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Mygalomorph Trapdoor Spider,
Kempner, TX 111208, pg 4
 The
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.
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Assembled & Edited by
Jerry Cates. Questions? Corrections? Comments?
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