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noun
Sea urchins and sand dollars.
synonym: Echinoidea.
is a specific kind of: class.
has as a member: sea urchin | Exocycloida, order Exocycloida | order Spatangoida, Spatangoida.
is a member of: Echinodermata, phylum Echinodermata.
Polish: jeżowce
Find more on class Echinoidea elsewhere: etymology - rhymes - Wikipedia.
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