Comparison of Fine Structure of the Compound Eyes in Eucryptorrhynchus scrobiculatus and Eucryptorrhynchus brandti Adults

Eucryptorrhynchus scrobiculatus and E. brandti are the main borers of Ailanthus altissima, causing serious economic ecological losses. The external morphology internal ultrastructure compound eyes two related weevils were investigated with light microscopy, scanning electron transmission microscopy. possess a pair reniform apposition contain about 550 ommatidia per eye. interommatidial angle 7.08 ± 0.31° 4.84 0.49°, respectively. corneal thickness, rhabdom length, ommatidium length significantly greater than those brandti. Under light-adapted conditions, pigment granules mainly distributed at junction cone rhabdom, diameter cross-sectional area middle end is increased in weevil species. dark-adapted shift longitudinally evenly on both sides decreased. discrepancy visual structure beneficial for adaptation to niche differentiation present results suggest that different organ structures perceive information environment.