The terminal or distal segment of the tarsus; the extreme or tip-most part of the ankle structure or insect leg segment.
From Greek 'akron' (tip) and 'tarsos' (flat surface), describing the outermost extremity of the tarsal region in anatomy or entomology.
In insects, the acrotarsium is where the claws and sticky pads are located—evolution put all the gripping equipment at the very end of the leg for maximum precision and control.
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