title: Mayflies of the Caucasus Mountains. II. Description of the first representative of the subgenus Helvetoraeticus Bauernfeind & Soldán, 2012 (Heptageniidae: Ecdyonurus).
abstract: The first representative of the subgenus Helvetoraeticus Bauernfeind & Soldán, 2012, from the Caucasus Mountains, Ecdyonurus (Helvetoraeticus) adjaricus sp. nov., is described on the basis of larvae, female imago (reared from larva) and male imago from the Autonomous Republic of Adjara, Georgia. The male imago of the new species can be separated from other representatives of Helvetoraeticus by its conspicuous yellowish wings coloration (especially of hind wings) and the shape of the penis lobes. The larva has a distinctive broad and apically pointed lateral projection on the pronotum, pointed bristles on the ventral side of the posterior border of the femora and markedly long, sharp posterolateral expansions of abdominal sterna. This last character is unique within Helvetoraeticus. The new species is most closely related to E. krueperi (Stein, 1863).
authors.affiliation: Department of Entomology, Biological Faculty, Saint-Petersburg State University, University Embankment 7, 199034 Saint-Petersburg, Russian Federation; Email: kluge@FK13889.spb.edu.
authors.forename: Nikita J
authors.initials: NJ
authors.lastname: Kluge
authors.affiliation: State Museum of Natural History, National Academy of Sciences of Ukraine, Teatralna 18, 79008 Lviv, Ukraine and Biology Centre of the Academy of Sciences of the Czech Republic, Institute of Entomology, Branišovská 31, CZ-37005 České Budějovice, Czech Republic; Email: godunko@museum.lviv.net.
authors.forename: Roman J
authors.initials: RJ
authors.lastname: Godunko
authors.affiliation: United States National Tick Collection, The James H. Oliver, Jr. Institute of Arthropodology and Parasitology, Georgia Southern University, P.O. Box 8056, Statesboro, Georgia 30460, USA; Email: dapanaskevich@georgiasouthern.edu.
authors.forename: Dmitry A
authors.initials: DA
authors.lastname: Apanaskevich
mesh_terms: D000818:Animals; D005260:Female; D005846:Georgia (Republic); D007313:Insecta / Q000033:anatomy & histology* / Q000145:classification* / Q000254:growth & development; D007814:Larva / Q000033:anatomy & histology / Q000145:classification / Q000254:growth & development; D008297:Male