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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).
The outer pair are "secondary eyes" and there are other pairs of secondary eyes on the sides and top of its head. [25] Eyes of the jumping spider, Plexippus paykulli. Spiders have primarily four pairs of eyes on the top-front area of the cephalothorax, arranged in patterns that vary from one family to another. [13]
Spiders do not have compound eyes, but instead have several pairs of simple eyes with each pair adapted for a specific task or tasks. The principal and secondary eyes in spiders are arranged in four, or occasionally fewer, pairs. Only the principal eyes have moveable retinas. The secondary eyes have a reflector at the back of the eyes.
Spiders also have several adaptations that distinguish them from other arachnids. All spiders are capable of producing silk of various types, which many species use to build webs to ensnare prey. Most spiders possess venom, which is injected into prey (or defensively, when the spider feels threatened) through the fangs of the chelicerae. Male ...
A female wolf spider. You can see her two prominent central eyes (she has eight total) and she is dragging an egg sac by her spinnerets.
If mating is successful, the female will begin to lay its eggs [2] and build an eggsack out of silk, which she will use to carry her young in. [10] When the spiderlings are born, they ride on the mother's back until they are old enough to be on their own. Rabid wolf spiders may bite if provoked, but their bite is not dangerous to humans. [2]
[5] [6] [7] However, most of these spiders still need a mostly carnivorous diet to survive, and lab studies have shown that they become unhealthy when fed only plants. [6] One exception is a species of jumping spider called Bagheera kiplingi , which is largely herbivorous, feeding mainly on the sugar rich Beltian bodies produced by acacia plants.
These spiders are brown in color with long legs attached to a body of roughly 9 millimeters in length, Penn State Extension writes. Brown recluse spiders sport three pairs of eyes arranged in a ...