Assertion: structure | /r/CapableOf | display non-veined grouped filaments
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text: However, a 2018 study of two small, well-preserved pterosaur fossils from the Jurassic of Inner Mongolia, China indicated that pterosaurs were covered in an array of differently-structured pycnofibres (rather than just filamentous ones), with several of these structures displaying diagnostic features of feathers, such as non-veined grouped filaments and bilaterally branched filaments, both of which were originally thought to be exclusive to birds and other maniraptoran dinosaurs.