http://www.msnbc.msn.com/id/18042280/
Microbes may have used retinal, not chlorophyll, to harness sun's rays
Purpur Farbe Frühe-Erde, Auge-Evolution
4.11.2005
http://www.bioedonline.org/news/news.cfm?art=1327
Vertebrate and insect vision may have evolved from the same precursor
Auge, Evolution, Insekt, Vertebraten, Platynereis dumerilii,
rhabdomerisch, ziliarisch Photorezeptor
6.5.2010