On colour perception in Calandra oryzae Linnaeus (Coleoptera: Curculionidae).

Abstract

On account of the effect on the duration of thanatosis at the low level of illumination by coloured lights at which even exposure to ordinary artificial light should have had no effect, it appears that Calandra oryzae is able to perceive violet and blue lights. Also exposure to orange light shortened the duration of thanatosis, but since in this case the level of illumination was high, further studies are suggested to determine whether the effect was due to perception of orange light or to the higher level of illumination. These weevils do not appear to perceive green and red lights.