Mazon Creek Fossil Fauna
Arthropods
Spider-like Arachnids
Beginning with scorpions, the evolution of terrestrial arachnids has been continuing for at least 400 million years, though exactly when the first arachnids became fully terrestrial is still under debate. Arachnids underwent a rapid early radiation, and today, there are 40,700 described spider species alone.
Paratarbus carbonarius
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Phalangiotarbus lacoei
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Architarbus rotundatus
Anthracomartids
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