Mygalomorph Trapdoor Spider, Kempner, TX 111208, pg 4

Eucteniza spp dorsal eyesThe eye cluster of this spider is shown in the midsection of this photo, with the basal chelicerae, in the lower portion of the photo, out of focus. The eyes are arranged in two rows, an anterior (foremost) row nearest the chelicerae, and a posterior (rearward) row behind it. Each row is, by convention, divided into median (midmost) and lateral (outermost) eyes, and are referred to in coded form. Notice the two anterior median eyes (AME) in the center of the face, facing forward and slightly upward. Flanking the AME, the anterior lateral eyes (ALE) face forward, angled to the side. Notice that, in this spider, the posterior eyes form a triangle with the ALE, as the anterior eyes form one with the PME. The posterior median eyes (PME) are brightly reflective. Notice also that the PME face upward, slightly back and toward a point above the centerline of the body. The posterior lateral eyes (PLE) face backward and to the side. This eye arrangement does not provide acute vision, as found in jumping or wolf spiders, but does afford a wide field of view. The lenses are fixed, but the retinas are moveable, so the spider can examine a large expanse of its environment without moving its head. NEXT PAGE ---- PAGE MENU:  1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 *

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