hemichordate


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Related to hemichordate: Hemichordata

hemichordate

(hĕm′ĭ-kôr′dāt′, -dĭt)
n.
Any of various wormlike marine animals of the phylum Hemichordata, having gill slits and a structure similar to a notochord.

hem′i·chor′date adj.

hemichordate

any small wormlike marine animal of the subphylum Hemichordata or Enteropneusta, a division of the PROTOCHORDATES that contains worm-like forms such as Balanoglossus.
References in periodicals archive ?
The tubes provide a key missing link that connects the two main hemichordate groups.
Although the two phyla appear quite different today, chordates are often linked with the hemichordates and another dissimilar phylum, the echinoderms, which include starfish.
2009), and the rnicroRNA analysis included only three hemichordate lineages.
A 95% majority rule consensus tree for hemichordates (40 million generations) was constructed from concatenated, but unlinked nucleotide sequences (with no regions excluded) in MrBayes 3.
This inquiry was not an effort to illuminate phylogeny but merely to determine which of the well-studied animals have sequences most similar to those of this hemichordate.
Isolation of Hox and Parahox genes in the hemichordate Ptychodera flava and the evolution of deuterostome Hox genes.
It thus appears that a dipleurula-type larva with single ciliary band topology, as seen in the holothuroid auricularia and the hemichordate tornaria, is a basal feature of the Ambulacraria.
Feeding rate in a deposit-feeding hemichordate was strongly correlated with sediment chlorophyll a concentrations (Karrh and Miller, 1994).
Until now, the earliest deuterostomes scientists have discovered were between 510 and 520 million years old, when they had already begun to diversify into vertebrates, sea squirts, echinoderms such as starfish and sea urchins, and hemichordates.
californica), hemichordates (Saccoglossus kowalevskii), echinoderms (Strongylocentrotus purpuratus), and some vertebrates (see Table 2 for GenBank sequence accession numbers for the data in Fig.