Arachnids: Spiders, Ticks and Scorpions


Arachnids are a type of arthropod. You know many of them as spiders.

Like other arthropods, the arachnids have a hard exoskeleton and jointed appendages for walking. Unlike other arthropods, arachnids do not have antennae.

Common arachnids are the spider, scorpions, ticks and mites.



See Also:

Invertebrate Animals

Vertebrate Animals

The Animal Kingdom

Web Links

Science Main Index


Spiders have 8 appendages. The first pair are used for holding the prey and feeding. The second pair may also be used for holding and killing their prey. The others are used as legs for walking. Most spiders also have 8 eyes. Spiders have fangs that are used to inject poison to paralyze or kill their prey. Many spiders can produce silk threads to spin webs for catching prey, and for building cocoons for their eggs.

Scorpions are the largest arachnids, some reaching over 8 inches in length. They have 6 to 12 appendages. They also have a sharp stinger at the end of their tail which is used to paralyze or kill insects and small animals.

Mites and ticks are small arachnids that are parasites living on the blood and tissue fluid of other animals. They can occasionally transmit disease.


Web Sites about Arachnids:

Pictures of Spiders from the Australian Museum Online



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