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ID: <
ftzenodo:oai:zenodo.org:6029939>
DOI: <
10.5281/zenodo.602993910.11646/zootaxa.4272.2.710.5281/zenodo.58389710.5281/zenodo.58389810.5281/zenodo.58389910.5281/zenodo.58390110.5281/zenodo.6029938>
Abstract
Elektrogomphaeschna annekeae sp. nov. (Figs. 5–8) Material. Holotype MNHN.F. A58663, stored in the collection of the Muséum National d’Histoire Naturelle in Paris, France. Etymology. Named after the wife of first author, Anneke. Age and outcrop. Eocene (most probably Upper Eocene, Bartonian or Priabonian), Baltic amber. Diagnosis. Distinguished from the type species by the distinctly larger size (forewing length about 43 mm instead of only 27–31 mm), correlated with larger number of postnodal crossveins (15 instead of 12); Ax 2 in more distal position at level of middle of triangle (instead of level of basal angle of triangle or even slightly basal of triangle); origin of Mspl separated by three cells (instead of four cells) from distal angle of triangle. Description. Two forewings with bases missing, fossilized with an ant, a fly and a curculionid beetle as syninclusions. Forewing hyaline, preserved part 36.0 mm long (estimated total length about 43 mm); 7.3 mm wide; from arculus to nodus about 13.0 mm; from nodus to pterostigma 18.5 mm. Pterostigma 2.5 mm long and 0.8 mm wide, covering three cells, and strongly braced by a very oblique (but straight) crossvein aligned with its basal side. Fifteen postnodal crossveins between nodus and pterostigma, not aligned with thirteen corresponding postsubnodal crossveins between RA and RP1. Vein Ax 2 in basal position on level the ventral side of triangle, stronger than six secondary antenodal crossveins between costal margin and ScP that are not aligned with those of second row between ScP and RA. ScP fusing with costal margin at nodus, of normal anisopteran-type. Six antesubnodal crossveins visible in median part of area between RA and RP basal of subnodus with an incomplete distal gap (with two crossveins) immediately basal of subnodus. Discoidal triangle probably two-celled, very elongated with a slightly bent distal side MAb; length of anterior side probably 4.3 mm; of basal side probably 2.0 mm; of distal side MAb 4.1 mm. Hypertriangle triangular, free of ...