Chacopterygus
Chacopterygus is an extinct genus of cimolestid mammal which existed in New Mexico, during the early Paleocene (middle Puercan age). 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. References

Cimolestans
Paleocene mammals
Fossil taxa described in 2011
Extinct mammals of North America
Prehistoric mammal genera