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- W1999608001 abstract "Clusters of dark pigmented cells, called putative cerebral extraocular photoreceptors (CEPs), are described in the optic lobes of four ant species: Atta sexdens, Camponotus rufipes, Camponotus crassus, and Pseudomyrmex adustus. Electron-micrographs of CEPs show a central rhabdom-like structure formed by tightly interleaved cells containing shielding pigments, with axons projecting toward the outer optic chiasm. The presence of a great number of mitochondria, nucleolus, and multivesciular bodies suggests that these clusters might be functional extraocular photoreceptors. Although some branches from GABA-like immunoreactive neurones occur near the CEP region, GABA-immunoreactivity was not detected in CEPs. The ant's cephalic cuticle blocks short wavelengths (< 500 nm) and the light transmittance is less than 20% for wavelengths between 500–700 nm. Ant species with both diurnal and nocturnal habits and heightened nocturnal visual sensitivity (A. sexdens and C. rufipes) contain more CEPs than those with diurnal habits and lower visual sensitivity (C. crassus and P. adustus). The reduction of light reaching this putative extra-ocular system could act as a signal for a circadian pacemaker and, as a possible consequence, lead to an increase of nocturnal visual sensitivity of the compound eyes and/or nocturnal locomotor activity, as already observed in the species studied." @default.
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- W1999608001 date "1996-02-01" @default.
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- W1999608001 title "Cerebral extraocular photoreceptors in ants" @default.
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- W1999608001 doi "https://doi.org/10.1016/s0040-8166(96)80041-3" @default.
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