Hydrozoa

/'haidrə'zouə/
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Thân thiện
Definition
  1. Noun:
    • A class of coelenterates: Hydrozoa refers to a taxonomic class within the phylum Cnidaria. These aquatic animals are characterized by a life cycle that typically involves two distinct body forms: a usually colonial, sedentary polyp stage (hydroid) and a free-swimming medusa stage (jellyfish). Examples include hydras and many types of jellyfishes.
Usage Examples
  • Noun:
    • The biology student studied the life cycle of the Hydrozoa under a microscope.
    • Many Hydrozoa, like the Portuguese man o' war, are known for their powerful stings.
Advanced Usage
  • Scientific Classification: The term is used in formal biological taxonomy. It is often capitalized when referring specifically to the class: .
    • The specimen was identified as belonging to the Hydrozoa.
Variants and Related Words

  • Hydrozoan (noun/adjective): An individual organism belonging to the class Hydrozoa. Also used as an adjective to describe characteristics of this class.

    • Noun: A hydrozoan was observed budding.
    • Adjective: The hydrozoan life cycle is complex.

  • Hydroid (noun): Refers specifically to the polyp, often colonial, stage in the hydrozoan life cycle.

    • The reef was covered with a hydroid colony.
Synonyms
  • Cnidarians (broader term): Hydrozoa are a class within the phylum Cnidaria, which also includes classes like Anthozoa (corals, sea anemones) and Scyphozoa (true jellyfish).
  • Zoophytes (archaic/less precise): An old term for plant-like animals, which sometimes included hydrozoans.
Noun
  1. coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes

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