Paracoryphagrionidae fam. nov., a pseudostigmatoid damselfly from mid-Cretaceous Burmese amber showing regular series of triangular cells (Odonata: Zygoptera: Coenagrionida)

Paracoryphagrionidae Zheng, Nel and Wang fam. nov., a new damselfly family based on the genus and species Paracoryphagrion deltoides Zheng, Nel and Wang gen. et sp. nov., is described from Burmese amber. Paracoryphagrionidae is attributed to the clade Pseudostigmatoidea, due to the presence of an extremely long, less zigzagged vein CuA covering numerous cells, reaching the pterostigmal level, and being parallel with the hindwing margin; plus numerous trigonal cells, all shared with Coryphagrion grandis Morton, 1924 of this clade. Paracoryphagrionidae differ from other pseudostigmatoid families in the absence of the kink of RP1 at the pterostigmal brace, a very long sclerotized pterostigma, only one row of cells in the poststigmal area between the costal margin and RA, and no sigmoidally curved RA and RP1 at the wing apex. Paracoryphagrion deltoides is unique within Zygoptera due to the presence of a very elongate pterostigma and many triangular cells in the postsubnodal area.