A member of an extinct family of marine snails with well-developed, symmetrical spiral shells from the Paleozoic era.
From Greek eu- (well) + omphalos (navel, center) + -id (member of). The 'navel' refers to the central coil point of their shells.
Euomphalids were some of the earliest successful spiral-shelled snails, and their perfectly coiled shells reveal how evolution optimized the mathematics of growth—nature discovered logarithmic spirals long before humans did.
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