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Scientific classification
Domain: Eukaryota
(unranked): Sar
Superphylum: Alveolata
Phylum: Apicomplexa
Class: Conoidasida
Subclass: Gregarinasina
Order: Neogregarinorida
Family: Syncystidae
Schneider 1886


The Syncystidae are a family of parasitic protozoa in the phylum Apicomplexa. Species in this family infect insects (Aeshnidae).


This family was described by Schneider in 1886.


One genus and two species (Syncystis aeshnae, Syncystis mirabilis) are currently recognised in this family.[1]

The type species is Syncystis mirabilis Schneider 1886.


The development of these parasites is mostly intracellular. Merogony results in the formation of about 150 elongate, slender merozoites which become spheroidal as they differentiate into amoeboid or spheroidal gamonts.

The gamonts associate in syzygy and subdivide into gametes. Fusion of the gametes leads to numerous zygotes within the gametocyst which is either spherical or bilobed. Numerous (30 to 150) oocysts are formed per gametocyst.

The oocysts are navicular and have three or four spines extending from each pole of the wall. Eight sporozoites form per oocyst.


  1. ^ Tuzet O, Manier JF (1953) Syncystis aeschnae n.sp. Néogrégarine (Schizogrégarine, Léger, 1900) parasite des larves d'Aeschna. Ann Nat Sci Zool IIe ser 15:241-246