Abstract
Two new species of the genus Trixagus Kugelann, 1794 are described. Trixagus incognitus sp. n. is described from southeastern European Russia, Kazakhstan, and Uzbekistan, and T. ussuriensis sp. n., from the Russian Far East and “Siberia.”
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Notes
The modified male mesotarsi of throscid beetles were described in detail only in Aulonthroscus laticollis (Rybiński, 1897) (Burakowski, 2000; Nomura and Hirano, 2014). However, the modified (although usually to a lesser degree) mesotarsi in males are much more widely spread among throscids, and were discovered in all the Aulonothroscus Horn and Trixagus Kugelann species examined. The hypertrophied external claw and modifications on outer side of tarsomere 5 (enlarged setae or outgrowths), sometimes of that of previous tarsomeres, which may act in apposition to the claw, have an apparently prehensile function, and probably play a role in a still poorly known sexual behavior of throscid beetles. At least in some cases, the modifications of male mesotarsomeres are species-specific, but intraspecific variability of these structures needs further study.
REFERENCES
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ACKNOWLEDGMENTS
I am sincerely grateful to A.A. Gusakov and V.Yu. Savitsky (ZMUM), A.S. Lelej and the late G.Sh. Lafer (IBSS), the late O. Merkl and T. Nemeth (HNHM), A.M. Shapovalov (St. Petersburg, Russia), K.P. Tomkovich (Moscow, Russia), and I.A. Zabaluev (A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences, Moscow, Russia) for providing specimens and valuable information for this study.
Funding
The study was supported by the Russian Science Foundation, research projects no. 21-74-20001 (study of material and preparation of photographs) and no. 21-74-10024 (preparation of the manuscript).
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Kovalev, A.V. Two New Species of the Genus Trixagus Kugelann, 1794 (Coleoptera, Throscidae) from the Palaearctic Region. Entmol. Rev. 102, 891–901 (2022). https://doi.org/10.1134/S0013873822060100
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DOI: https://doi.org/10.1134/S0013873822060100