phylum Cnidaria

Học thuật
Thân thiện
Definition
  1. Noun:
    • A major taxonomic division within the animal kingdom: "phylum Cnidaria" is the scientific name for a large group of aquatic, mostly marine, invertebrate animals. This phylum is characterized by radial symmetry, a simple body plan with a single internal cavity, and specialized stinging cells called cnidocytes.
    • The group containing jellyfish, corals, sea anemones, and hydras: The term specifically refers to the collective of all these related organisms classified under this taxonomic rank.
Usage Examples
  • Noun:
    • The study focused on the evolutionary history of the phylum Cnidaria.
    • Corals and jellyfish both belong to phylum Cnidaria.
Advanced Usage
  • In taxonomic hierarchy: Used in formal biological classification, positioned below "kingdom" and above "class".
    • The organism was definitively placed within phylum Cnidaria based on its morphological features.
  • Referring to characteristic features: Often used when discussing the defining traits of the group.
    • The presence of cnidocytes is a synapomorphy for phylum Cnidaria.
Variants and Related Words
  • Cnidarian (n): Any individual member or organism belonging to the phylum Cnidaria.
    • The aquarium has a new exhibit featuring various cnidarians.
  • Cnidaria: Often used interchangeably with "phylum Cnidaria," though "Cnidaria" alone can be the formal name of the taxon.
  • Coelenterata: An older, now largely obsolete taxonomic name that was historically used for a group encompassing Cnidaria and sometimes other phyla.
Synonyms
  • Coelenterates (n, historical/contextual): A term sometimes used synonymously, especially in older literature, though its taxonomic scope may differ.
Related Phrases / Terms
  • Cnidocyte (n): The specialized stinging cell that defines the phylum.
    • The cnidocyte is the hallmark cell type of phylum Cnidaria.
  • Radial symmetry: A key anatomical feature of the phylum.
  • Polyp and medusa: The two principal body forms found in the life cycles of many cnidarians.
Noun
  1. hydras; polyps; jellyfishes; sea anemones; corals

Từ đồng nghĩa