Physical Characteristics

Relatively small- to medium-sized spider, with adult female length of 0.20-0.28 in (5-7 mm) and adult male length of 0.20-0.32 in (5-8 mm). Considered one of most common and well-known salticid spiders. Has very acute vision with distinctive eye arrangement of eight simple eyes (three rows of 4, 2, and 2) that enable it to focus in all directions. First median pair of eyes is largest, located on front of cephalothorax, look forward, and called "headlight" eyes. Posterior eyes are smallest in size, located on top of cehalothorax and look upward. Eyes can move in or out for focusing, and can turn up and

H Ricinoides afzelii H Salticus scenicus down, and left and right for 360° eyesight (called "integral binocular vision"). Nuclei of retinal cells of anterior eyes have evolved to side, out of the path of light. Can also turn its carapace more than 45° to look around. Considered to have best vision of any arthropod, especially where anterior median eyes are concerned. When eyes become dirty, they are cleaned with front two legs.

Most distinguishing feature is black body that contains white hairs, which form stripes on abdomen. Male is similar to female but with larger chelicerae, darker body color, and brightly colored brushes on appendages. Cephalothorax contains brilliant hairs, stout body, and rather short legs; eight legs are hairy and covered by sensory hairs (trichobothria). Tracheal system extends into cephalothorax. Abdomen contains digestive system, breathing apparatus, and silk-producing organs. Huge chelicerae are usually hidden behind pedipalps.

Was this article helpful?

0 0

Post a comment