A new species Electrocoenagrion rarissimum sp. nov. of Burmacoenagrionidae is described from mid-Cretaceous Burmese amber. It is assigned to this family by having its typical characteristics: 12–19 postnodal crossveins present; Pt 3–5 short cells long; pterostigmal part of RA and stigmal crossveins thickened to form U-shaped structure; RP1 with weak angle below Pt-brace. Electrocoenagrion rarissimum sp. nov. differs from the other two species of this genus by RP2 originating seven cells distad of Sn, 19–20 postnodal crossveins present basad of Pt in forewing, midfork distinctly distad of N and Arc distad of Ax2. A revised diagnosis of Electrocoenagrion is provided, with a detail description of head and wing base structure.

A new genus and species of true dragonfly Hongtaous caii gen. et sp. nov. is described from the Middle Jurassic of Inner Mongolia, China. It is assigned to the family Aktasiidae based on the following: large and broad wings; narrow postnodal area with many cells distal of elongated pterostigma; very long and straight IR1; and widened area between RP1 and RP2, which is the oldest member of this family to date. Hongtaous caii sp. nov. differs from other genera by the configuration of wing venation such as: two rows of cells between RA and RP1 at level of Pt, and extending to the end of the wing; an elongated IR1, not distally vanishing; discoidal triangle and subdiscoidal triangle divided into multiple cells by transverse veins; presence of Rspl. In addition, its special cerci are simply discussed.

A new genus and new species of the euthemistid, Kidaneuthemis ningchengensis gen. et sp. nov., is described from the Middle Jurassic of Inner Mongolia, China. It can be assigned to the Euthemistidae by the several long intercalary veins between RP1 and IR1, IR1 and RP2, as well as between RP2 and IR2 and between IR2 and RP3/4. Kidaneuthemis ningchengensis gen. et sp. nov. distinguishes from the other two genera of this family by the presence of not less than eight intercalary veins between MP and wing margin; about three rows of cells in the distal part between MA and MP; the base of IR2 is two cells distal to that of RP3/4. In addition, a revision of the family Euthemistidae has been proposed.

A new hemeroscopid species, Hemeroscopus jinjuensis Wei, Nam & Liu sp. nov., is described from the Lower Cretaceous Jinju Formation in the Jinju area of Gyeongsangnam Province, Republic of Korea based on the venational characteristics. The vannal region of wing is key for the taxonomy of Hemeroscopidae Pritykina, 1977, and compared to Prohemeroscopidae Bechly et al., 2002 the morphological variation of vannal region in Hemeroscopidae is outlined as follows: the anal loop enlarges and the MP–CuAa area expands, whereas the region between the basal and distal portions of CuAa, as well as the area between the anal loop and the anal triangle, becomes progressively reduced.