Describing insects, especially flies, that lack a small protective flap called the calypter at the base of their wings.
From Greek 'a-' (without) + Latin 'calyptra' (covering), derived from Greek 'kalyptra' (veil or hood). The term evolved in entomology to classify specific wing structures in dipteran insects.
This word reveals how scientists name things by describing what they DON'T have—it's like calling someone 'unhaired' instead of 'bald.' This logical naming system helps entomologists quickly identify thousands of fly species.
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