The Angkuic languages are affected by a diagnostic "Germanic-type" stop onset shift that synchronically devoiced all voiced stop onsets and made voiceless stop onsets become aspirated.
All Angkuic lects are tonal, but their tonogenesis are not related to VOT, but rather involved the transphonologization of vowel length contrast.
Proto-Palaungic final nasals became stop codas (*-ŋ > -k > -ʕ, *-m > -p, *-n > -t) in Northern Angkuic languages.
Hsiu (2015) suggests that the Angkuic languages originated in the Mekong River valley in the Sipsongpanna area, and subsequently dispersed upstream into western and central Yunnan.
Sidwell, Paul. 2009. Classifying the Austroasiatic languages: history and state of the art. LINCOM studies in Asian linguistics, 76. Munich: Lincom Europa.
Sidwell, Paul (2015). The Palaungic Languages: Classification, Reconstruction and Comparative Lexicon. München: Lincom Europa.Archived 2019-10-23 at the Wayback Machine. München: Lincom Europa.
Bibliography
Sources with lexical data of Angkuic languages
Chen Guoqing [陈国庆]. 2005. A study of Kemie [克蔑语研究]. Beijing: Ethnic Publishing House [民族出版社].
Luce, Gordon. n.d. Comparative lexicon For Austroasiatic list: Wa - Danang Palaung - En - Amok - Möng-Lwe-Hkamuk - Angku - Wa Kut - Son. m.s.
Luce, Gordon. n.d. Comparative lexicon: P'uman - Wa - La - Vü - Tailoi - Angku - Hkamuk - K'amu - Khmous - Lamet - P'eng (T'eng) - Nañang (Wa-Khmuk-Lemet Group (i)). m.s.
Simao Prefecture Ethnic Minority Affairs Bureau [思茂行署民族事务委员会编]. 1991. A study of the Bulang people [布朗族研究]. Kunming: Yunnan People's Press [云南人民出版社]. ISBN7-222-00803-9
Svantesson, Jan-Olof. 1988. "U." In Linguistics of the Tibeto-Burman Area, 11, no. 1: 64-133.
Svantesson, Jan-Olof. 1991. "Hu - a Language with Unorthodox Tonogenesis." In Austroasiatic Languages, Essays in honour of H. L. Shorto, edited by Jeremy H.C.S. Davidson. 67-80. School of Oriental and African Studies, University of London.
Wang Xingzhong [王兴中] & Zhao Weihua [赵卫华]. 2013. Geography and multilingualism in Lincang [临沧地理与双语使用]. Kunming: Yunnan People's Press [云南人民出版社]. ISBN978-7-222-08581-7
Yan Qixiang [颜其香] & Zhou Zhizhi [周植志]. 2012. Mon-Khmer languages of China and the Austroasiatic family [中国孟高棉语族语言与南亚语系]. Beijing: Social Sciences Academy Press Social Sciences Literature Press.
Gazetteers and other Chinese government sources with lexical data
Nanjian County Gazetteer Commission [南涧县志编纂委员会编] (ed). 1993. Nanjian County Gazetteer [南涧彝族自治县志]. Chengdu: Sichuan Reference Press [四川辞书出版社].
Na Ruzhen [納汝珍], et al. (eds). 1994. Zhenkang County Ethnic Gazetteer [镇康县民族志]. Kunming: Yunnan People's Press [云南民族出版社].
Simao Prefecture Ethnic Minority Affairs Bureau [思茅行暑民族事务委员会] (ed). 1990. A study of the Bulang people [布朗族研究]. m.s.
Simao Prefecture Ethnic Minority Affairs Bureau [思茅行暑民族事务委员会] (ed). 1991. A study of the Bulang people [布朗族研究]. Kunming: Yunnan People's Press [云南人民出版社]. ISBN7222008039
Xiao Dehua [萧德虎], et al. (eds). 1992. Zhenkang County Gazetteer [镇康县志]. 1992. Chengdu: Sichuan People's Press [四川民族出版社].