Tailless whip scorpions are neither spiders nor scorpions, but they are considered arachnids, in the class Arachnida. They are an ancient order and are thought to have been roaming around since ...

A subgroup of air-breathing, terrestrial (land) arthropods, spiders are not actually insects but rather belong to the Class Arachnida (a.k.a. arachnid). Besides spiders, other arachnids include ...