Spiders and Insects
The first thing to learn is that spiders are not insects. Spiders have eight legs, while insects havesix legs. There are a number of other differences too.
Spiders belongs to the class Arachnida while insects are found in the class Insecta.
Characteristics that distinguish spiders from insects are listed below:
Spiders don't have antenna like insects.
Spiders don't have wings at all. This is also true for some insects, but there are plenty of insects out there with either two or four wings.
Unlike the abdomen of insects, the abdomen of spiders isn't segmented.
Insects have three pairs of legs. Spiders have eight legs.
Spiders have eight simple eyes, while insects have two more advanced, compound eyes.