Coleoidea

A Dictionary of Zoology | 1999 | 461 words | Copyright

Coleoidea (phylum Mollusca, class Cephalopoda) A subclass of cephalopods which have one pair of gills. The true shell, if it occurs at all, is internal. The head possesses eyes and a mouth that bears a pair of mandibles and a radula. Eight arms extend from the head. Some forms also have two additional, retractile tentacles. A hyponome is also present. There are four extant orders and one extinct order. The subclass first appeared in the Lower Carboniferous.

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

MLA
Chicago
APA

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

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

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

Learn more about citation styles