Definition of hemichordate in English:


Syllabification: hem·i·chor·date
Pronunciation: /ˌhemiˈkôrdāt


  • A marine invertebrate of the phylum Hemichordata; an acorn worm.
    More 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.


Back to top  
  • Relating to or denoting hemichordates.
    More 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.

More definitions of hemichordate

Definition of hemichordate in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day kerf
Pronunciation: kərf
a slit made by cutting with a saw