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Bats are an example of abrupt appearance in the fossils record, without much subsequent modification of their body plan. This exquisitely preserved and articulated specimen (about 15 cm in size) is on display at the Field Museum of Natural History, Chicago, and comes from Eocene strata of Fossil Lake Basin, Wyoming.
Stasis and plants: specimens of fossil maple leaves and fruit from the Miocene of Oregon. On display at the Field Museum of Natural History, Chicago
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.
This specimen of a fossil wasp comes from Eocene strata of the Fossil Lake (Wyoming) and its body plan is quite similar to modern representatives of this type of organism. On display at the Field Museum of Natural History, Chicago.