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Arachnids are arthropods in the class Arachnida (/ ə ˈ r æ k n ɪ d ə /) of the subphylum Chelicerata. Arachnida includes, among others, spiders , scorpions , ticks , mites , pseudoscorpions , harvestmen , camel spiders , whip spiders and vinegaroons .
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Paintings of Araneus angulatus from Svenska Spindlar of 1757, the first major work on spider taxonomy. Spider taxonomy is the part of taxonomy that is concerned with the science of naming, defining and classifying all spiders, members of the Araneae order of the arthropod class Arachnida, which has more than 48,500 described species. [1]
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The microscopic mite Lorryia formosa (). The mites are not a defined taxon, but is used for two distinct groups of arachnids, the Acariformes and the Parasitiformes.The phylogeny of the Acari has been relatively little studied, but molecular information from ribosomal DNA is being extensively used to understand relationships between groups.
The order Trigonotarbida is a group of extinct arachnids whose fossil record extends from the late Silurian to the early Permian (Pridoli to Sakmarian). [1] [2] [3] These animals are known from several localities in Europe and North America, as well as a single record from Argentina.
It is uncertain whether Parasitiformes and Acariformes are closely related, and in many analyses they are recovered more closely related to other arachnids. [ 3 ] [ 12 ] Amongst the best known members of the group are the ticks , though the Mesostigmata is by far the most diverse group with over 8,000 described species, including economically ...
In the first edition, whales and the West Indian manatee were classified among the fishes. Aves comprised the birds. Linnaeus was the first to remove bats from the birds and classify them under mammals. Amphibia comprised amphibians, reptiles, and assorted fishes that are not of Osteichthyes. Pisces comprised the bony fishes.