Atatláhuca–San Miguel Mixtec is a diverse Mixtec language of Oaxaca.
Egland & Bartholomew[2] found six dialects (with > ≈80% internal intelligibility) which had about 70% mutual intelligibility with each other: Ethnologue notes that two additional varieties Egland & Bartholomew had not looked at, Sinicahua [xti] and Tijaltepec [xtl], are about as similar.