鱗翅類複眼網膜の比較形態学的考察 : 特にセセリチョウ類の特異性について

概要

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Comparative TEM study was made on the retinas, especially the rhabdoms of 18 species of Lepidoptera. Similarities and differences between species can be correlated in part with their systematic position (butterflies, most moths and hesperiids) and in part with their daily activity cycle (diurnal or nocturnal). In general, the relative cross sectional area occupied by the photoreceptor organelle, the rhabdom, is high in nocturnal species (50-70% of the retinal area) and in the nccturnal moths, the component rhabdomeres are V-shaped in transverse sections. However, the rhabdom is much smaller in diurnal species (1-3% of the retinal area) and in the diurnal butterflies, with the exception of skippers, the rhabdomeres are wedge-shaped in transverse sections. Diurnal moths usually have rhabdom proportions and structure similar to diurnal butterflies. But in skippers, the rhabdoms are relatively large (25% of retinal cross-section area) and rhabdomeres V-shaped, even though they are day-active butterflies. Hesperiid eyes also have two distinctive features. First, they have extensive septate junctions to which the plasma membranes of retinular cells are adjacent. In addition, these junctional areas are expanded radially and show strikingly meandrous outlines in transverse sections.
1978-03-25