Gregarinasina

Apicomplexan sporozoa, mature gamonts are large and generally develop extracellularly, anterior mucron is formed from the conoid or an epimerite is formed in the sporozoites, meronts, merozoites, and gamonts; syzygy of gamonts generally occurs and similar number of gametes develop in each gametocyte, gametes usually similar, but in a few species anisogametes develop with the male gamete sometimes having a flagellum or flagelliform process; zygotes form oocysts within gametocysts such that the life cycle typically consists of gametogony and sporogony; mostly parasites of the digestive tract or body cavity of invertebrates or lower chordates and are generally with one host.