Nawathinehena is extinct and Arapaho and Gros Ventre are both endangered.[1][2]
Besawunena, attested only from a word list collected by Kroeber, differs only slightly from Arapaho, but a few of its sound changes resemble those seen in Gros Ventre. It had speakers among the Northern Arapaho as recently as the late 1920s.[citation needed]
Nawathinehena is also attested only from a word list collected by Kroeber, and was the most divergent language of the group.[citation needed][3]
Another reported Arapahoan variety is the extinct Ha'anahawunena, but there is no documentation of it.[citation needed]
Classification
The Glottolog database classifies the Arapahoan languages as follows:[4]
^Although Glottolog's name for this branch mentions Besawunena, it is not listed within either of the two langoids or in its own langoid.
References
Goddard, Ives (2001). "The Algonquian Languages of the Plains." In Plains, Part I, ed. Raymond J. DeMallie. Vol. 13 of Handbook of North American Indians, ed. William C. Sturtevant. Washington, D.C.: Smithsonian Institution, pp. 71–79.
Marianne Mithun (1999). The Languages of Native North America. Cambridge Language Surveys. Cambridge: Cambridge University Press.