Revision of Mandarella Duvivier from Taiwan, with a new species, new synonymies and identities of highly variable species (Insecta, Chrysomelidae, Galerucinae, Alticini)

Taiwanese species of Mandarella Duvivier are compared on the basis of morphological and molecular evidence. Only three of eleven morphospecies are considered to be valid. Mandarella uenoi (Kimoto, 1969) is transferred from the genus Luperus Geoffroy. Stenoluperus taiwanus Kimoto, 1991 and S. kimotoi Doberl, 2001 are synonymized with M. uenoi. Taiwanese records of Stenoluperus tibialis Chen, 1942, S. nipponensis Laboissiere, 1913, and S. potanini (Weise, 1889) were based on misidentifications and represent M. uenoi. The Taiwanese population previously erroneously identified as S. pallipes Gressitt and Kimoto, 1963 is here described as a new species, M. tsoui sp. n., Stenoluperus esakii Kimoto, 1969, S. matsumurai Takizawa, 1978, and M. taiwanensis Medvedev, 2012 are synonymized with M. flaviventris (Chen, 1942).