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Dinodiplura ambulacra
Exceptional preservation of organisms without hard skeletal parts, like this spider, requires special conditions for fossilization. Spiders appear abruptly in the fossil record. This is a Cretaceous specimen (few cm in size) of Dinodiplura ambulacra from the Crato Formation of Brazil, on display at the Paleontological Museum in Santana do Cariri.
Araripescorpius ligabuei
The body plan of fossil scorpions is not much different from modern ones: an example of morphological stasis. This is a Cretaceous example from the Crato Formation of Brazil. Specimen on display at the Paleontological Museum in Santana do Cariri, few cm in size.