Archigregarinorida
| Archigregarinorida | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota |
| (unranked): | SAR |
| (unranked): | Alveolata |
| Phylum: | Apicomplexa |
| Class: | Conoidasida |
| Subclass: | Gregarinasina |
| Order: |
Archigregarinorida Grassé & Schrével 1953 |
| Families | |
The Archigregarinorida are an order of parasitic alveolates in the phylum Apicomplexa. Species in this order infect marine invertebrates — usually annelids, ascidians, hemichordates and sipunculids.
This order was redefined by Levine in 1971.
The order currently consists of 76 species in two families — Exoschizonidae and Selenidioididae.
The family Exoschizonidae contains one genus — Exoschizon — which has one species.
The family Selenidioididae has six genera: Filipodium with 3 species, Merogregarina with one species, Meroselenidium with one species, Platyproteum with one species, Selenidioides with 11 species and Veloxidium with one species.
DNA studies suggest that the archigregarines are ancestral to the other gregarines.Phylogenetic analysis suggests that this group is paraphyletic and will need division. The Neogregarinorida appear to be derived from the Eugregarinorida.
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Wikipedia