Homozygotes, hemizygotes and heteroallelic with phoc die as pharate adults. Pupae exhibit transformation of antenna into legs, partial transformation of meso- and metathoracic legs into prothoracic, pattern duplications (presence of a sixth tarsal segment) and deficiencies in the legs (partial claw formation), partial transformation of abdominal segments to a more posterior identity and transformation of parovaria into spermathecae.
Embryos doubly mutant for PscArp.1 and phob show a mild anterior to posterior segmental transformation. There is medial erosion of the ventral setae and ectopic Fell hairs are seen in more than 75% of cases. Approximately 10% of embryos have large cuticular holes.