and Zacatepec; and Lowland Mixe, spoken in San Juan Guichicovi (this language is also known as "Isthmus Mixe").

The following classification is from Wichmann (1995:9).

;Mixe (Oaxacan Mixean)
* North Highland Mixe (Totontepec)
* South Highland Mixe (Tlahuitoltepec)
** Core (Tlahuitoltepec, Ayutla, Tamazulapan)