different between cystidean vs cystoidean

English

Cystidea +? -an

cystidean (plural cystideans)

(zoology, obsolete) Any of the Cystidea, a class of extinct echinoderms now known as the Cystoidea.
(zoology) A stage in the development of many crinoids after the free-swimming larva attaches to a surface, but before it develops the structures necessary to feed.

From cystoid +? -ean.

cystoidean (plural cystoideans)

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