[edit] Classification

Arachnologists are primarily responsible for classifying arachnids. This can be a tedious task due to the sheer number of arachnids in existence. Two species of arachnids may appear virtually identical while two others of the same species may boast very different traits. Often enough, it is only possible to discern two species by dissecting the specimen under a microscope. Although about 40,000 species have been described since Carl Alexander Clerck described the first spiders 250 years ago, estimates vary how many species are as yet undescribed, with some setting the number as high as 200,000. Not only do scientists find new species in the field, but lots of specimens stored in collections are waiting to be described and classified. There are museum collections of spiders already 100 years old, with specimens half macerated and discolored, still not identified. [1]

Because it is much easier to study the morphology of dead spiders than to observe their behavior in the wild, with many species living in very unaccessible places, the study of spider behavior has been much neglected.

[edit] Popular Arachnology

Around 1970 arachnids became popular pets (specifically tarantulas). This prompted sellers and breeders to appoint a second name to each type (known as a common name). Brachypelma smithi for example has become known as the Mexican redknee tarantula ever since it entered the pet trade.