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 more abstract the truth you wish to teach, the more you need to seduce the senses to it.”
—Friedrich Nietzsche (1844–1900)
“For certainly he sank into his grave
His senses and his heart unsatisfied,
And made—being poor, ailing and ignorant,
Shut out from all the luxury of the world,
The coarse-bred son of a livery-stable keeper—
Luxuriant song.”
—William Butler Yeats (1865–1939)
“Considered physiologically, everything ugly weakens and saddens man. It reminds him of decay, danger, impotence; it actually reduces his strength. The effect of ugliness can be measured with a dynamometer. Whenever anyone feels depressed, he senses the proximity of something “ugly.” His feeling of power, his will to power, his courage, his pride—they decline with ugliness, they rise with beauty.”
—Friedrich Nietzsche (1844–1900)