Neogregarinorida

Neogregarinorida
Scientific classification
Domain:	Eukaryota
(unranked):	Sar
(unranked):	Alveolata
Phylum:	Apicomplexa
Class:	Conoidasida
Subclass:	Gregarinasina
Order:	Neogregarinorida; Grassé & Schrével 1953
Families
	Caulleryellidae; ; Gigaductidae; ; Lipotrophidae; ; Schizogregarinina; Ophryocystidae; ; Schizocystidae; ; ; Syncystidae;

The Neogregarinorida are an order of parasitic alveolates in the phylum Apicomplexa.^[1] Species in this order infect insects and are usually found in the fat body, hemolymph, hypodermis, intestine or Malpighian tubules. The most common site of infection is the fat body: many species are pathogenic for their hosts.

The species in this order are predominantly intracellular parasites.

Taxonomy[]

Six families are in this order, with 13 genera. The type genus is .

Two families (Ophryocystidae and Schizocystidae) belong to the suborder Schizogregarinina.

They appear to have evolved from the Eugregarinorida.^[2] Merogony as part of the life cycle separates them from the Eugregarinorida and appears to have been derived as a secondary characteristic.

A phylogenetic analysis of the small subunit RNA suggests Ophryocystis may actually be a eugregarine rather than a neogregarine.^[3]

General characteristics[]

Merogony, gamogony and sporogony are present in all species
They are septate with , and
A conoidal complex is present through a major portion of their life cycles
A mucron is formed from eversion of the conoidal complex similar to the eugregarines
Merogony occurs by budding from the meront cell surface as in the coccidia
join in head-to-head syzygy (the conoidal complexes face each other)

References[]

^ Jeon, Kwang W. (2006). International Review Of Cytology: A Survey of Cell Biology. Academic Press. ISBN 978-0-08-046350-6.
^ Leander BS (February 2008). "Marine gregarines: evolutionary prelude to the apicomplexan radiation?". Trends Parasitol. 24 (2): 60–7. doi:10.1016/j.pt.2007.11.005. PMID 18226585.
^ Leander BS, Harper JT, Keeling PJ (December 2003). "Molecular phylogeny and surface morphology of marine aseptate gregarines (Apicomplexa): Selenidium spp. and Lecudina spp". J. Parasitol. 89 (6): 1191–205. doi:10.1645/GE-3155. PMID 14740910.

This Apicomplexa-related article is a stub. You can help Wikipedia by .

[Jeon2007-1] Jeon, Kwang W. (2006). International Review Of Cytology: A Survey of Cell Biology. Academic Press. ISBN 978-0-08-046350-6.

[Leander2008-2] Leander BS (February 2008). "Marine gregarines: evolutionary prelude to the apicomplexan radiation?". Trends Parasitol. 24 (2): 60–7. doi:10.1016/j.pt.2007.11.005. PMID 18226585.

[Leander2003-3] Leander BS, Harper JT, Keeling PJ (December 2003). "Molecular phylogeny and surface morphology of marine aseptate gregarines (Apicomplexa): Selenidium spp. and Lecudina spp". J. Parasitol. 89 (6): 1191–205. doi:10.1645/GE-3155. PMID 14740910.

[1]

[2]

[3]