Proto-Huon Gulf was reconstructed by Malcolm Ross in 1988 in Proto-Oceanic and the Austronesian Languages of Western Melanesia. It is reconstructed on the basis of shared phonological, morphosyntactic and lexicosemantic innovations relative to Proto-Oceanic, such as the pervasive lenition of Proto-Oceanic *p to *v, the acquisition of a final *-c in some words, the idiosyncratic change of Proto-Oceanic *boRok 'pig' to Proto-Huon Gulf *boR, and the loss of all verb-deriving prefixes such as *pa- 'causative', *paRi- 'reciprocal', *ma- 'stative', and *ta- 'intransitive'.
Vowels
The vowels of Proto-Huon Gulf, according to Ross, are: