As you would expect, the first shelled organisms acquired a shell in small steps, forming tiny (less than 1 mm) hard parts nicknamed "little shellies" or "small shellies."
Source: wiktionary
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As you would expect, the first shelled organisms acquired a shell in small steps, forming tiny (less than 1 mm) hard parts nicknamed "little shellies" or "small shellies."
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.