The arthropod group Chelicerata includes animals as diverse as spiders, scorpions, mites, ticks and horseshoe crabs. In addition to these well-known living animals, it includes important extinct groups such as the eurypterids (sea "scorpions"). There are around 75,000 species of chelicerate known, but the total figure is estimated to be nearer 750,000. Chelicerates have adapted to many ways of life, ranging from marine predators to air-breathing parasites, and the group includes the some of the biggest and smallest arthropods. This website serves as an introduction to chelicerate diversity, providing an overview of both living and extinct groups.
(For the purposes of this website the Chelicerata is considered a class within Phylum Arthropoda, although the taxon has been variously treated as a subphylum or even phylum.)
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Author: Tom Harvey
Last updated: 16.11.2003
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