Abstract
A new species of Tettigarctidae Sanmai? zetavena sp. nov. is described and illustrated from the Late Triassic Amisan Formation (Republic of Korea). This new species is the oldest representative of the genus Sanmai Chen et al., 2016, previously only known from the Middle Jurassic of China. This discovery expands the temporal range of the genus Sanmai and increases the morphological diversity of Cicadomorpha during the Triassic. Together with recent discoveries of new fossil insect taxa, the description of this new species advocates for further study of the Amisan Formation palaeoentomofauna.