Integrative taxonomy of the leaf-beetle genus Chevrolat, 1836 in Taiwan (Coleoptera, Chrysomelidae, Chrysomelinae, Gonioctenini) reveals new synonymies and one new species.

Taiwanese species of are revised based on morphological, molecular, and ecological information. (Chen, 1934), (Jacoby, 1888), (Chûjô, 1958), and Kimoto, 1996 are redescribed. The study confirms that Phytodectatredecimmaculatusvar.taiwanensis Achard, 1924 should be considered a junior synonym of (Jacoby, 1888), along with two new junior synonyms, Cho et al. 2016 () and Cho et al. 2016 (). Phytodecta (Asiphytodecta) issikii Chûjô, 1958 () is treated as a junior synonym of Baly, 1862, which is removed from synonym with (Motschulsky, 1861) () and redescribed. Baly, 1862 (), Fairmaire, 1888 (), and Gruev, 1989 () are proposed as junior synonyms of Baly, 1862. A new species, , is described and differentiated ecologically from . Baly, 1862 is newly recorded from Matsu Islands and redescribed. Host plants and biological information are provided for all Taiwanese species. Lectotypes are designated for Baly, 1862, Baly, 1862, and Baly, 1862.