Echinothurioida

Echinothurioida

[‚ek·ə·nō·thu̇·rē′ȯid·ə]
(invertebrate zoology)
An order of echinoderms in the superorder Diadematacea with solid or hollow primary radioles, diademoid ambulacral plates, noncrenulate tubercles, and the anus within the apical system.
References in periodicals archive ?
Part 2, Echinothurioida, Diadematoida and Stirodonta (1, Calycina).