Résumé
Koreatriassothemis elongatus gen. et sp. nov. is the first representative of the odonatan superfamilyTriassolestoidea described from the Upper Triassic of the Republic of Korea. Despite close similaritieswith the genera Pseudotriassothemis and Triassoneura, exact affinities within Triassolestoidearemain uncertain, thus discoveries of more complete triassolestoid fossils are required to resolverelationships. The identification of K. elongatus gen. et sp. nov. shows that Odonatoptera andTriassolestoidea diversity was high during the Late Triassic and is currently underestimated. A‘Samarura-like’ odonatopteran nymph is also identified from the same Upper Triassic outcrop, andmay be referable to K. elongatus gen. et sp. nov.