Kishenehna prima, Archibald & Cannings & Greenwalt, 2022

Archibald, S. Bruce, Cannings, Robert A. & Greenwalt, Dale E., 2022, Kishenehna prima, a new genus and species of darner dragonfly (Odonata, Aeshnidae, Gomphaeschninae) from the early middle Eocene Kishenehn Formation of Montana, USA, Zootaxa 5099 (4), pp. 496-500 : 498-499

Kishenehna prima new species Archibald & Cannings

Diagnosis. As for genus.

Material. USNM 621304, a finely preserved female hind wing, complete except broken across its basal region and other small portions missing, collected at the Park site of the Coal Creek Member of the Kishenehn Formation by DEG July, 2015. Housed in the collections of the Paleobiology Department of the National Museum of Natural History in Washington, DC.

Description. Female hind wing with character states of diagnosis and: recognisable humeral, axillary plates at base (cf. Grimaldi & Engel 2005, Fig. 4.6); 36 mm long, maximum width 11 mm; membrane hyaline throughout; pterostigma length four times width, subtends 1.5 cells; 11 antenodal crossveins; no crossveins stouter, identifiable as Ax1 or Ax2 as preserved; 9 postnodal, 9 postsubnodal crossveins, not aligned; pterostigmal brace vein present; oblique vein O present, first crossvein in RP2–IRP2 space distal to origin of RP2; RP2, IRP2 subparallel distal to bend of RP2 to margin; triangle with distal side (MAb) kinked; radial, medial planates rather straight, curving toward posterior margin only in their last cell; CuA–A space apparently maximum five cells wide; only one vein (CuP) crosses the cubito-anal space, i.e., basal to subtriangle.

Etymology. The specific epithet prima is from the Latin primus, “the first”, as this is the first dragonfly ( Anisoptera ) described from the Kishenehn Formation.

Range and age. The early-middle Lutetian Coal Creek Member of the Kishenehn Formation, northwest Montana, United States of America.