How many different spiders are there worldwide? Over 37,000 species of spiders have been described worldwide. They feed on vulnerable insects and plant juices. Harvestmen, or garden daddy-long-legs (Order Opiliones), have three broadly-joined body regions (head, thorax, and a segmented abdomen), one pair of eyes and are non-venomous. Are harvestmen (garden daddy-long-legs) spiders? No. Relatively few spiders are dangerous to humans. Spiders inject venom and/or digestive juices into live or recentIy-killed prey in order to feed. Are all spiders poisonous? Yes - to their prey! All spiders have a pair of poison glands with ducts that supply venom to the hollow jaws (chelicerae).
Spider Facts: Frequently Asked Questions How do spiders differ from other arthropods? All spiders have two body regions (cephalothorax and unsegmented abdomen), eight legs (each with seven segments), a pair of pedipalps, a pair of chelicerae (jaws) and either six or eight simple eyes.
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