Urochordata

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Definition
  1. Noun:
    • A subphylum of chordates: Urochordata is a taxonomic group within the phylum Chordata, comprising marine invertebrate animals.
    • Characterized by a notochord in the larval tail: Members of this group possess a notochord (a flexible rod-like structure) only in the tail region during their larval stage, which is typically lost or reduced in the adult form.
    • Commonly known as tunicates or sea squirts: The most familiar members of Urochordata are the tunicates, which are sac-like filter feeders often found attached to underwater surfaces.
Usage Examples
  • Noun:
    • The Urochordata are an important group for studying chordate evolution.
    • Marine biologists collected several specimens belonging to the subphylum Urochordata.
    • Tunicates, a class within Urochordata, have a unique cellulose-like outer covering called a tunic.
Advanced Usage
  • In taxonomic hierarchy: The term is used formally in biological classification.
    • The phylogenetic position of Urochordata suggests a close relationship to vertebrates.
Variants and Related Words
  • Urochordate (n): An individual animal belonging to the subphylum Urochordata.
    • The urochordate's simple body plan belies its complex life cycle.
  • Tunicate (n): A common name for most animals in the Urochordata, referring to their leathery or gelatinous "tunic."
    • The tunicate is a sessile urochordate.
Synonyms
  • Tunicates: The common name for the group.
  • Sea squirts: A colloquial name for many tunicates, referring to their ability to expel water when disturbed.
Noun
  1. tunicates

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