Kluge N.Ju. 2012. Contribution to the knowledge of Choroterpes (Ephemeroptera: Leptophlebiidae) // Russian Entomol. J. Vol.21. No.3: 273–306 [in English].

Department of Entomology, St. Petersburg State University, Universitetskaya nab., 7/9, St. Petersburg 199034, Russia. E-mail: kluge@FK13889.spb.edu. Website: http://www.insecta.bio.pu.ru

KEY WORDS: systematics, Ephemeroptera, Leptophlebiidae, Atalophlebomaxillata, Choroterpes, Neochoroterpes, Euthraulus, Monophyllus, Dilatognathus, Choroterpides, new species.

ABSTRACT. The taxon Atalophlebomaxillata is characterized by presence of an apical flange on maxilla; this flange is lost only in those representatives, whose maxillae are highly specialized. Within Atalophlebomaxillata-Atalophlebolinguata, a new tribe Choroterpini tribus n. (or Choroterpes/fg1) is established, to comprise Thraulus and Choroterpes s.l. (or Choroterpes/fg2). The taxon Choroterpes/fg2 is divided into Choroterpes/fg3 (characterized by lanceolate median filaments on tergalii) and Euthraulus/g1 (characterized by arched penial arms). Choroterpes/fg3 includes a widely distributed plesiomorphon Choroterpes/fg4 and a Nearctic taxon Neochoroterpes. Based on imagoes reared from larvae, new species and subspecies of Choroterpes/fg4 are described — Ch. (Ch.) picteti subcostalis ssp.n. from Caucasus (Russia), Ch. (Ch.) ludmilae sp.n. from Oman and Ch. (Ch.) mercatorius sp.n. from Sulawesi Island (Indonesia). The taxon Euthraulus/g1 has exclusively Old-World distribution; it includes widely distributed plesiomorphon Euthraulus/g2 and two small Oriental taxa — Monophyllus subgen.n. and Dilatognathus subgen.n. Based on imagoes reared from larvae, a new species of Euthraulus/g2 is described — Ch. (Euthraulus) caucasicus sp.n., and additional descriptions to Ch. (E.) altioculus, Ch. (E.) sumbarensis and Ch. (E.) signatus are given. The taxon Monophyllus includes a single species Ch. (Monophyllus) monophyllus sp.n., described as mature larvae from Hainan Island (China). Larvae of the taxon Dilatognathus are known under the generic name Choroterpides, whose type species (exiguus Eaton, 1884 [Thraulus]) is known only as imago and probably belongs to Euthraulus/g2. The type species of Dilatognathus is Choroterpes (Dilatognathus) cataractae sp.n., described as imagoes reared from larvae in Lombok Island (Indonesia). Similar modifications in mouthparts structure independently evolved in non-related taxa Dilatognathus, Notophlebia, Hermanellognatha, Hagenulus/fg3 and Ulmeritus/g2.

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