Abstract
Beetles belonging to the extinct tribe Notocupedini (Archostemata: Ommatidae) are widespread in Mesozoic deposits. Two new Early Jurassic species in the first reported Mesozoic insect assemblage from the Qinghai-Xizang (Tibetan) Plateau are proposed in the genus/collective group Zygadenia. Zygadenia dachaidanensis n. sp. can be distinguished from other congeners based on a combination of small size, oval head, large eyes, absence of longitudinal suture on metasternum, slightly narrowed elytron below humerus, maculated round window cells, and sub-rectangular scutellum; Zygadenia haixiensis n. sp. can be distinguished from other congeners based on a combination of elongated head, uniquely contracted ventrite 5, metasternum with longitudinal suture and elytron without prominent longitudinal veins. The two species represent the first record of Archostemata from the Qinghai-Xizang Plateau, extending the palaeogeographical distribution of Archostemata, and are important an aid to the reconstruction of the Early Jurassic swamp ecosystem in the Qinghai-Xizang Plateau.
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