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Urochord (Noun)

Meaning 1

A notochord of a larval tunicate typically confined to the caudal region.

Classification

Nouns denoting animals.

Examples

  • The tunicate larva possesses an exceptionally long urochord compared to its smaller trunk region.
  • During metamorphosis of a larval tunicate, the urochord disappears or is significantly reduced in size.
  • A larval tunicate utilizes its urochord as part of a flexible and mobile structure, in its caudal region, before undergoing transformation to an adult.
  • The muscle bands located within the non-urochord tail, have little developmental interaction with tunicate muscles found near the urochord region.
  • As a larval urochordate matures and reaches its late stage of development, the urochord does not extend much further than its caudal region.

Meaning 2

Primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva.

Classification

Nouns denoting animals.

Examples

  • The simplest chordates are the urochordates or tunicates, with the distinctive larval urochord vanishing in adulthood.
  • A possible explanation could be an advanced ancestor that evolved back into the primitive marine animal again with a distinct larval urochord.
  • The tunicates display a unique larval form displaying a prominent urochord resembling microscopic sausages in photographs.
  • Unlike their advanced descendants, the primitive larvae have several precursors including a notable urochord eventually being absorbed with time.
  • These organisms evolved to produce a tunic covering in the adult and contain striking larval characteristics including a short-lived urochord.

Synonyms

  • Tunicate
  • Urochordate

Hypernyms

  • Chordate

Hyponyms

  • Salpa
  • Larvacean
  • Salp
  • Doliolum
  • Appendicularia
  • Ascidian
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