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The family Mesopanorpodidae is revised. Most taxa referred to this family are not related to the type genus Mesopanorpodes Tillyard, 1918. The type species of the latter, Mesopanorpodes wianamattensis,is closely related to Mesopsyche Tillyard, 1917. Therefore Mesopanorpodes is transferred to Mesopsychidae Tillyard, 1917 (= Mesopanorpodidae Tillyard, 1918, syn. n.).The earliest Mesopsychidae are described from the Upper Permian of European Russia (Severodvinian; Isady locality, Vologda Province): Permopsyche issadensisgen. etsp. n. (type species) and Permopsyche rasnitsynisp. n. Two species described under Mesopanorpodes from the Upper Permian of Australia are also included into Permopsyche: Permopsyche belmontensis (Riek, 1953), comb. n., Permopsyche robustus (Riek, 1953) comb. n. The first pre-Triassic Mesopsyche, Mesopsyche incompletasp. n. is described from the uppermost Permian (the town of Vyazniki, Vladimir Province). Bittacopanorpa javorskii Zalessky, 1935 from the uppermost Permian or basal Triassic of Kuznetsk Basin is identified as a hindwing of Mesopsyche: Mesopsyche javorskii (Zalessky, 1935) comb. n. The origin, evolutionary history, and stratigraphic occurrence of Mesopsychidae are discussed.

The earliest Mesopsychidae and revision of the family Mesopanorpodidae (Mecoptera)