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As of 2019, this family contained over 600 described genera and over 6,000 described species, [1] making it the largest family of spiders – comprising 13% of spider species. [2] Jumping spiders have some of the best vision among arthropods and use it in courtship, hunting, and navigation. Although they normally move unobtrusively and fairly ...
[2] [5] The secondary eyes normally have a light-reflecting layer, the tapetum, that makes the eyes appear pale. [6] The tapetum differs considerably between spider families but can be separated into three main types: PT (primitive type), CT (canoe type), and GT (grate type). Some spiders, such as jumping spiders, have no tapetum in their ...
These spiders, called mirror or sequinned spiders, are all members of several different species of the genus Thwaitesia, which features spiders with reflective silvery patches on their abdomen. The scales look like solid pieces of mirror glued to the spider's back, but they can actually change size depending on how threatened the spider feels.
Photographer Nicky Bay says in his blog describing the mirror spider: "The silver plates on its abdomen seem to shrink when the spider is agitated, or perhaps threatened."
Phidippus audax are commonly referred to as "bold jumping spiders" or "bold jumpers". [8] The species name, audax, is a Latin adjective meaning "audacious" or "bold". [8] This name was first used to describe the species by French arachnologist Nicholas Marcellus Hentz, who described the spider as being, "very bold, often jumping on the hand which threatens it". [9]
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.
Like all other jumping spiders, M. intermedia possesses eyes of differing sizes in anterior, lateral, and posterior positions. [2] The nature of the eye formation and composition has given rise to some of the most elaborate vision-dependent hunting strategies observed in the animal kingdom [ 3 ]
Like other jumping spiders, T. planiceps relies on their very acute eyesight for hunting. The anterior median eyes are the primary eyes used for capture of stationary prey while the anterior lateral eyes are the main eyes used in chasing Both sets of eyes can be coordinated to enable switching from one hunting type to the other. [6]