1. Arendt, D., Technau, U. and Wittbrodt, J. (2001). Evolution of the bilaterian larval foregut. Nature409, 81-85.
2. Arendt, D. and Wittbrodt, J. (2001). Reconstructing the eyes of Urbilateria. Philos. Trans. R. Soc. London Ser. B Biol. Sci.356, 1545-1563.
3. Bartolomaeus, T. (1992). Ultrastructure of the photoreceptors in the larvae of Lepidochiton cinereus (Mollusca, Polyplacophora) and Lacuna divaricata (Mollusca, Gastropoda). Microfauna Marina7, 215-236.
4. Brown, N. L., Kanekar, S., Vetter, M. L., Tucker, P. K., Gemza, D. L. and Glaser, T. (1998). Math5 encodes a murine basic helix-loop-helix transcription factor expressed during early stages of retinal neurogenesis. Development125, 4821-33.
5. Bullock, T. H. and Horridge, G. A. (1965). Structure and Function in the Nervous System of Invertebrates. San Francisco, London: Freeman.