A class of marine echinoderms that includes crinoids and related extinct forms.
Plural of Latin 'crinoideum,' derived from Greek 'krinon' (lily) plus '-oid' (resembling), with the Latin-style plural ending '-ea' used in scientific taxonomy.
In scientific naming, Crinoidea is the formal class name, using Latin plurals and suffixes to create a universal language that lets biologists from different countries discuss the same creatures without translation.
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