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Spectral sensitivity of the compound eyes in the purple land crab gecarcinus lateralis freminville






Biological Bulletin (Woods Hole) 173(2): 398-406

Spectral sensitivity of the compound eyes in the purple land crab gecarcinus lateralis freminville

The spectral sensitivities (S(.lambda.)) of dark-adapted compound eyes of the purple land crab Gecarcinus lateralis possess a broad maximum in the blue-green, 420-530 nm, when measured by electroretinographic (ERG) techniques. Selective adaptation experiments showed large changes in sensitivity but did not isolate different receptor types. A photopigment with maximal absorption at 487 nm was identified in the rhabdoms by microspectrophotometry. Besides the presence of a dominant green receptor system, the existence of a hump in the short wavelength region in S(.lambda.) suggests the presence of a blue-sensitive system as well. It is hypothesized that two photopigments (P487 and P440) in conjunction with screening pigment(s) mediate broad visual maximum in the blue-green in the purple land crab.

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Accession: 006459896

DOI: 10.2307/1541552



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