There is wide variation in the reported phonology of Tlapanec, including from the following sources: • Weathers (1984) on the Malinaltepec variety • Carrasco Zúñiga & Weathers (1988) and Black (2004) on the Malinaltepec variety • Marlett & Weathers (2018) on multiple varieties • Marlett & Neri Remigio (2020) on the Acatepec variety
Vowels According to and , in addition to lengthening and nasalization, vowels may also be
glottalized; they can be any combination of the three (lengthened, nasalized, glottalized).
Consonants According to , the
retroflexion (
subapical articulation) of the voiceless postalveolar fricative varies, being before , fluctuating between ~ before , retaining slight retroflexion before consonants, and fully retroflexed elsewhere. Also according to , Allophones of the sounds include . In the existence of the cluster , an allophone may be heard.
Tones Tones differ based on variety. == Orthography ==