A remarkable new species of the genus Dichodontus Burmeister, 1847 (Coleoptera: Scarabaeidae: Dynastinae) from Thailand and Myanmar, with discussions on some Sundaic species

• A new species of Dichodontus is described from Thailand and Myanmar. • D. punctipennis is newly recorded from Thailand, and D. grandis is newly recorded from Thailand and Myanmar. • Rediscovery of paralectotypes of two species are provided, and type material of some species are illustration for the first time. • Misidentification of a species is identified and discussed. Dichodontus fluctus Geshev, Pathomwattananurak & Jiaranaisakul, new species from Thailand and Myanmar is described and illustrated. Lectotypes and newly identified paralectotypes of Dichodontus punctipennis Arrow, 1937 and Dichodontus grandis Ritsema, 1882 , as well as the holotype and a female paratype of Dichodontus crassus Silvestre, 2001 are illustrated. D. punctipennis is newly recorded from Thailand, and D. grandis is recorded from Thailand and Myanmar for the first time. Additionally, previous record of D. crassus from Thailand is discussed and omitted from the distribution.