An update to the taxonomy and distribution of species of Tetraserica Ahrens, 2004 (Coleoptera: Scarabaeidae) from continental Southeast Asia is given. We present new records of 57 taxa and describe 14 new species: Tetraserica elargata Ahrens, Pacholátko & Pham, sp. nov., T. guidosabatinellii Ahrens, Pacholátko & Pham, sp. nov., T. haucki Ahrens, Pacholátko & Pham, sp. nov., T. konplong Ahrens, Pacholátko & Pham, sp. nov., T. lucieae Ahrens, Pacholátko & Pham, sp. nov., T. misofi Ahrens, Pacholátko & Pham, sp. nov., T. paraspinicrus Ahrens, Pacholátko & Pham, sp. nov., T. pseudospinicrus Ahrens, Pacholátko & Pham, sp. nov., T. quangnam Ahrens, Pacholátko & Pham, sp. nov., T. quangtri Ahrens, Pacholátko & Pham, sp. nov., T. schnelli Ahrens, Pacholátko & Pham, sp. nov., T. similis Ahrens, Pacholátko & Pham, sp. nov., T. sonla Ahrens, Pacholátko & Pham, sp. nov., T. strbai Ahrens, Pacholátko & Pham, sp. nov. The name of Tetraserica semidamaidiensis Fabrizi, Dalstein & Ahrens, 2019 is emended in respect to its incorrect original spelling: Tetraserica semidamadiensis Fabrizi, Dalstein & Ahrens, 2019. The male genitalia of the new species are illustrated and diagnostic characters to related species are given. The key to species of Asian mainland is updated.
Phú et al. (Tue,) studied this question.