Xerodelphax ivanovi, Legalov, 2024

Legalov, Andrei A., 2024, A new species of the genus Xerodelphax Korotyaev, 1992 (Coleoptera: Curculionidae) from Kazakhstan, Ecologica Montenegrina 72, pp. 141-145 : 142-145

Xerodelphax ivanovi sp. n. ( Figs. 2-3 )

https://zoobank.org/ urn:lsid:zoobank.org:act:40C2B9E4-96C4-4D36-BDC3-CB43A9FF62CE

Type material: Holotype, male, Kazakhstan, Abai Region , Ayagoz District, ~ 1.7 km SSW of Karakum, 46°47′34.0″ N, 79°34′21.5″ E, 2.VI.2016, S. Ivanov.

Description. Male: Body black, covered with dense wide pale and brownish scales and semierect long setae. Apices of tibiae and tarsal claws brownish. Rostrum short, almost straight, with weak middle line, densely punctate, 0.9 times as long as wide at apex, about 0.8 times as long as wide in middle, about 0.7 times as long as wide at base, and 0.4 times as long as pronotum, not separated from forehead by transverse sulcus. Epistome covered with dense scales. Mandibles massive and glabrous, with scar of deciduous process. Antennal scrobes located laterally. Forehead weakly convex, slightly wider than rostrum base width, densely punctate. Eyes large, finely faceted, suboval, convex, protruding from contour of head. Temples quite short, about 0.5 times as long as length of eye. Antennae inserted subapically, long. Scapus long, weakly curved, 7.6 times as long as wide at apex, extending beyond front edge of pronotum. First and second antennomeres long-conical. Second antennomere about 2.7 times as long as wide, about 0.3 times as long as and 0.9 times as narrow as first antennomere. Third antennomere about 1.7 times as long as wide, about 0.4 times as long as and about 0.7 times as narrow as second antennomere. Fourth–eighth antennomeres subconical. Fourth antennomere about 0.9 times as long as wide, 0.6 times as long as and about 1.2 times as wide as third antennomere. Fifth antennomere equal to fourth antennomere. Sixth and seventh antennomeres rounded, equal in width. Sixth antennomere about 0.7 times as long as wide, about 0.8 times as long as and equal in width to fifth antennomere. Seventh antennomere about 0.8 times as long as wide at apex, 1.2 times as long as and about 1.1 times as wide as sixth antennomere. Eighth antennomere about 0.7 times as long as wide, equal in length and about 1.1 times as wide as seventh antennomere. Club compact about 0.4 times as second–eighth antennomeres combined. Ninth antennomere about 0.6 times as long as wide, about 1.2 times as long as and about 1.3 times as wide as eighth antennomere. Ninth antennomere about 0.6 times as long as wide, about 1.3 times as long as and about 1.2 times as wide as ninth antennomere. Eleventh antennomere 0.5 times as long as wide, about 0.7 times as long as and about 0.9 times as narrow as tenth antennomere. Pronotum companiform, 1.3 times as long as wide at apex, about 0.9 times as long as wide in middle, about 1.1 times as long as wide or subequal to wide at base. Sides convex. Greatest width in front of middle. Disk weakly convex, densely punctate. Scutellum large, triangular. Elytra suboval, about 3.3 times as long as wide at base and at apex, 2.4 times as long as wide in middle, 3.6 times as long as pronotum. Humeri smoothed. Greatest width behind middle. Interstriae wide, 6.5-7.5 times as wide as striae, flattened. Striae distinct. Procoxal cavities contiguous and rounded. Front margin of prosternum with vibrissae and lacking postocular lobes. Precoxal portion of prosternum very short. Postcoxal portion 3.5 times as long as precoxal portion and 0.5 times as long as procoxa. Metaventrite about 1.6 times as long as metacoxal length, flattened, punctate. Metanepisterna narrow. Abdomen flattened, densely punctate. First ventrite about 1.5 times as long as length of metacoxal cavity. Second ventrite about 0.9 times as long as first ventrite. Third and fourth ventrites equal in length. Third ventrite about 0.6 times as long as second ventrite. Fifth ventrite about 2.2 times as long as fourth ventrite. Pygidium covered by elytra. Legs long. Femora widened, lacking teeth. Tibiae widened at apex, with apical comb of spines. Pro- and mesotibiae with mucro. Protibiae weakly biconcave on inner edge. Meso- and metatibiae weakly curved. Tarsi long. First-third tarsomeres with pulvilli on lower surface. First tarsomere long-conical, longer than second tarsomere. Second tarsomere conical. Third tarsomere weakly bilobed, shorter than second tarsomere. Fourth tarsomere short. Fifth tarsomere elongate. Claws long and free. Length of body: 7.2 mm. Length of rostrum: 0.7 mm.

Differential diagnosis. The new species is similar to Xerodelphax parthicus from Turkmenistan but differs in the pointed apex of the aedeagus, a broader pronotum anterior to the middle and a narrower body.

Etymology. The species is named after the late Dr. Alexander V. Ivanov (Ekaterinburg, Russia).

Localisation. Eastern Kazakhstan, Abai Region, Ayagoz District.

Acknowledgements

The author thanks Boris A. Korotyaev ( St. Peterburg , Russia) for providing Xerodelphax types to study, and anonymous reviewers for improving the overall quality of the manuscript .

References

Alonso-Zarazaga, M.A., Barrios, H., Borovec, R., Bouchard, P., Caldara, R., Colonnelli, E., Gültekin, L., Hlaváč, P., Korotyaev, B., Lyal, C.H.C., Machado, A., Meregalli, M., Pierotti, H., Ren, L., Sánchez- Ruiz, M., Sforzi, A., Silfverberg, H., Skuhrovec, J., Trýzna, M., Velázquez de Castro, A.J., Yunakov, N.N. (2023) Cooperative catalogue of Palaearctic Coleoptera Curculionoidea. 2nd Edition. Monografías electrónicas, 14, 780 p.

Korotyaev, B.A. (1992) New and little known Palaearctic weevils (Coleoptera: Apionidae, Curculionidae). Entomologicheskoe Obozrenie, 70 (4), 875–902.

Lawrence, J.F., Beutel, R.G., Leschen, R.A.B., Slipinsky, S.A. (2010) Chapter 2. Glossary of Morphological Terms. Handbook of Zoology, Arthropoda: Insecta, Coleoptera, beetles, Vol. 2: Morphology and systematics (Elateroidea, Bostrichiformia, Cucujiformia partim). Leschen, R.A.B, Beutel, R.G., Lawrence J.F. (Eds.). Walter de Gruyter, Berlin and New York, 9–20.

Legalov, A.A. (1998) A review of the weevils of the genus Chlorophanus C. Sahlberg, 1823 (Coleoptera, Curculionidae) in the fauna of Siberia and the Russian Far East. Russian Entomological Journal, 6 (3–4), 53–63.

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https://doi.org/10.15421/2020_105

Legalov, A.A. (2020 b) Revised checklist of weevils (Coleoptera: Curculionoidea excluding Scolytidae and Platypodidae) from Siberia and the Russian Far East. Acta Biologica Sibirica, 6, 437–549.

https://doi.org/10.3897/abs.6.e59314

Legalov, A.A. (2023 a) A new synomyn of Hypomeces pulviger (Herbst, 1795) (Coleoptera, Curculionidae) from China. Euroasian Entomological Journal, 22 (2), 109–110.

https://doi.org/10.15298/euroasentj.22.02.10

Legalov, A.A. (2023 b) First record of Phacephorus umbratus (Faldermann, 1835) (Coleoptera, Curculionidae) from the Omskaya Oblast of Russia with taxonomic remarks on the species. Euroasian Entomological Journal, 22 (4), 227–228.

https://doi.org/10.15298/euroasentj.22.04.07

Legalov, A.A. & Reshetnikov, S.V. (2022) First record of Chlorophanus caudatus Fåhraeus, 1840 (Coleoptera, Curculionidae) from Western Siberia. Ecologica Montenegrina, 56, 53–59.

https://dx.doi.org/10.37828/em.2022.56.8

Figures

Figure 2. Xerodelphax spp., habitus, dorsal view: a – X. ivanovi sp. n., holotype, b – X. parthicus; c – X. karakumicus, holotype. Scale bar = 1.0 mm.

Figure 3. Xerodelphax ivanovi sp. n., male, holotype: a – abdomen; b – aedeagus, dorsal view; c – apex of aedeagus, dorsal view. Scale bar = 1.0 mm.