Wings broader; bent downward in slight, even arc; edges drawn down to diamond shape. Sometimes in stock, wings are bent upward instead of downward. Crossveins closer together. RK2.
a1 does not show a significant interaction with vriunspecified in double heterozygous combination.
Allelic series of mutations: Df(2R)aEX1 = Df(2R)aEX2 > aEM50 >= ak11011b > aEM1 >= aEM27 > a1 > aEM15.