Here are some USGS Web pages with more information on arachnids and Anywhere:
Insects, arachnids, & annelids
Website for links to USGS and non-USGS websites with information on insects, arachnids, and annelids suitable students arranged by grade levels.
(Score: 1.000)
Definition:
Any terrestrial chelicerates belonging to the class Arachnida, (such as spiders, scorpions, mites, and ticks), characterized by the presence of one pair of preoral appendages with two to three joints. [Glossary of Geology, 4th ed.]