'acalyptratae' originates from Greek, specifically the word 'akaluptratos,' where 'a-' meant 'without' and 'kaluptra' meant 'cover.'

'akaluptratos' transformed into the scientific Latin term 'acalyptratae,' used in entomology to describe a group of flies.

Initially, it meant 'without a cover,' referring to the absence of a calypter, and this meaning has largely remained the same in modern usage.