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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: Eugregarinorida
Léger 1900
Suborder: Blastogregarinorina
Chatton & Villeneuve 1936
Families and genera


Blastogregarinorina is a suborder of parasitic protozoa of the phylum Apicomplexia


This suborder has currently has one family with one genus which contains one species Siedleckia caulleryi. This species is found in marine polychaetes.


This suborder was described by Chatton and Villeneuve in 1936[1]


A mucron is present

Syzygy does not occur.

The gamonts are composed of a single structure without septa: they lack both protomerites and deutomerites.

Anisogamy — unequal sized gamonts — is present. Gamogony occurs with gamonts still attached to intestinal wall. The gametes bud off gamonts. Gametocysts are absent

There is no sporocyst.

The zygote gives rise to 10–16 oocysts.