Jumping Spider - Phidippus princeps
Family Salticidae
Live spiders photographed at Ogle County, Illinois.
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Jumping Spider - Phidippus princeps
These little guys love to play hide and seek
Jumping spider vision allows complex communications such as the elaborate courtship dances that males perform. Salticids are perhaps as old and diverse as mammals, though not many humans know their world. Many salticids are colorful, they take on a variety of body forms, and some have disguises, looking like ants and other organisms.

Jumping spiders are small to medium in size, stout-bodied and short-legged, with a distinctive eye pattern. The body is rather hairy (pubescent) and frequently brightly colored or iridescent. Some species are antlike in appearance. The jumping spiders forage for their prey in the daytime. They approach prey slowly and, when a short distance away, make a sudden leap onto the unfortunate animal. They are good jumpers and can leap many times their own body length. [3]

Phidippus johnsoni
This is a final-moult adult male [1]
Jumping spider's anatomical points of interest:
  • Esophagus passes straight through the brain
  • Portion of gut overlies the eyes and brain inside carapace
  • Heart extends from abdomen into cephalothorax
  • Leg muscles attached inside the carapace operate legs like marionette puppets
  • Jumping spider's brain volume to body size proportionate to human, but visual processing region is larger
  • Salticids move retinas inside the eyes to look in different directions, as the lenses are fixed in the carapace
Jumping spider
Male jumping spiders have an unusual method of inseminating their mates: they use the little "feelers" beside the face - in females, these palpi are simple and leg-like; both males and females use them like little hands, to manipulate food and to clean their faces. But adult male palpi are larger and much more complex (that's one way to tell a male spider: adult and sub adult males have the palpi swollen, like boxing gloves).

The male prepares to mate by spinning a small web and depositing a drop of sperm on it from the underside of his abdomen. He then places the tip of the palp into the sperm, and draws the sperm through the palp's opening into the sperm duct where it is stored. He then goes cruising. If he finds a female, he performs a courtship dance for her, during which she assesses his fitness. If she accepts him, he places his palp against an opening on the underside of her abdomen (her epigynum), and guides it into place by putting a thumb-like projection, the tibial apophysis, into a groove in her epigynum. The palpus then expands, locks in place, and injects the sperm. [3]

References
  1. Bugguide.net, Jumping Spider - Phidippus princeps
  2. Jumping Spider Vision David Edwin Hill, licensed under the Creative Commons 3.0 Unported 
  3. Maddison, Wayne. 1995. Salticidae. Jumping Spiders. Version 01 January 1995
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