title: Insect photoreceptor: an internal ocellus is present in sphinx moths.
abstract: Adult sphinx moths lack external ocelli. In Manduca sexta and other anocellate moths structures homologous to ocelli have been observed. Histological examination of such a structure in Manduca sexta has shown structural similarities to ocelli of other insects. Electrophysiological studies revealed a response to light stimuli stimilar to the electroretinogram of external ocelli. The evidence strongly suggests that the structures are internal ocelli.
authors.forename: J L
authors.initials: JL
authors.lastname: Eaton