LYCOS RETRIEVER 
Spiders: Legs
built 647 days ago
Spiders are arthropods called arachnids. All arachnids have 4 pairs of walking legs and fangs (chelicerae) adapted for liquid feeding instead of jaws or other types of feeding structures. Mites and ticks, harvestmen (daddy-longlegs), and scorpions are all arachnids. Spiders are all members of the order Araneae and are distinguished from the other arachnids by two unique features:
Source:
Spiders are predatory invertebrate animals that have two body segments, eight legs, no chewing mouth parts and no wings. They are classified in the order Araneae, one of several orders within the larger class of arachnids, a group which ... contains scorpions, whip scorpions, mites, ticks, and opiliones (harvestmen). The study of spiders is known as arachnology.
Source:
Spiders typically have eight eyes, although some species have a reduced number. The brown spiders have only six, while some cave-dwelling spiders have no eyes at all. Although most spiders have eyes, only one group, the jumping spiders, rely on their eyes to hunt. Other spiders use their eyes to orient when wandering or to detect motion in the initial stages of prey capture. Spiders are equipped with special hairs, mostly on their legs, through which they feel, taste and hear. Even at a distance, spiders can “feel” where their prey is by the displacement of air around these hairs.
Source:
Spiders are easily recognized by the 4 pairs of seven segmented legs and (like all arachnids) have a cephalothorax and abdomen. But unlike scorpions, mites and daddy-long-legs, the cephalothorax and abdomen of the spider are separated by a visible waist or pedicel. The top of the cephalothorax is protected by a shield-like covering called the carapace.
Source:
Spiders occur in a large range of sizes. The smallest, dwarf spiders of the subfamily Erigoninae, are less than 1 mm (about .05 inches) in body length. The largest and heaviest spiders occur among tarantulas, which can have body lengths up to 90 mm (about 3.5 inches) and leg spans up to 250 mm (about 10 inches).[2]
Source:
Spiders and spiderlike animals belong to the class Arachnida. Arachnids differ from most other arthropods in having no antennae. All adult arachnids have four pairs of legs and have no wings. They usually lack mandibles, having instead fang-like mouthparts to pierce and break up prey.
Source:
MORE ABOUT
Legs