Chacopterygus
Chacopterygus is an extinct genus of cimolestid mammal which existed in New Mexico, during the early Paleocene. Its fossils have been recovered from the Nacimiento Formation, San [Juan Basin], New Mexico. It was first named by Thomas E. Williamson, Anne Weil and Barbara Standhardt in 2011 and the type species is Chacopterygus minutus.