Cestmír Loukotka (38) clasifica a las lenguas y dalectos de la Amèrica del Sur en grandes familias o "troncos". En el extremo sur habría cinco troncos: el mapuche, el diaguita, el humahuaca, el lule y el huarpe.
El tronco diaguita poseería 20 dialectos (sin considerar los subdialectos):
"Diaguit -extins language once spoken by many tribes in the Argentine province of Catamarca. All the survivors are now Quechuanized. (J.E. Durand 1931).
Dialects, all extinct:
Quilme - once spoken around the city of Quilmes, Catamarca.
Yocabil - once spoken in the same province oin the Yocabil Valley.
Andalgalá - once spoken around the city of the same name, Catamarca.
Abaucan or Tinogasta - once spoken in the Abaucan Valley, Catamarca.
Pasipa - once spoken in the Vicioso Valley, Catamarca. Ancasti - once spoken in the Sierra de Ancasti, Catamarca.
Hualfin - once spoken in the Hualfin Valley, Catamarca.
Famatina - once spoken in the province of La Rioja in the Famatona Valley.
Caringasta - once spoken in hte Anguco Valley, San Juan province.
Sanagasta - once spoken in the Sierra de Velasco, La Rioja province.
Musitian - once spoken in La Rioja province in the Sierra de los Llanos.
Nolongasta - once spoken in the Chilecito Valley, La Rioja province.
Calchaqui or Cacan or Tocaqui - extinct language once spoken in Salta province, in the Quimivil and Santa María Valleys. (Lafone y Quevedo 1927, pp. 28 - 33; Serrano 1936b, both only a few words and patronyms).
Dialects:
Guachipa - once spoken in the vally of the same name, Salta.
Tolombon or Pacioca - once spoken in the province of Tucumán in the Tolombon Valley.
Amaicha - once spoken in the Sierra de Aconquija, Tucumán province.
Tucumán or Tukma - once spoken around the city of Tucumán.
Solco - once spoken in Tucumán province north of the Tucuman tribe.
Cupayana of Capayana - extict language once spoken in San Juan and La Rioja provinces. (Cabrera 1917, only a few patronyms; Canals Frau 1944b, pp. 147 - 157, the same).
Amaná - once spoken around the city of the same name, La Rioja province. (Nothing).
Chicoana or Pulare . once spoken in Salta province en the Lema Valley. (Nothing).
Indama or Ambargasta - once spoken north of Salinas Grandes, Santigo del Estero province. (Nothing),
Copiapó - once spoken around the city of the same name in the province of Atacama, Chile. (Nothing)." (39).
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(38) Cestmín Loukotka, Clasification of South American Indian Languages,Los Angeles, Johannes Wilbert Editor, University of California, 1968.
(39) C. Loukotka, op. cit., pár. 114.