develops from capable of photoreceptor eyelet FBbt:00005739 fly_anatomy.ontology H-B eyelet Hofbauer-Buchner eyelet VFB:FBbt_00005739 Cluster of four extra-retinal Rh6-expressing, green-light sensitive photoreceptor cells located between the eye and the optic lobe (Jean-Guillaume and Kumar, 2022). It is found beneath the basement membrane, at the posterior margin of the compound eye, near to the equator. There is one of these on each side (Jean-Guillaume and Kumar, 2022). It is derived from the Rh5-expressing cells of the larval Bolwig organ, which switch their rhodopsin expression during pupal development (Jean-Guillaume and Kumar, 2022). It participates in entrainment of the molecular clock (Jean-Guillaume and Kumar, 2022). Bolwig organ internal sensillum adult head sensillum anterior ectoderm derivative detection of light stimulus involved in visual perception