Checklist of mayflies (Ephemeroptera) of Thailand

An updated checklist of Thai Ephemeroptera is presented, comprising 150 valid species belonging to 74 genera in 19 families. Knowledge of the systematics of Thailand’s mayfly fauna has steadily increased over the past decade. The checklist provided herein offers comprehensive documentation of the diversity of mayflies in Thailand. The families Baetidae (38 species) and Heptageniidae (25 species) are the most diverse and common groups of Thai mayflies. Four genera (Cymbalcloeon Suttinun, Gattolliat, and Boonsoong, 2020, Mekongellina Malzacher, 2019, Sangpradubina Boonsoong and Sartori, 2016 and Thainis Malzacher, 2020) are endemics of Thailand. Since several genera and species are only known as larvae, their imagines need to be found and described. Number of the known species is still lower than the estimated species diversity, and several new species are to be discovered. The DNA barcoding library of Thai mayflies (with 62% known species) has been expanding and could be used as a driving tool for the future research on biodiversity and biomonitoring. The checklist of mayfly fauna will contribute fundamental information to taxonomy, systematics and biomonitoring programmes in Thailand.