Cnidaria

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Definition
  1. Noun:
    • A major taxonomic phylum of aquatic, mostly marine, invertebrate animals: Cnidaria is the scientific name for a phylum of simple aquatic animals characterized by specialized stinging cells in their tentacles. This group includes organisms like jellyfish, sea anemones, corals, and hydras.
Examples of Usage
  • Noun:
    • The phylum Cnidaria includes some of the most beautiful and sometimes dangerous creatures in the ocean.
    • Corals, which belong to Cnidaria, are vital for building coral reefs.
    • The study of Cnidaria helps scientists understand early animal evolution.
Advanced Usage
  • "Cnidarian" (adj/n): Used as an adjective to describe characteristics of this phylum, or as a noun to refer to a member of it.
    • The cnidarian life cycle often includes both a polyp and a medusa stage.
    • A jellyfish is a common type of cnidarian.
Variants and Related Words
  • Cnidarian (n/adj): A member of the phylum Cnidaria; relating to this phylum.
  • Coelenterate (n): An older, less precise term that was historically used synonymously with Cnidaria but sometimes included another phylum (Ctenophora). "Cnidaria" is the preferred modern term.
Synonyms
  • Coelenterates (in historical or broad biological contexts).
Notes on Meaning
  • The defining feature of Cnidaria is the presence of cnidocytes, which are stinging cells used for capturing prey and defense. The body plan is radially symmetrical.
  • The group is divided into major classes, including Anthozoa (corals, sea anemones), Scyphozoa (true jellyfish), Cubozoa (box jellyfish), and Hydrozoa (hydras, some polyps).
Noun
  1. hydras; polyps; jellyfishes; sea anemones; corals

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