Yuman–Cochimí languages
Cochimí is no longer spoken as of the late 18th century, and most other Yuman languages are threatened.The dormant Cochimí, attested from the 18th century, was identified after the rest of the family had been established, and was found to be more divergent.The resulting family was therefore called Yuman–Cochimí, with Yuman being the extra-Cochimí languages.Upland Yuman consists of several mutually intelligible dialects spoken by the politically distinct Yavapai, Hualapai, and Havasupai.Mauricio Mixco of the University of Utah points to a relative lack of reconstructible Proto-Yuman terms for aquatic phenomena as evidence against a coastal, lacustrine, or riverine Urheimat.