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Scientific classification
Domain: Eukaryota
(unranked): Sar
(unranked): Alveolata
Phylum: Apicomplexa
Class: Conoidasida
Subclass: Gregarinasina
Order: Archigregarinorida
Family: Exoschizonidae
Genus: Exoschizon

Exoschizon is a genus in the phylum Apicomplexa.


This genus was created by Levine in 1971.[1]


There is one genus currently recognised in this family - Exoschizon. This genus has only one species - Exoschizon siphonosomae - which was described by Hukui in 1939.[2]


This species was found in the intestine of a sipunculid worm (Siphonosoma cumanense) in Japan.

The meronts measure 90 µm × 15 µm. There are ~13 longitudinal striations per side.

The meronts and gamonts are similarly shaped.

Transmission is presumably by the orofaecal route.


  1. ^ Levine ND (1971) Taxonomy of the Archigregarinorida and Selenidiidae (Protozoa, Apicomplexa) J Euk Microbiol 18 (4) 704–717 DOI: 10.1111/j.1550-7408.1971.tb03401.x
  2. ^ Hukui (1939) J Fac Sci Hiroshima Univ 7: 17