Senses
Jumping spiders have eight eyes, the two large ones in the center-and-front position (the anterior-median eyes, also referred to as "principal eyes":51) providing acute vision and housed in tubes in the head. The other six are secondary eyes, positioned along the sides of the carapace and acting mainly as movement detectors.:16 While other spiders can jump, salticids including M. inclemens are the only spiders with good vision,:521 and their main eyes are more acute in daylight than a cat's and 10 times more acute than a dragonfly's. The main eyes focus accurately on an object at distances from approximately 2 centimetres (0.79 in) to infinity,:51 and in practise can see up to about 75 centimetres (30 in).:53 In M. inclemens, the front row of secondary eyes is only slightly wider than the third, whose width is 75% of the width of the carapace at that point.:2
Like other arthropods, spiders have sensors, often modified setae (bristles), for smell, taste, touch and vibration, protruding through their cuticle ("skin").:532-533 Unlike insects, spiders and other chelicerates do not have antennae.
Read more about this topic: Maevia Inclemens
Famous quotes containing the word senses:
“Beauty satisfies the senses completely and at the same time uplifts the soul. That which gratifies the senses is pleasant, and that which uplifts the soul without being sensual in the least is good, true, right, anything you like, but not beautiful.”
—Franz Grillparzer (1791–1872)
“Whether or not his newspaper and a set of senses reduced to five are the main sources of the so-called “real life” of the so- called average man, one thing is fortunately certain: namely, that the average man himself is but a piece of fiction, a tissue of statistics.”
—Vladimir Nabokov (1899–1977)
“Seeing that the Senses cannot decide our dispute, being themselves full of uncertainty, we must have recourse to Reason; there is no reason but must be built upon another reason: so here we are retreating backwards to infinity.”
—Michel de Montaigne (1533–1592)