Paedomorphosis in Edirioasteroid Echinoderms
|Title||Paedomorphosis in Edirioasteroid Echinoderms|
|Publication Type||Journal Article|
|Year of Publication||1978|
|Authors||Sprinkle, J, Bell, BM|
Three genera of the echinoderm class Edrioasteroidea comprise the suborder Cyathocystina; each is small, has five short straight ambulacra, few thecal plates, and commonly has a modified peripheral rim with tightly sutured or fused plates. The cyathocystids appear to have evolved by paedomorphosis; they have become sexually mature "adults" while retaining a morphology similar to juveniles of isorophid edrioasteroids. This mode of evolution may have been beneficial in colonizing shallow water, nearshore, current-swept environments.