Pupation delayed until about 168 hr after oviposition, with four days being spent as third instar larvae. Average size of mature wing disk about 56% normal; reduction in size and pattern duplication attributable to extensive cell death in the wing imaginal disk. Wing margins of sd^UCI/Basc females frequently incised; such females also produce significant numbers of patroclinous males.

Extreme vestigial-like wing (as in sd^58d) with erect postscutellar bristles. Halteres greatly reduced in size. In some flies, outgrowths of tissue found on one side of the metanotum; in extreme cases, these outgrowths can be recognized as mirror-image pattern duplications of the notum and ventral hinge and reduction of the wing blade.