[1] Testacea species are specialist mushroom-feeding flies, and can metabolize toxic compounds in Amanita mushrooms.

[2] The Testacea species group is studied for its specialist ecology, population genetics, and bacterial endosymbionts.

[3][4][5] Of note, selfish X chromosomes (a form of meiotic drive) have been discovered in three of the four Testacea group species.

[8] The species D. testacea and D. neotestacea of the Testacea species group can be identified based on the presence or absence of an upward turn on the presutural seta of the mesonotum (anterior dorsal thorax).

This article related to members of the fly family Drosophilidae is a stub.