Apostomatida

Apostomatida
Scientific classification
Domain:	Eukaryota
(unranked):	SAR
(unranked):	Alveolata
Phylum:	Ciliophora
Class:	Oligohymenophorea
Order:	Apostomatida
Families
Colliniidae Cyrtocaryidae Foettingeriidae

The Apostomatida are an order of ciliates of the class Oligohymenophorea. Individuals of the order are called apostomes. They are symbiotic with Crustacea. They are dormant and encysted on their host's exoskeleton for the majority of their life cycle. The life cycle of apostomes varies; some genera will multiply by fission, after which the larvae will develop within the crustacean hosts. Physical characteristics may include a small cytostome (mouth), often accompanied by a glandular rosette, and sparse, hairlike projections (cilia) arranged in spiral rows on the organism.

References

Bradbury, Phyllis C.; Trager, William (October 1967). "Excystation of apostome ciliates in relation to molting of their crustacean hosts. II. Effect of glycogen" (PDF). Biological Bulletin. 133 (2): 310–316.
The Editors of Encyclopedia Britannica. "Apostome". Encylopedia Brittanica.

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