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Different adaptation to visual hunting in 3 ground beetle species of the same genus


, : Different adaptation to visual hunting in 3 ground beetle species of the same genus. Journal of Insect Physiology 31(8): 593-602

Compound eyes and hunting behavior of 3 spp. of the genus Asaphidion de Gozis 1886 [A. pallipes, A. flavipes and A. caraboides] (Coleoptera, Carabidae) were investigated. All 3 have a fovea and binocular overlap in their frontal fields of vision. In the smallest species A. flavipes, the binocular overlap is largest and the foveal interommatidial angles are narrowest. All 3 spp. hunt by visual cues; A. flavipes is the most precise during the approach to the prey and during the attack. The mean size of its approach jerks and its critical distance prior to the attack are shorter than those of A. caraboides, and the scatter of these distances is much smaller. This leads to greater success in capturing fast fleeing prey (Collembola) in the soil surface.

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