gregarine parasite of the former group Monocystidea or the family Monocystidae, characterized by adults that are aseptate.
Such gregarines are typified by the genus Monocystis, whose members are parasites of earthworms.
Designating a gregarine in which the adult is aseptate; of or relating to the former group Monocystidea or the family Monocystidae.
Late 19th century; earliest use found in Ray Lankester (1847–1929), zoologist. Originally from scientific Latin Monocystidea, group name from ancient Greek μονο- + κύστις + scientific Latin -idea, after scientific Latin Monocystis, genus name.