Reference

M.J.F. Blumer, L.von Salvini-Plawen, R. Kikinger, Thomas Büchinger (1995): Ocelli in a Cnidaria polyp: the ultrastructure of the pigment spots in Stylocoronella riedli (Scyphozoa, Stauromedusae) – Zoomorphology (Berl.) – 115: 221 - 227.