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Pterobranchia

A Dictionary of Earth Sciences | 1999 | | Copyright

Pterobranchia (phylum Hemichordata) Class of minute, fixed, colonial, deep-sea organisms which secrete an external cuticular skeleton in which they are housed (e.g. Rhabdopleura). Pterobranchs may be the nearest living relatives of the graptolites (Graptolithina). The mesosoma is small but carries one or more pairs of arms bearing tentacles (the lophophores). The metasoma consists of a long stalk (peduncle) by which the individual is attached. The branchial apparatus is rudimentary.

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AILSA ALLABY and MICHAEL ALLABY. "Pterobranchia." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Pterobranchia." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O13-Pterobranchia.html

AILSA ALLABY and MICHAEL ALLABY. "Pterobranchia." A Dictionary of Earth Sciences. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Pterobranchia.html

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Pterobranchia

A Dictionary of Zoology | 1999 | | Copyright

Pterobranchia (phylum Hemichordata) A class, or perhaps a full phylum, of minute, fixed, colonial, deep-sea organisms which secrete an external cuticular skeleton in which they are housed. The mesosoma is small but carries one or more pair of arms bearing tentacles (the lophophores). The metasoma consists of a long peduncle by which the individual is attached. The branchial apparatus is rudimentary.

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Pick a style below, and copy the text for your bibliography.

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MICHAEL ALLABY. "Pterobranchia." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Pterobranchia." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-Pterobranchia.html

MICHAEL ALLABY. "Pterobranchia." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Pterobranchia.html

Learn more about citation styles

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