iE Xizang, WC and NC China from N Sichuan to E Qinghai and Gansu
1 A family name was proposed for this single genus by Domaniewski (1918) [Domaniewski, 1918 #15675] but this has been little accepted; so far molecular support for this comes from the limited mtDNA evidence of Groth (2000) [Groth, 2000 #1836] and the work of Yang Shu-Juan et al. (2006) [Yang Shu-Juan, 2006 #10122].