Spectral sensitivity of the ocelli derived from ERG recordings. (A) Mean spectral sensitivity (± standard deviation) of the median (M, solid lines, open squares, n = 12) and the left ocellus (L, broken lines, open diamonds, n = 12) under dark-adaptation (black) and light-adaptation with bright long-wavelength (LW) illumination (grey). The similarity between the two ocelli in peak sensitivity and in the shape of the curves is evident. (B) Pooled spectral sensitivity data of both ocelli (mean value ± standard deviation, n = 24) under dark-adaptation (black triangles) and LW-adaptation (grey triangles) are well fitted by templates for the α-band of an 11-cis retinal visual pigment. The template formulae developed by Stavenga (solid lines) and Govardovskii (broken lines) yield peak absorbances at 511 nm and 510 nm for the dark-adapted state and 348 nm and 351 nm for the LW-adapted state, respectively.
Henze et al. BMC Evolutionary Biology 2012 12:163 doi:10.1186/1471-2148-12-163