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Scientific classification
Domain: Eukaryota
Kingdom: Chromalveolata
Superphylum: Alveolata
Phylum: Apicomplexa
Levine 1970
Class: Conoidasida
Levine 1988
Subclass: Gregarinasina
Dufour 1828
Order: Neogregarinorida
Grassé & Schrével 1953
Family: Schizocystidae


The Schizocystidae are a family of parasitic protozoa in the phylum Apicomplexa. Species in this family infect insects (Diptera, Coleoptera and Hemiptera).


This family was created by Léger and Duboscq in 1908.


Three genera are currently recognised in this family.

Life cycle[edit]

The parasites develop in extracellular locations.

The trophozoites are large, band like and wide. They have longitudinal striae and are aseptate. A mucron of small pseudopods or sucker is present. The nuclei are large.

Merogony occurs once in the life cycle. Nuclear division proceeds with binary fission during growth. Cytokinesis occurs to form uninucleate merozoites arranged in clusters in the shape of the trophozoite.

The merozoites become free by dropping off the parent trophozoite.

Gamonts, gametocysts and oocysts are of the actinocephalid type with syzygy occurring just before gametocyst formation.

The young gamonts are vermiform (wormlike).

The gametocysts are mostly spherical.

The oocysts are spindle shaped with eight sporozoites.