Complicated aberration involving both arms of the second chromosome (location 40 and 47) and third chromosome (location 66-67 and 81).
Lateral branches of aristae reduced, greatest degree of reduction is observed on the upper lateral branches. Central stem of the arista often show some structural abnormalities. Wings have small transparent spots at their distal ends (absence of the wing hairs).
Lateral branches of aristae reduced, especially branches extending upward from central axis and situated at base of arista. Axis of arista often abnormal. Wings have small transparent spots distally. RK2A.
Heterozygous viability and fertility comparatively high.