why is a spider not considered an insect

It's almost time for Halloween, when all self-respecting little ghosts, goblins and ghouls take a special interest in spiders. We saw this little jumping spider (below) on a pink rose. It doesn't look like it could scare anything--except for maybe a sweat bee or hover fly. This year the of Davis, a hands-on science museum located at 3141 5th St. , is taking a special interest in spiders. The center is sponsoring a number of programs on these critters and posted " " on its website. For one thing, many people think spiders are insects. They're not. Both spiders and insects are invertebrates, but spiders are not insects. Insects have a head, thorax and abdomen, and the thorax has three pairs of legs. They also eyes, antennae and mouthparts, the Explorit Science Center website points out. "The entire body is protected by a tough outer covering called an exoskeleton.


Animals that share these characteristics are called insects. The group to which they belong is called the. "
Spiders, as the Explorit Science Center explains, have two main body parts. "The body consists of a combined head and thorax called the cephalothorax, and the abdomen. The cephalothorax has the eyes, mouthparts (no antennae) and four pairs of legs. Animals that share these characteristics include ticks, mites, scorpions and spiders. The group is called the Arachnida. " And speaking of spiders, schooolchildren visiting the on the UC Davis campus occasionally ask to "see the spiders. " The Bohart is an insect museum (although the officials have been known to showcase a few spiders, too. ) Mark your calendar for Saturday, Oct. 27 for the Bohart's public open house from 1 to 4 p. m. in 1124 Academic Surge on Crocker Drive (nearest intersection is LaRue Road. ) This is a pre-Halloween open house and there definitely will be assorted spiders at the insect museum!


Spiders belong to a group of animals called arachnids. Scorpions, mites, and ticks are also part of the arachnid family. Arachnids are creatures with two body segments, eight legs, no wings or antennae and are not able to chew. Many people think that spiders are insects but they are mistaken since insects have six legs and three main body parts.


Most insects have wings. Arachnids belong to an even larger group of animals called arthropods which also include insects and crustaceans (lobster, crabs, shrimp, and barnacles). This is the largest group in the animal kingdom! Approximately 80% of all animals are from this group that would be over a million different species! There are more than 30 000 different species of spiders. All spiders are predators and many will eat other spiders. Scientists have found spiders in amber (Did you watch Jurassic Park? ) that dates back to about 2 million years. Because spider s skeletons are quite small and fragile it is difficult to find whole fossilized spiders.

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