Sea Urchins

Synonyms

Clypeasteroida

Clypeasteroidas

Dollar, Sand

Dollars, Sand

Echinoidea

Echinoideas

Sand Dollar

Sand Dollars

Sand-Dollar

Sand-Dollars

Sea Urchin

Urchin, Sea

Urchins, Sea

Somewhat flattened, globular echinoderms, having thin, brittle shells of calcareous plates. They are useful models for studying FERTILIZATION and EMBRYO DEVELOPMENT.

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