Homozygous embryos show variable heart defects; in some embryos the heart tube shows multiple breaks, in others the heart tube is complete, but is detached from its anterior and posterior anchoring point in the epidermis.
Class IV allele: mutants lack all head and ventral cuticle, and show segmental defects in lateral epidermis or dorsal and lateral epidermis. In germ-line clones, no eggs are recovered.