actinopoda

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actinopoda

A student observes an actinopoda under a microscope.

Definition
  1. Noun:
    • A taxonomic subclass of protozoans: "Actinopoda" is a scientific term referring to a subclass within the phylum Sarcodina, characterized by having slender, radiating pseudopodia (temporary projections of cytoplasm) used for movement and feeding. The group primarily includes heliozoans and radiolarians.
Usage Examples
  • Noun:
    • The marine sediment sample was rich in the siliceous shells of Actinopoda.
    • Under the microscope, the biologist observed several members of the Actinopoda, noting their axopodia.
Advanced Usage
  • The term is almost exclusively used in formal biological, paleontological, or microbiological contexts to classify certain protists.
  • It is often encountered in scientific literature discussing plankton diversity or microfossils.
Variants and Related Words
  • Actinopod (n): An individual organism belonging to the subclass Actinopoda.
    • A radiolarian is a type of actinopod.
  • Heliozoan (n): A type of actinopod, typically freshwater, often called "sun animalcules" due to their spherical shape and radiating pseudopodia.
  • Radiolarian (n): A type of marine actinopod with intricate mineral skeletons, usually made of silica.
Synonyms
  • Ray-footed protozoans: A descriptive synonym referencing their characteristic radiating pseudopodia.
Notes on Meaning
  • The term is highly specialized. In non-scientific contexts, the common names for its members (e.g., radiolarians, heliozoans) are used instead of "Actinopoda."
actinopoda

A student observes an actinopoda under a microscope.

Noun
  1. heliozoans; radiolarians

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