Cidaroida

Cidaroida

[‚sid·ə′rȯi·də]
(invertebrate zoology)
An order of echinoderms in the subclass Perischoechinoidea in which the ambulacra comprise two columns of simple plates.
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Subclass Cidaroidea Order Cidaroida Family Cidaridae Genus Prionocidaris AGASSIZ, 1863 Prionocidaris sismondai (MAYER) P1.
The Cidaroida (Echinodermata: Echinoidea) of Antarctica and the Southern Oceans.
Orden Cidaroida Claus, 1880 Familia Cidariidae Gray, 1825 Genero Eucidaris Pomel, 1883 Eucidaris thouarsii (valenciennes, 1846) Orden Diadematoida Duncan, 1889 Familia Diadematidae Gray, 1855 Genero Diadema Gray, 1825 Diadema mexicanum (A.
The orders Cidaroida and Temnopleuroida (each distinct clades) contain the great majority of regular echinoid species known or inferred to have pelagic, nonfeeding larvae (40 of 51 species) and the Cidaroids contained 13 of the 15 known brooding species.
Extant echinoids are divided into two major sister clades, the Cidaroida and the Euechinoida.