More than 90% of flies lack the anterior orbital, anterior notopleural, humeral, postvertical, ocellar, presutural, anterior postalar, anterior supraalar, scutellar and posterior postalar bristles. The posterior supraalar bristles are present.
Rather extreme sc allele; slight acHw-1 effect; hairs often removed from abdomen and wings. Homozygous female-sterile and low in viability. Male fertile and fairly viable. RK2A.