Embryos derived from fafB4/fafB5 females mated to wild-type males show modest ventralisation of the cuticle, with a herniated head, poorly developed Filzkorper and slightly extended ventral cuticles.
Embryos derived from fafB3/fafB5 females mated to wild-type males show almost complete ventralisation of the cuticle. The rudimentary cuticle contains one anterior denticle belt that fully encircles the embryo.
Eyes roughened due to abnormalities in the hexagonal facet array: but only 1% of facets are affected. Ovaries of homozygous females are normal in appearance but the embryos produced never form syncytial blastoderm and all fail to hatch.