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:
“The only mode of obtaining an answer to these questions of the senses is to forego all low curiosity, and, accepting the tide of being which floats us into the secret of nature, work and live, work and live, and all unawares the advancing soul has built and forged for itself a new condition, and the question and the answer are one.”
—Ralph Waldo Emerson (1803–1882)
“When the mind’s free,
The body’s delicate; this tempest in my mind
Doth from my senses take all feeling else,
Save what beats there—filial ingratitude!”
—William Shakespeare (1564–1616)