An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems.
Vogais: yiea
Consoantes: cstd
cystoidea, cystid, cestoidea, cestida, cystoid, cestidae, costia, cysted, cytode, cytoid.