Calypter

Source: Wikipedia, the free encyclopedia.
A Tachina sp. fly showing white calypters at the base of the wings
Calypter of a Tachinid

A calypter is either of two posterior lobes of the posterior margin of the

halteres.[1]

The lower calypter is the proximal calypter (synonyms: squama (of some authors), tegula) and the upper calypter is the distal calypter (synonym: squamula).[2]

Species of the subsection Acalyptratae are noted for lacking calypters.[3]

References