Ticuna–Yuri languages

Tïcuna–Yuri is a small family, perhaps even a dialect continuum, consisting of at least two, and perhaps three, known languages of South America: the major western Amazonian language Tïcuna, the poorly attested and extinct Yurí, and the scarcely known language of the largely uncontacted Carabayo. Kaufman (1990, 1994) argues that the connection between the two is convincing even with the limited information available. Carvalho (2009) presented "compelling" evidence for the family (Campbell & Grondona 2012).

References

Kaufman, Terrence (1990). "Language History in South America: What we know and how to know more". In David L. Payne. Amazonian Linguistics. Austin: University of Texas Press. pp. 13−74. 

Kaufman, Terrence (1994). "The native languages of South America". In Moseley, Christopher; R.E. Asher. Atlas of the world's languages. London: Routledge. pp. 46−76.