Cassiduloida

Cassiduloida

[‚kas·ə·də′lȯid·ē·ə]
(invertebrate zoology)
An order of exocyclic Euechinoidea possessing five similar ambulacra which form petal-shaped areas (phyllodes) around the mouth.
References in periodicals archive ?
Superorder Atelostomata Order Cassiduloida Family Echinolampadidae Genus Echinolampas GRAY, 1825 Echinolampas cfr.