Mataco-Guaicuru languages

Mataco–Guaicuru
(controversial)
Geographic
distribution:
South America
Linguistic classification: Mataco-Guaicuru
Subdivisions:

Mataco-Guaicuru or Macro-Waikurúan is a hypothetical language phylum consisting of the Guaicuruan, Matacoan, and sometimes Mascoian and Charruan language families. They are spoken in Argentina, Brazil, Paraguay, and Bolivia.

References

http://www.ethnologue.com/show_family.asp?subid=90645

http://www.loc.gov/marc/classification/ddc06.html