Chiquihuitlán Mazatec
[también conocido como Mazatec (Chiquihuitlán), Masateko, Mazateco]Clasificación: Otomanguean
·con amenaza de extinción
This link gives a brief overview of Otomanguen groups. It starts out by describing the phonemes and the phonology. Overall it explains the way it is spoken and the patterns that are usually followed.