The new archaeorthopteran family Archaeogeraridae, based on Archaeogerarus schubneli gen. et sp. nov., is described from the Moscovian of Avion. It has several unique wing venation characters allowing to separate it from the other groups of this superorder, viz. a vein RP separating from RA very close to wing base and closely parallel to it; M shortly fused with RP; CuA+CuPa simple and straight; and CuPb branched. This last character is convergently present in a few Palaeozoic Panorthoptera, a feature of great interest for a future phylogenetic analysis of the whole superorder. Avionxixia gui gen. et sp. nov., second Cnemidolestidae from the Moscovian of Avion, is described and illustrated. It shares numerous characters with the Chinese Namurian genus Xixia and the European (Germany and France) Moscovian genus Piesbergopterum, suggesting possible phylogenetic affinities between these three genera. It is mainly separated from these two genera by the costal area much narrower than the subcostal one and the presence of only one posterior branch of the anterior branch of MP+CuA+CuPa. This new taxon confirms the high diversity of the Cnemidolestidae during the late Carboniferous.

Key words: Insecta, Polyneoptera , Cnemidolestodea, Archaeogeraridae fam. nov., forewing venation convergences, Carboniferous, France.

André Nel [anel@mnhn.fr, ORCID: https://orcid.org/0000-0002-4241-7651], Institut de Systématique, Évolution, Biodiversité (ISYEB) Muséum national d’Histoire naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, CP50, 57 rue Cuvier 75005 Paris, France. Patrick Roques [patrick.roques93@wanadoo.fr, ORCID: https://orcid.org/0000-0002-8721-9763], 22 Chemin des Processions, 93360 Neuilly Plaisance, France.