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Title: Axodine  
Author: World Heritage Encyclopedia
Language: English
Subject: Actinophryid, Rhizochromulina, Plankton, Bacteriastrum, Coscinodiscophyceae
Collection: Algae Classes, Heterokonts, Planktology
Publisher: World Heritage Encyclopedia


Scientific classification
Domain: Eukaryota
(unranked): Sar
Phylum: Heterokontophyta
Class: Actinochrysea
Cavalier-Smith et al. 1995[1]

   Actinosphaerium Rhizochromulinales    Rhizochromulina
Florenciellales    Pseudochattonella

  • Actinochrysophyceae Mikrjukov & Patterson, 2001
  • Axodines Patterson, 1994
  • Dictyochophyceae Silva, 1982

The axodines (Actinochrysea, Actinochrysophyceae or Dictyochophyceae)[2] are a group of unicellular heterokont algae, previously classified in the Chrysophyceae.[3]

They include pedinellids, silicoflagellates, and Rhizochromulinales.[2]


  • Characteristics 1
  • Classification and history 2
    • Order Dictyochales 2.1
    • Order Pedinellales 2.2
    • Order Rhizochromulinales 2.3
  • References 3


They characteristically have a single emergent flagellum, which lacks the root structure found in related groups, and is extended into a wing-like form supported by an internal rod. They also have tentacles or axopods supported by triads of microtubules, arising from the surface of the nucleus.

Classification and history

Order Dictyochales

The most notable group is the silicoflagellates, marine plankton that form siliceous skeletons and are well known as fossils.

Order Pedinellales

Most other axodines form a group variously called the pedinellids or actinodines.

Order Rhizochromulinales

In addition to the silicoflagellates and actinodines, the marine amoeboid Rhizochromulina marina is included here based on the structure of its zoospores. It is considered closer to the latter group than the former.


  1. ^ Cavalier-Smith T., Chao E. E., Allsopp M. T. E. P. (1995) Ribosomal RNA evidence for chloroplast loss within Heterokonta: pedinellid relationships and a revised classification of ochristan algae. Arch. Protistenkd. 145: 209-220.
  2. ^ a b Mikrjukov K.A., Patterson D.J. (2001) Taxonomy and Phylogeny of Heliozoa. III. Actinophryids. Acta Protozoologica 40: 3-25
  3. ^ Sandgren, C.D.; Smol, J.P.; Kristiansen, J. (1995). Chrysophyte Algae: Ecology, Phylogeny and Development. Cambridge University Press. p. 49.  
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