You know many of them as spiders. Like other arthropods, the arachnids have a hard exoskeleton and jointed appendages for walking. Unlike other arthropods, arachnids do not have antennae.
Common arachnids are the spider, scorpions, ticks and mites.
The Animal Kingdom Web Links Science Main Index Spiders have 8 appendages. The first pair are used for holding the prey and feeding. The second pair may also be used for holding and killing their prey. The others are used as legs for walking. Most spiders also have 8 eyes.