Insect Photoreceptor: An Internal Ocellus Is Present in Sphinx Moths

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Science  27 Aug 1971:
Vol. 173, Issue 3999, pp. 822-823
DOI: 10.1126/science.173.3999.822


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.