A taxonomic group of sea urchins resembling clypeasters; a classification of echinoids with a shield-like or flattened body form.
From 'clypeastroid' (resembling clypeaster) with the taxonomic noun suffix '-a,' forming a formal taxonomic category. This is a scientific naming convention used in paleontology and marine biology.
With names like 'clypeastroida,' you can see how taxonomy creates a nested system—start with 'clypeus' (shield), add '-aster' to name a genus, add '-oid' to describe similarity, then add '-a' to make it a formal group, each step adding specificity.
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