Palaeodysagrion Zheng et al., 2016

Bechly, Günter & Velten, Jürgen, 2023, A Revised Diagnosis of Palaeodysagrion cretacicus Zheng et al., 2016 (Insecta: Odonata) from mid-Cretaceous Burmese Amber, with erection of a new genus of fossil damselflies, Zootaxa 5263 (4), pp. 547-556 : 549

Palaeodysagrion Zheng et al., 2016

Type species. Palaeodysagrion cretacicus Zheng et al., 2016

Revised diagnosis. Wing length about 25 mm; dense wing venation with numerous cells; 15–17 postnodal crossveins that are well-aligned with the postsubnodals; pterostigma elongate and covering 3.5 cells; both side of pterostigma parallel and of normal obliquity; pterostigmal brace present; IR1 very long with 2 rows of cells between it and RP1 and RP2 respectively; nodus (n) in a basal position at about 26–27 % of wing length; nodus and subnodus oblique; base of IR2 aligned with subnodus (sn); no lestine oblique vein ‘O’ between RP2 and IR2; midfork one cell (elongate bridge space) basal of nodus, closer to nodus than to arculus; 6–7 crossveins between RP1+2 and IR2; cells in postdiscoidal space numerous, short and high; cells in space between MP and CuA numerous, short, high (transverse), and only weakly pentagonal; CuA very long; cubito-anal space with a single row of cells (slightly widened in hind wing); cubital crossing (CuP) oblique and situated close to arculus; ax2 aligned with arculus in forewing but slightly distal of arculus in hind wing; discoidal cell elongate (even more so in hind wing) with distal side somewhat longer than basal side (esp. in fore wing); no accessory antenodal crossveins.