- Change of Old Turkic *d to /y/, e.g. Kuu-Kizhi aygïr 'stallion', Lower Chulym quyruq 'tail'.
- Preservation of word-final and preconsonantal */G/, e.g. Kumandy-Kizhi tag 'mountain', Lower Chulym ayïɣ 'bear'.
- This may be a wastebasket taxon. Lower Chulym and Kondoma seem to be related (although there is very little documentation of either), as do Kumandy-Kizhi and Kuu-Kizhi. However, it is as of yet unclear whether these two groupings are related. The above characteristics merely place these varieties as basal members of Common Turkic and are not especially unique.
Ceylan, Emine. 1995. “Aşağı Çulım, Kondom-Aşağı Tom Ağızları.” Çağdaş Türk Dili 94: 13-18.
Tekin, Talat. 2005. “A New Classification of the Turkic languages.” In Makaleler III: Çağdaş Türk Dilleri, edited by Nurettin Demir and Emine Yılmaz, 405-420. Ankara: Grafiker.