First argiolestid damselfly (Odonata: Zygoptera) from the late Palaeocene of Northwest Argentina Author PETRULEVIČIUS, JULIÁN F. text Palaeoentomology 2020 2020-11-26 3 6 541 545 http://dx.doi.org/10.11646/palaeoentomology.3.6.1 journal article 4092 10.11646/palaeoentomology.3.6.1 937601c5-65de-4679-8e6a-5d9c034ee253 2624-2834 5507655 4DD6E9D8-FC98-4736-B42C-CB94AE48E644 Genus Librelula gen. nov. Type species. Librelula maradoniana sp. nov. Etymology. Wordplay from Castilian words libélula , meaning Odonata , and libre , meaning free; Lula. Diagnosis. (1) pterostigma relatively shortened; (2) tendency to alignment of crossveins; (3) bases of veins RP3/4 and IR2 between levels of nodus and subnodus; (4) branches of RP diverging distally (supplementary sectors); (5) cubital area with two rows of cells; (6) supplementary sectors between medial veins; (7) pterostigma covering three and a half cells; (8) IR2 originating one and a half cells basal to subnodus; (9) distal side of discoidal cell less than twice basal side; (10) CuP+AA emerging from wing margin basal to Ax2; (11) RP3/4 reaching level of pterostigma. Characters 1–3 present in Coenagrionomorpha Bechly (2007) . Character 4 present in Argiolestinae sensu Bechly (2007) . Character 5 present in some Argiolestinae sensu Kalkman & Theischinger (2013) . The combination of characters 6 to 11 is unique.