amorphic allele - genetic evidence
hypomorphic allele - genetic evidence
lethal
lethal - all die during embryonic stage
some die during embryonic stage
visible
adult abdominal segment
adult thoracic segment
cuticle
head
Abdominal segments resemble the eighth abdominal segment. Thoracic segments are transformed to abdominal segments: not complete transformation as head structures are reduced or absent. Cuticle development is poor.