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.
Metatarsalgia is a general name given to pain in the front part of your foot under the heads of your metatarsal bones. This is the area on the sole of your foot, just before your toes. It is sometimes called the ball of your foot. Metatarsalgia can be caused by a number of different conditions affecting the foot. Morton's neuroma. 2  This is sometimes called Morton's metatarsalgia. 3  It is a condition that affects one of the nerves that run between the metatarsal bones in the foot (the plantar digital nerves).