In a few cases, amber has preserved spiders' egg sacs and webs, occasionally with prey attached; the oldest fossil web found so far is 100 million years old. Earlier spider fossils come from a few lagerstÃ¤tten, places where conditions were exceptionally suited to preserving fairly soft tissues.
Definition of METATARSAL. : of, relating to, or being the part of the human foot or of the hind foot in quadrupeds between the tarsus and the phalanges that in humans comprises five elongated bones which form the front of the instep and ball of the foot. See metatarsal defined for kids.ADVERTISEMENT. of, relating to, or being the part of the human foot or of the hind foot in quadrupeds between the tarsus and the phalanges that in humans comprises five elongated bones which form the front of the instep and ball of the foot. See metatarsal defined for kids. ADVERTISEMENT.
Metatarsal bones are a group of five longer bones in the foot. In the foot there are small toe nerves between the metatarsal bones. When the head of one metatarsal bone is pressed against another, the small nerve is caught between them and starts to become inflamed, thus causing metatarsalgia. Pain in the ball of the foot, this is the metatarsal region, which is just behind the toes. 2  Pain that can occur near the toes. 3  Pain that increases when walking in bare feet, and even more so when walking on a hard surface.