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Paedomorphosis in Edirioasteroid Echinoderms

TitlePaedomorphosis in Edirioasteroid Echinoderms
Publication TypeJournal Article
Year of Publication1978
AuthorsSprinkle, J, Bell, BM
JournalPaleobiology
Volume4
Pagination82-88
Keywordsbiology
Abstract
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.
URLhttp://www.jstor.org/stable/2400150