1) Alula 2) Squama 1) Alula 
A calypter is either of two posterior lobes of the posterior margin of the forewing of flies between the extreme posterior wing base and the alula, which covers the halteres. The lower calypter is the proximal calypter (synonyms: squama (of some authors), tegula ) and the upper calypter is the distal calypter (synonym: squamula). Species of the su...
One or two small lobes at base of wing, just above haltere
Innermost of the three flap-like outgrowths at the base of the wing in various flies
a membranous flap that is located at the base of the wing in some species of fly.
noun scalelike structure between the base of the wing and the halter of a two-winged fly