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Spiders can be found in all environments throughout the entire world except in the air and sea Biology of Spiders RFoelix These invertebrates of the order Aranea are one of the several groups of the Class Arachnida with about thirty four thousand species They range in body size from only a few millimeters in length to almost five inches All are carniverous and have four pair of walking legs one pair of pedipalps and one pair of chelicerae Spiders WShear Each chelicerae consists of a base and a fang The fang folds up inside of a groove in the base until needed when attacking food then moves out to bite and releases venom from a tiny opening at its end as it penetrates the prey Biology Of Spiders RFoelix They are also used to chew getting digestive juices inside the body of the prey then squeezing out the liquid lunch The pedipalps are mainly used to catch and rotate the prey while the chelicerae inject it with poison to tear down the tissue Later the bases of the pedipalps are used as chewing parts The Spider Book JComstock But in males these palps are used to transfer sperm into the female These twleve appendages are attached to a dorsal and a ventral plate the carapace and sternum which cover the entire prosoma and provide attachment points The bodies of spiders consist of two parts an anterior part called the prosoma and a posterior portion called the opisthsoma These two portions are held together by a narrow stalk called the pedicel This narrow junction allows for the spider to be very limber and acts somewhat as a hinge between the prosoma and opisthosoma So as a spider moves foward creating a web it can continue in a straight line throwing its webbing in the direction it chooses This is how spiders create their zig-zag web formations Biology of Spiders RFoelix
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