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North Munda
Korku
Kherwarian
South Munda
Kharia–Juang
Koraput Munda
Mon–Khmer
Eastern Mon–Khmer
Khmer (Cambodian)
Pearic
Bahnaric
Katuic
Vietic (Vietnamese, Muong)
Northern Mon–Khmer
Khasi (Meghalaya, India)
Palaungic
Khmuic
Southern Mon–Khmer
Mon
Aslian (Malaya)
Nicobarese (Nicobar Islands)
Peiros (2004)
Peiros is a lexicostatistic classification, based on percentages of shared vocabulary. This means that languages can appear to be more distantly related than they actually are due to language contact. Indeed, when Sidwell (2009) replicated Peiros's study with languages known well enough to account for loans, he did not find the internal (branching) structure below.
Nicobarese
Munda–Khmer
Munda
Mon–Khmer
Khasi
Nuclear Mon–Khmer
Mangic (Mang + Palyu) (perhaps in Northern MK)
Vietic (perhaps in Northern MK)
Northern Mon–Khmer
Palaungic
Khmuic
Central Mon–Khmer
Khmer dialects
Pearic
Asli-Bahnaric
Aslian
Mon–Bahnaric
Monic
Katu–Bahnaric
Katuic
Bahnaric
Diffloth (2005)
Diffloth compares reconstructions of various clades, and attempts to classify them based on shared innovations, though like other classifications the evidence has not been published. As a schematic, we have:
Or in more detail,
Munda languages (India)
Koraput: 7 languages
Core Munda languages
Kharian–Juang: 2 languages
North Munda languages
Korku
Kherwarian: 12 languages
Khasi–Khmuic languages (Northern Mon–Khmer)
Khasian: 3 languages of north eastern India and adjacent region of Bangladesh
Palaungo-Khmuic languages
Khmuic: 13 languages of Laos and Thailand
Palaungo-Pakanic languages
Pakanic or Palyu: 4 or 5 languages of southern China and Vietnam
Palaungic: 21 languages of Burma, southern China, and Thailand
Nuclear Mon–Khmer languages
Khmero-Vietic languages (Eastern Mon–Khmer)
Vieto-Katuic languages ?
Vietic: 10 languages of Vietnam and Laos, including Muong and Vietnamese, which has the most speakers of any Austroasiatic language.
Katuic: 19 languages of Laos, Vietnam, and Thailand.
Khmero-Bahnaric languages
Bahnaric: 40 languages of Vietnam, Laos, and Cambodia.
Khmeric languages
The Khmer dialects of Cambodia, Thailand, and Vietnam.
Pearic: 6 languages of Cambodia.
Nico-Monic languages (Southern Mon–Khmer)
Nicobarese: 6 languages of the Nicobar Islands, a territory of India.
Asli-Monic languages
Aslian: 19 languages of peninsular Malaysia and Thailand.
Monic: 2 languages, the Mon language of Burma and the Nyahkur language of Thailand.
Sidwell (2009–2015)
Paul Sidwell (2009), in a lexicostatistical comparison of 36 languages which are well known enough to exclude loanwords, finds little evidence for internal branching, though he did find an area of increased contact between the Bahnaric and Katuic languages, such that languages of all branches apart from the geographically distant Munda and Nicobarese show greater similarity to Bahnaric and Katuic the closer they are to those branches, without any noticeable innovations common to Bahnaric and Katuic.
He therefore takes the conservative view that the thirteen branches of Austroasiatic should be treated as equidistant on current evidence. Sidwell & Blench (2011) discuss this proposal in more detail, and note that there is good evidence for a Khasi–Palaungic node, which could also possibly be closely related to Khmuic.
If this would the case, Sidwell & Blench suggest that Khasic may have been an early offshoot of Palaungic that had spread westward. Sidwell & Blench (2011) suggest Shompen as an additional branch, and believe that a Vieto-Katuic connection is worth investigating. In general, however, the family is thought to have diversified too quickly for a deeply nested structure to have developed, since Proto-Austroasiatic speakers are believed by Sidwell to have radiated out from the central Mekong river valley relatively quickly.
Subsequently, Sidwell (2015a: 179) proposed that Nicobarese subgroups with Aslian, just as how Khasian and Palaungic subgroup with each other.
A subsequent computational phylogenetic analysis (Sidwell 2015b) suggests that Austroasiatic branches may have a loosely nested structure rather than a completely rake-like structure, with an east–west division (consisting of Munda, Khasic, Palaungic, and Khmuic forming a western group as opposed to all of the other branches) occurring possibly as early as 7,000 years before present. However, he still considers the subbranching dubious.