Levi, Herbert W. Museum of Comparative Zoology, Agassiz Museum, Harvard University, Cambridge, Massachusetts.
Last reviewed:October 2019
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The largest class of the subphylum Chelicerata in the phylum Arthropoda. Most familiar of the included orders in the class Arachnida are the spiders (Fig. 1), scorpions (Fig. 2), harvestmen, and mites and ticks. Members of the class Arachnida (arachnids) are mainly terrestrial and may be the oldest of the Holocene (Recent) terrestrial animals; scorpions are known from the Silurian (more than 400 million years ago). See also: Arthropoda; Chelicerata
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