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Enteropneusta

Enteropneusta (acorn worms) A phylum of free-living, elongate, worm-like, burrowing marine animals, formerly included in the phylum Hemichordata, in which the body is clearly divided into a proboscis (protosoma), collar (mesosoma), and trunk (metasoma). The stomochord extends into the proboscis. The branchial apparatus is well developed, consisting of a long, double row of pores strengthened by a cuticular skeleton (thought to be homologous with the pharyngeal gill clefts of Chordata). The nervous system is notoneural. There are many living genera. No fossil examples are known.

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"Enteropneusta." A Dictionary of Zoology. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/enteropneusta

acorn worms

acorn worms See ENTEROPNEUSTA.

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"acorn worms." A Dictionary of Zoology. . Encyclopedia.com. 18 Aug. 2017 <http://www.encyclopedia.com>.

"acorn worms." A Dictionary of Zoology. . Encyclopedia.com. (August 18, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/acorn-worms

"acorn worms." A Dictionary of Zoology. . Retrieved August 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/acorn-worms