Similar to d. Tarsi four instead of five jointed. Legs short and stocky, owing to failure of joint formation between second and third tarsal segments (Tokunaga and Gerhart, 1976). Femur, tibia and tarsae foreshortened (Tokunaga and Gerhart, 1976; Mikuta, 1979). Probability of joint failure proportional to degree of shortening of second tarsal segment (Tokunaga and Gerhart, 1976). Joint failure phenotype can extend into fj/+ tissue adjacent to fj/fj clones (Tokunaga and Gerhart, 1976). Leg chaetae show irregularities in the relative orientation of sockets and bracts (Held, Duarte and Derakhshanian, 1986). Enhanced by ss^a and ss^aB (Villee, 1945; Mglinetz and Ivanov, 1976) and by pb (Kaurov, Ivanov and Mglinetz, 1978); also influenced by Antp^Ns (Mikuta and Mglinetz). fj ey^D flies have but three tarsal joints (Postlethwait and Schneiderman, 1975). Development similar to that of dachs [Waddington, 1943). Wings shorter and broader with crossveins conspicuously closer together; veins diverge at greater angle (Tokunaga, Michinomae, Sizemore, and Gerhart, 1978). Effect visible in pupal wing (Waddington, 1940). Eyes smaller, ellipsoid, coarse textured; head foreshortened. RK2.

fj¹ has phenotype, non-suppressible by su(Hw)²