Fig. 6. Structure of the posterio-median eye of Drassodes cupreus. (A) Tangential section (light micrograph; scale bar, 1µm) through the retina of the PM eye revealing a regular rhabdomeral arrangement. (B) Electron micrograph of the boxed region in A, showing the parallel microvillar arrangement found over the bigger part of the retina. Scale bar, 500nm. (C) Drawing of the ‘canoe-shaped tapetum’ and the retina, with one possible path of light through the eye (arrow). The front end of the eye is cut off to expose interior structures. Modified from (Dacke et al., 1999.)