phylum Echinodermata

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Definition

Proper noun A major taxonomic rank in biological classification, specifically a phylum within the kingdom Animalia. It comprises exclusively marine invertebrates characterized by a unique combination of features: a calcareous endoskeleton, a water vascular system with tube feet, and (in adults) pentaradial symmetry—a body plan organized in five parts around a central axis.

Usage and Examples

  • Scientific Classification:

    • The study focused on the evolutionary history of phylum Echinodermata.
    • Sea stars, brittle stars, and crinoids are all classes within phylum Echinodermata.

  • Descriptive Context:

    • The unique water vascular system is a defining characteristic of phylum Echinodermata.
    • Fossil records show that phylum Echinodermata has a long and diverse history.
Advanced Usage and Notes
  • The term is used almost exclusively in formal scientific, biological, and zoological contexts. In general communication, the common names for its member classes (e.g., starfish, sea urchins) are used instead.
  • While adults exhibit radial symmetry, the larval stages of organisms in this phylum are bilaterally symmetrical, a key point in understanding their evolution.
Variants and Related Terms
  • Echinoderm (noun): Any member of the phylum Echinodermata.
    • The tide pool was full of various echinoderms.
  • Echinodermal (adjective): Of or relating to the phylum Echinodermata.
    • The researcher studied echinodermal anatomy.
Synonyms and Related Concepts
  • Echinoderms: This is the direct common-name equivalent for the members of the phylum.
  • Marine invertebrates: A broader category that includes phylum Echinodermata along with many other phyla like Mollusca and Arthropoda.
Key Member Classes (Illustrative, not synonyms)
  • Asteroidea: The class containing sea stars (starfish).
  • Echinoidea: The class containing sea urchins and sand dollars.
  • Holothuroidea: The class containing sea cucumbers.
  • Ophiuroidea: The class containing brittle stars and basket stars.
  • Crinoidea: The class containing sea lilies and feather stars.
Noun
  1. radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers

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