Achromatorida | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Chromalveolata |
Superphylum: | Alveolata |
Phylum: | Apicomplexa |
Class: | Aconoidasida |
Subclass: | Haemosporidiasina |
Order: | Achromatorida |
Suborders and Families | |
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Achromatorida is an order of non-pigmented intraerythrocytic parasitic protozoa belonging to the subclass Haemosporidiasina. The order was created by Jacques Euz茅by in 1988.[1]
The taxonomy of these organisms has been one of some controversy. Weylon in 1926 grouped many of these genera into the genus Babesia - given what is now known about these genera this was probably an error. Agreement on the organisation of these genera probably cannot be regarded as being settled.
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These are minute rounded or pyriform parasites found within erythrocytes, or other circulating or endothelial cells of vertebrates. The parasites reproduce by merogony without oocysts or spores.
The apical complex has a polar ring and rhopteries. A conoid is lacking and most species lack the associated pellicular microtubules. Flagellae are lacking. The trophozoite stage is separated from erythrocyte by single membrane (in the other groups there usually 2 or more). Vectors include ticks and leeches.
It has two suborders:
There are also a number of genera of uncertain placement that have been provisionally included in this taxon:
Elleipsisoma Franca 1912
The family Dactylosomatidae (genera Babesiosoma Jakowski and Nigrelli 1956 and Dactylosoma Labb茅 1894) and the genus Anthemosoma Landau, Boulard and Houin 1969 were transferred to the suborder Eimeriorina by Boulard et al in 1982.
The genus Nicollia Franca 1910 is now regarded as a synonym for Babesia.[2]
The classification of the species in this group is difficult. Over the passage of time several genera have been described only to re classified as being synonoms of previously described genera.
Recognised synonoms of the genus Babesia include:
Recognised synonoms of the genus Nicollia - which is now itself regarded as a synonym of Babesia - include:
Recognised synonoms of the genus Theileria include:
Apiosoma is currently the name of a genus of ciliated protozoa also known as Glossatella. Although this genus is pathogenic to fish it has not related to the parasites in this taxon.
Nuttallia Dall 1898 is a genus of sunset clams (Psammobiidae)
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