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Arachnida Class
This large Class of arthropods includes over 60,000 described species (and most likely a very large number of so-far undescribed ones). Spiders make up the majority of these (around
35,000 described species); with mites and ticks next largest (around 25,000 species). The Arachnida also includes a diverse array of smaller groups, including scorpions (1200 species),
whip spiders (70 species), whip scorpions (100 species), palpigrades (60 species), pseudoscorpions (2000 species), solpugids (900 species), and harvestmen (5000 species). Nearly all
species are terrestrial. [eng]
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Mark M. Lucas Livestock Gallery
Photos: Agamids, Amphibians, Boids, Iguanids, Rat snakes, Skinks and other lizards, Tarantulas, scorpions, and other invertabrates, Tortoises. [eng]
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Arachnid Catalog
List of genera. [eng]
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Arachnida
Tree of Arachnida. [eng]
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Photographic Overview - Arachnids - Scorpions
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Systematics of the Arachnida
The Arachnida include the terrestrial chelicerates that everyone is familiar with, and that nearly everyone would rather not be too familiar with: spiders (Araneae), ticks and mites (Acari),
and scorpions (Scorpiones). Arachnids also include a number of less familiar taxa: Opiliones (harvestmen or daddy-longlegs); Thelyphonida (whip-scorpions); Pseudoscorpiones
(false scorpions); and many others. Most are predators, and some are venomous. All are terrestrial, except for some mites and spiders that have become secondarily aquatic.
[eng]
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Systematics of the Arachnida
The Arachnida include the terrestrial chelicerates that everyone is familiar with, and that nearly everyone would rather not be too familiar with: spiders (Araneae), ticks and mites (Acari),
and scorpions (Scorpiones). Arachnids also include a number of less familiar taxa: Opiliones (harvestmen or daddy-longlegs); Thelyphonida (whip-scorpions); Pseudoscorpiones
(false scorpions); and many others. Most are predators, and some are venomous. All are terrestrial, except for some mites and spiders that have become secondarily aquatic. [eng]
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Lista de Correo: ARACNOLOGIA
Descripción de los pasos a seguir para inscribirse en la lista de correo denominada ARACNOLOGIA del Grupo Ibérico de Aracnología.Gestionada a través de la Comunidad Virtual Universitaria RED IRIS. [spa]
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ARACHNODATA
Information and Coordination Agency for scorpions and other arachnid animals. [eng]
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Arachnida
Books are listed in order by author.
[eng]
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ECORC - Animal Protection Systematics Study (APSS)
This site provides taxonomic and related biological and ecological information about the insects, mites and ticks that affect human and animal health in Canada and North America. [eng]
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