Spectral sensitivity of short-wavelength photoreceptors in female P. rapae crucivora and their localization (arrowheads). a, A UV photoreceptor, peaking at 360 nm (top), identified as the R1 (middle) of a type I ommatidium (bottom). b, A V photoreceptor, peaking at 420 nm (top), identified as the R1 (middle) of a type II ommatidium (bottom). c, A B photoreceptor, peaking at 460 nm (top), identified as the R2 (middle) of a type I ommatidium (bottom). The spectral sensitivity curves are the means (±SE) of six (a), four (b), and four (c) consecutive measurements from single photoreceptors. Scale bar, 10 μm.