FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
Mutant pharate adults show abnormal abdominal development with absence of posterior tergites and external genitalia. In many cases the abdomen has a "deflated balloon" appearance.
Mutant escapers often lack vigour and frequently die within a few days of eclosing. Wing vein L5 fails to extend to the wing margin. The humeral bristles are often bent in mutant adult escapers.