A taxonomic classification or grouping of sea urchins characterized by their flattened, shield-shaped body structure; an alternative taxonomic designation.
Similar to 'clypeastridea,' this is a taxonomic term derived from 'Clypeaster' with the suffix '-ina,' a common taxonomic ending used to denote subgroups or families of organisms.
Scientists sometimes use slightly different names for the same groupings—'clypeastrina' and 'clypeastridea' refer to closely related or identical taxonomic categories, showing that even scientific naming isn't always perfectly standardized.
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