Athropods with three pairs of legs belong to the class Insecta, whereas those with four pairs belong to the class Arachnida.  Within this class, spiders belong to the order araneae, and harvestmen to the order opiliones.  Unlike the insects, spiders have only two body parts - the head and thorax are fused to form the cepholthorax.  They also have in common poison glands and spinnerettes (to manufacture silk).

Crab Spider (Xysticus cristatus) on auricula flower

Canon EOS 300D and MP-E 65mm, with fill in flash

Jumping Spider (Mopsus penicillatus)

Canon EOS 300D and MP-E 65mm, with fill in flash

Jumping Spider (?sp)

Canon EOS 300D and MP-E 65mm, with fill in flash

wolf spider (Pardosa lugubris)

Canon EOS 300D and 100mm f2.8 macro

Harvestman (Order Opiliones)

Canon EOS 300D and 100mm f2.8 macro


kennethgilpin@lookingcloser.net