ALT A figure showing distributed visual systems in a wide range of taxa and configurations. Panel A, a crab spider (family Thomisidae) with eight eyes of two types: the two principal (anterior median, white arrowhead) and six secondary eyes (black arrowhead). Panel B, the chiton Tonicia lebruni, with rows of shell eyes on either side of the body (Image: Julia Sigwart, specimen from California Academy of Sciences). Panel C, the brittle star Ophiomastix wendtii, one of two confirmed examples of non-ocular vision. Panel D, a bee with two lateral compound eyes (black arrowhead) and three ocelli (white arrowhead; image: Sam J. England). Panel E, bright blue reflector eyes of a scallop (Image: Matthew Krummins under Creative Commons). Panel F, a juvenile bullfrog Rana catesbeiana, with lateral (black arrowhead) and parietal eyes (white arrowhead; image: AlphaWolf via WikiMedia Commons). Panel G, a phylogentic tree of showing variable visual system architectures across Metazoa. Black arrows indi