Biology:Heliomonadida

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Short description: Order of single-celled organisms

Heliomonadida
Algen I. (Schizophyceen, Flagellaten, Peridineen) (1910) (17950796051)-9+10+11.jpg
Heliomorpha mutans (= Dimorpha mutans), fig. 9-11
Scientific classification e
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
  • Heliomorpha Cavalier-Smith & Bass 2009
  • Tetradimorpha Hsiung 1927

The Heliomonadida[1] (formerly Dimorphida[2]) are a small group of heliozoan amoeboids that are unusual in possessing flagella throughout their life cycle.

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

  1. 1.0 1.1 "Phylogeny of novel naked Filose and Reticulose Cercozoa: Granofilosea cl. n. and Proteomyxidea revised". Protist 160 (1): 75–109. February 2009. doi:10.1016/j.protis.2008.07.002. PMID 18952499. 
  2. "The twilight of Heliozoa and rise of Rhizaria, an emerging supergroup of amoeboid eukaryotes". Proc. Natl. Acad. Sci. U.S.A. 101 (21): 8066–71. May 2004. doi:10.1073/pnas.0308602101. PMID 15148395. 

Wikidata ☰ Q5705752 entry