calypter

1. (biology, entomology) Either of two rounded lobes at the posterior base of the wing in many true flies.Examples: "The acrosticals are irregularly paired, with numerous accessory setulae between the rows; the lower calypters protrude distinctly beyond the margin of the upper;[…]."; "The wings are hyaline and slightly smoky yellowish, while the calypters and wing fringes are pale yellowish (Steyskal, 1980)."; "Traditionally this taxon^([Schizophora]) is subdivided into Calyptratae and Acalyptratae, based respectively on the strong or reduced development of the lower calypter."