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hemichordate

Line breaks: hemi|chord¦ate
Pronunciation: /hɛmɪˈkɔːdeɪt
 
/
Zoology

Definition of hemichordate in English:

noun

A marine invertebrate of the phylum Hemichordata; an acorn worm.
Example sentences
  • The molecular phylogeny does agree in one respect with the morphological one in that there are close similarities between the larvae of hemichordates (acorn worms and pterobranchs) and some echinoderms.
  • Unfortunately, a change in the genetic code of the mitochondrial genome in both enteropneusts and echinoderms strongly rejects chordate affinities of the hemichordates.
  • Size comparisons between living and extinct hemichordate zooids are not conclusive evidence, however, as it is easy to imagine a small, hypothetical, zooid that possessed multiple tentaculated arms.

adjective

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Relating to or denoting hemichordates.
Example sentences
  • Evidence for the hemichordate affinity of the extinct graptolites has been steadily amassing.
  • The hemichordate sequences always contained considerable support for both hypotheses.
  • They lack two others, the notochord and post-anal tail, hence the name hemichordate.

Definition of hemichordate in:

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