Number of teeth in primary sex comb reduced from the normal 10 to 1. Bristles intermediate between normal bristles and sex-comb teeth also appear in sex-comb area. Bristle pattern of sx¹ male basitarsus feminized in other respects. RK2A.

Reduces number of teeth in secondary sex comb of en/en male and in primary sex comb of ey^D/+ male. Homozygous females generated from homozygous mei-332 mothers have normal leg chaetotaxy. Structures frequently missing and usually displays bilateral asymmetry; also extra and missing bristles. Homozygous females characteristically lack vulva; thorn bristles on vaginal plate often present as a double row; internal genitalia absent; ovaries small but normal in shape; anal plates reduced or absent.

sx¹/+ reduces the mean number of sex-comb teeth in tra/tra female from 11.37 to 3.7. Sex-comb development autonomous in mosaic from either chromosome loss or somatic crossing over in tra/tra female.

External genitalia greatly modified. Size, shape and arrangement of teeth on clasper varies; occasionally more than one penal apparatus.

Male sterile owing to imperfect development of internal duct system; testes often remain unattached to ducts and are therefore ellipsoidal, but contain fully developed sperm.