Zoology: General

A Dictionary of Earth Sciences A Dictionary of Zoology Further reading

Euechinoidea

A Dictionary of Earth Sciences | 1999 | | Copyright

Euechinoidea (class Echinoidea) Sub-class of sea-urchins in which the normally rigid test is composed of five ambulacra and five interambulacra, each made up of two columns of plates. The subclass includes both regular types of echinoid (e.g. Hemicidaris) and irregular types (e.g. Clypeus, Micraster). They first appeared in the Upper Triassic.

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

MLA
Chicago
APA

AILSA ALLABY and MICHAEL ALLABY. "Euechinoidea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Euechinoidea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O13-Euechinoidea.html

AILSA ALLABY and MICHAEL ALLABY. "Euechinoidea." A Dictionary of Earth Sciences. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Euechinoidea.html

Learn more about citation styles

Euechinoidea

A Dictionary of Zoology | 1999 | | Copyright

Euechinoidea (subphylum Echinozoa, class Echinoidea) A subclass of sea urchins in which the normally rigid test is composed of ambulacra and interambulacra, made up of two columns of plates. Spheridia are present. The subclass includes both regular and irregular types of echinoid. They first appeared in the Upper Triassic.

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

MLA
Chicago
APA

MICHAEL ALLABY. "Euechinoidea." A Dictionary of Zoology. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Euechinoidea." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O8-Euechinoidea.html

MICHAEL ALLABY. "Euechinoidea." A Dictionary of Zoology. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Euechinoidea.html

Learn more about citation styles