Wing venation homologies of the Protomyrmeleontidae, a widespread group of damselfly-like stem-Odonata during the Triassic, are debated. The two main interpretations essentially disagree on the identification of RP branches. Indeed, Protomyrmeleontidae display a very complex wing venation necessarily involving, in a way or another, fusions of the concave RP branches with the convex intercalary veins. As a consequence, vein elevations in the radial area are challenging to interpret. Here, we present a new Triassic specimen from the Molteno Formation (Karoo Basin, South Africa), Moltenagrion koningskroonensis gen. et sp. nov. It displays a unique venation pattern supporting a new, alternative interpretation involving a pair of supplementary intercalaries. The systematic implications of this wing venation interpretation are then discussed. The new species is assigned to the new family Moltenagrionidae fam. nov., itself considered sister-group of the family Protomyrmeleontidae, as previously delimited, both composing the super-family Protomyrmeleontoidea. Diagnoses of these taxa are revised according to our new interpretation.