Euechinoidea

(invertebrate zoology) A subclass of echinoderms in the class Echinoidea; distinguished by the relative stability of ambulacra and interambulacra.

A subclass of Echinoidea (sea urchins, sand dollars, and heart urchins) in which the test plates are consistently arranged in double rows or columns. Five double rows bear the tube-feet (the ambulacral rows), and these alternate with five which do not (the interambulacral rows). See also Atelostomata; Diadematacea; Echinacea; Echinodermata; Echinoidea.

Euechinoidea
Scientific classification
Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Subclass: Euechinoidea Bronn, 1860
Families
Aspidodiadematidae Diadematidae Micropygidae Pedinidae Pseudodiadematidae

The subclass Euechinoidea includes almost all living species of sea urchin, and fossil forms going back as far as the Triassic.

This echinoderm-related article is a stub. You can help Wikipedia by expanding it.

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)