Shubi language

Shubi is a Bantu language spoken by the Shubi people in north-western Tanzania. It may use labiodental plosives /p̪/, /b̪/ (sometimes written ȹ, ȸ) as phonemes, rather than as allophones of /p, b/. Peter Ladefoged wrote:

We have heard labiodental stops made by a Shubi speaker whose teeth were sufficiently close together to allow him to make an airtight labiodental closure. For this speaker this sound was clearly in contrast with a bilabial stop; but we suspect that the majority of Shubi speakers make the contrast one of bilabial stop versus labial-labiodental affricate (i.e. bilabial stop closure followed by a labiodental fricative), rather than bilabial versus labiodental stop.[3]