A taxonomic group of marine animals (now largely obsolete) characterized by the presence of cup-shaped or calyx-like structures in their body organization.
Combines Greek kalyx (cup) with zoa (animals, plural of zoon). This term emerged in 18th-19th century marine biology to classify organisms with distinctive cup-shaped body parts.
Scientists once sorted ocean creatures by their obvious body parts before they could look inside—imagine classifying animals mainly by 'has cup-shaped thing' versus 'doesn't have cup-shaped thing!' It seems simple now but was brilliant taxonomy then.
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