Look up: Hemichordata

1. Hemichordata
   Hemichordata (hemikôr"dā'tu) , small phylum of marine invertebrates closely related to both the echinoderms (phylum Echinodermata) and chordates (phylum Chordata). Acorn worms, class Enteropneusta, are the most common hemichordates. The body is composed of an anterior, conical pr...
   Found on http://www.infoplease.com/ce6/sci/A08233
   
   
2. Hemichordata
   Hemichordata is a class of sub-Phylum acrania. They are peculiar marine worm-like creatures.
   Found on http://www.probertencyclopaedia.com/brow
   
   
3. Hemichordata
   Type: Term Pronunciation: hem′ē-kōr-dā′tă Definitions: 1. A phylum composed of soft-bodied, bilaterally symmetric wormlike marine animals with gill-slits to the pharynx and a conical proboscis; a ciliated larval stage resembles that of echinoderms. Synonyms: Hemichorda
   Found on http://www.medilexicon.com/medicaldictio
   
   
4. Hemichordata
   `Hemichordata` is a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms. They date back to the Lower or Middle Cambrian and include two main classes: Enteropneusta (acorn worms), and Pterobranchia. A third class, Planctosphaeroidea, is known only from the ...
   Found on http://en.wikipedia.org/wiki/Hemichordat