subclass Actinopoda

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Definition

Noun A taxonomic subclass within the class Actinopoda, comprising certain protozoans characterized by having axopodia (slender, radiating pseudopodia supported by microtubules). The group primarily includes heliozoans and radiolarians, organisms often found in aquatic environments.

Usage

The term is used in scientific classification (taxonomy) and biology to refer to this specific grouping of protists. * Early taxonomic systems placed both heliozoans and radiolarians within the subclass Actinopoda. * The defining feature of organisms in the subclass Actinopoda is the presence of axopodia used for capturing food.

Advanced Usage
  • In modern phylogenetic classifications based on genetic data, the grouping "Actinopoda" or "subclass Actinopoda" is considered polyphyletic and is less commonly used. The organisms are now often classified into separate groups (e.g., Radiolaria and Heliozoa within the supergroup Rhizaria).
Variants and Related Words
  • Actinopoda (n): The class-level taxonomic rank containing this subclass.
  • Heliozoan (n): A common name for organisms within this group, often called "sun animalcules" due to their spherical shape and radiating axopodia.
  • Radiolarian (n): A common name for marine organisms within this group, known for their intricate siliceous skeletons.
Synonyms
  • Actinopod protozoans (descriptive synonym)
  • Axopod-bearing protists (descriptive synonym)
Related Phrases
  • Taxonomic rank: A level in the hierarchical biological classification system (e.g., kingdom, phylum, class, subclass, order).
Noun
  1. heliozoans; radiolarians

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