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Spider only | has eight legs have glands in the abdomen which produce silk that is then exuded through spinnerets jointed legs are joined to the cephalothorax most have eight eyes young are much like a small adult that moult several times as they grow do not have antennae secrete juices that convert prey to a liquid that is sucked, not chewed have a pair of chelicerae that are used to grasp prey when feeding body in two parts, cephalothorax and abdomen breathe through lung-books, tracheae or both |
Insect only | body divided into head, abdomen and thorax head has a single pair of sensory antennae has one pair of compound eyes and an ocelli for seeing three pairs of legs are attached to the thorax may possess wings breathe through tracheae that open at paired spiracles all lay eggs and many types undergo a series of developmental changes called metamorphosis many live in highly structured communities or colonies |
Both insect and spider | have an external skeleton and jointed legs must moult before it can grow has an open circulatory system i.e no blood vessels carry the blood back to the heart, it just sloshes around the body cavity |