ophiurida

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Definition
  1. Noun:
    • A taxonomic order of echinoderms: "Ophiurida" is the scientific name for an order of marine animals commonly known as brittle stars or serpent stars. They are characterized by a distinct central disc and long, slender, flexible arms that they use for locomotion.
Usage
  • The term "Ophiurida" is used almost exclusively in formal, scientific contexts such as zoology, marine biology, and taxonomy.
  • It refers to the entire taxonomic group, not an individual animal. An individual is a "brittle star" or an "ophiuroid."
Examples
  • Noun:
    • The class Ophiuroidea is divided into two main orders: Ophiurida and Euryalida.
    • Fossil evidence suggests that Ophiurida have existed since the early Ordovician period.
    • Researchers are studying the biodiversity of Ophiurida in the deep-sea ecosystem.
Advanced Usage
  • In phylogenetic studies: The classification within Ophiurida is subject to revision as genetic analysis provides new insights into the relationships between different families and genera.
  • In paleontology: The term is used when describing and classifying fossilized brittle stars.
Variants and Related Words
  • Ophiuroidea (n): The class to which the order Ophiurida belongs. It encompasses all brittle stars and basket stars.
  • Ophiuroid (n/adj): (Noun) A member of the class Ophiuroidea; a brittle star. (Adjective) Relating to brittle stars.
    • The ophiuroid fauna of the reef is diverse.
  • Brittle star (n): The common name for animals in the order Ophiurida.
  • Serpent star (n): Another common name, often used for species with particularly long, snake-like arms.
Synonyms
  • Brittle stars (common name)
  • Serpent stars (common name)
Notes on Meaning
  • The term "Ophiurida" has a single, precise scientific meaning. It does not have different everyday meanings, idioms, or phrasal verbs.
  • It is important to distinguish "Ophiurida" (an order) from "Ophiuroidea" (a class). All Ophiurida are Ophiuroidea, but not all Ophiuroidea (e.g., basket stars in the order Euryalida) are Ophiurida.
Noun
  1. brittle stars

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