Inhibitory effect of ultraviolet rays on the oothecal formation in cockroaches : III. The site of ultraviolet reception

Abstract

In female cockroaches, Periplaneta americana and P. australasiae, ultraviolet rays inhibit the oothecal formation. Morphological manipulation of the head of cockroaches showed that the site of ultraviolet reception was located in the region of antacoria. Light-evoked spike discharges were recorded from that region and the maximal response was obtained at the wavelength of 254nm. These results of structual and functional investigations showed that the site of ultraviolet reception was located at the nerve-cord-like structure under the antacoria.