The Heliomonadida[1] (formerly Dimorphida[2]) are a small group of heliozoan amoeboids that are unusual in possessing flagella throughout their life cycle.
Heliomonadida | |
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Heliomorpha mutans (= Dimorpha mutans), fig. 9-11 | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Clade: | Diaphoretickes |
Clade: | SAR |
Phylum: | Cercozoa |
Class: | Granofilosea |
Order: | Heliomonadida Cavalier-Smith, 1993 emend. Cavalier-Smith, 2012 |
Family: | Heliomorphidae Cavalier-Smith & Bass 2009 |
Genera | |
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Classification
Genetic studies place them among the Cercozoa, a group including various other flagellates that form filose pseudopodia. This order has recently been placed into the new class of naked filose cercozoans called Granofilosea.[1]There are two genera in this order:
- Heliomorpha, a tiny organism found in freshwater
- the larger Tetradimorpha, which is distinguished by having four rather than two flagella.
Morphology
Bundles of microtubules, typically in square array, arise from a body near the flagellar bases and support the numerous axopods that project from the cell surface.
Dimorphids have a single nucleus, and mitochondria with tubular cristae.
References
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