pachychilus, Protomyzon Chen [Y.-Y.] 1980:106 (English p. 119), Fig. 3 [Acta Hydrobiologica Sinica v. 7 (no. 1); ref. 6901] Mountain stream of West River, Guangxi Province, China. Syntypes: IHB Sinica (7). The specific name is treated as a noun. •Valid as Protomyzon pachychilus Chen 1980 -- (Zheng et al. 1989:249 [ref. 21202], Zhu 1995:132 [ref. 25213], Yue & Chen 1998:208 [ref. 26415], Chen & Tang in Yue 2000:477 [ref. 25272], Tang & Chen 2000:6 [ref. 25445], Neely et al. 2007:99 [ref. 29196] in "Protomyzon", Zhang et al. 2016:161 [ref. 34477]). •Incertae sedis species in "Erromyzon" -- (Kottelat 2012:60 [ref. 32367]). •Valid as Yaoshania pachychilus (Chen 1980) -- (Yang et al. 2012:175 [ref. 32329]). Current status: Valid as Yaoshania pachychilus (Chen 1980). Gastromyzontidae. Distribution: Brooks flowing into Xijiang River, Guangxi Province, China. Habitat: freshwater.