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Basic arrangement of spider eyes, viewed from above. Most spiders have eight eyes, which tend to be arranged into two rows of four eyes on the head region. The eyes can be categorised by their location and are divided into the anterior median eyes (AME), anterior lateral eyes (ALE), posterior median eyes (PME), and posterior lateral eyes (PLE).
Using its eyes to quickly navigate its web, A. labyrinthica is able to detect the plane of polarized light present, and position itself relative to it in order to maintain its orientation. [6] However, being a web building spider, A. labyrinthica does not rely exclusively on visual stimuli for navigation and orientation. [ 7 ]
Six-eyed spiders are spiders that, unlike most spider species, lack the principal pair of eyes, leaving them with only six eyes instead of the usual eight. [1]
Female banded tunnelweb spider eyes occupy around half their head space, whereas males differ, having slightly smaller lateral eyes. [6] Banded tunnelweb spiders are part of the infraorder Mygalomorphae. Mygalomorphs are a relatively ancient kind of spider that have downward pointing fangs, which have been compared to pick axes.
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Females can reach a body length of 22 mm, males up to 15 mm. This species is much darker than others of the same genus. While subadult spiders have a greyish opisthosoma with a marking similar to Segestria senoculata, adults are of a uniform black, sometimes with a green iridescent shine, especially on the chelicerae, [2] which reflect with a striking green.