Horolodectes sunae is a long-extinct eutherian mammal species of uncertain taxonomic position, recently discovered in Paleocene formations in northern Alberta, Canada. Its name means "hourglass biter" in Greek, because of the shape of its teeth.
Scott C.S, Webb M.W. and Fox R.C. (2005). "Horolodectes sunae an enigmatic mammal from the Late Paleocene of Alberta, Canada". Journal of Paleontology 1009–1025. abstract