1. Eurasiatic languages.
i. Indo-European languages.
ii. Uralic languages.
iii. Altaic languages.
2. Afro-Asiatic languages.
3. Kartvelian languages.
4. Dravidian languages.
The two branches of the linguistic tree are part of the “Sinosphere” & “Indosphere” of language types shown in the map below.
Nostratic is the Indosphere geography; and, Dene-Caucasian is the Sinosphere geography.
Languages in the “Sinosphere” (Dene-Caucasian) tend to be analytic, with little morphology, monosyllabic or sesquisyllabic lexical structures, extensive compounding, complex tonal systems, and serial verb constructions.
Languages in the “Indosphere” (Nostratic) tend to be more agglutinative, with polysyllabic structures, extensive case and verb morphology, and detailed marking of interpropositional relationships.