Tychius tachengicus Jiang & Caldara, 2020

Jiang, Chunyan, Caldara, Roberto & Zhang, Runzhi, 2020, The genus Tychius Germar (Coleoptera: Curculionidae: Curculioninae) in China, with description of three new species, Zootaxa 4856 (1), pp. 1-62 : 29

publication ID	https://doi.org/ 10.11646/zootaxa.4856.1.1
publication LSID	lsid:zoobank.org:pub:0C2E90FC-25FD-455D-86A7-0BA8210C0A30
DOI	https://doi.org/10.5281/zenodo.4501856
persistent identifier	https://treatment.plazi.org/id/632E87E8-FFA3-FFED-E6D5-FF51FD7F8622
treatment provided by	Plazi
scientific name	Tychius tachengicus Jiang & Caldara
status	sp. nov.

Treatment

27. Tychius tachengicus Jiang & Caldara n. sp. Zoobank.org/ urn:lsid:zoobank.org:act:134BACEC-DA5F-48D8-ACFF-C0DFB2F0CBC8

( Figures 85–88 View FIGURES 73–90 , 207–210 View FIGURES 197–220 , 289–290 View FIGURES 275–306 , 330 View FIGURES 307–339 , 343, 355 View FIGURES 340–363 , 386 View FIGURES 380–387 , 421 View FIGURES 397–431 , 450 View FIGURES 432–457 , 477 View FIGURES 458–484 )

Material examined. Holotype, male, CHINA: Xinjiang: Tacheng, Alhagi sparsifolia , 24-VI-1984, leg Jiahu Fu ( IOZCAS) . Paratypes, same data as holotype (15 IOZCAS).

Diagnostic description. Length 1.70–2.00 mm ( Fig. 85–88 View FIGURES 73–90 ). Vestiture on dorsum grayish to brown, either unicolorous or bicoloured. Rostrum ( Fig. 207–210 View FIGURES 197–220 ) short, moderately stout (Rl/Rw 4.55–4.58 in male, 4.73–5.27 in female; Rl/Pl 1.00– 1.04 in male, 1.06 in female), distinctly curved in basal half. Pronotum subparallel-sided from base to distal third, slightly wider than long (Pw/Pl 1.16–1.19). Elytra (El/Ew 1.44–1.51; Ew/Pw 1.37–1.43) with rectilinear sides in basal half. Femora ( Fig. 289–290 View FIGURES 275–306 ) unarmed, tibiae ( Fig. 330 View FIGURES 307–339 ) without sexual characters. Third tarsomere slightly wider than second tarsomere ( Fig. 343 View FIGURES 340–363 ). Claws ( Fig. 355 View FIGURES 340–363 ) with medial teeth as long as half of claw, separated from claw from base. Male genitalia: body of penis ( Fig. 386 View FIGURES 380–387 ) narrow, elongate subparallel-sided until near apex, then gradually narrowing, with subacute tip ( Fig. 421 View FIGURES 397–431 ), nearly as long as apodeme. Female genitalia: spermatheca see Fig. 450 View FIGURES 432–457 ; spiculum ventrale ( Fig. 477 View FIGURES 458–484 ) with arms almost joined for their whole length.

Remarks and comparative notes. This species is closely related to T. sulphureus by its habitus; however, in T. tachengicus the rostrum is shorter, stouter and less tapered in lateral view (especially in the female), the colour of the vestiture is a little variable but never sulphur yellow, third tarsomere slightly wider than second tarsomere, and claws with medial teeth as long as half of claw. Moreover, the aedeagus is distinctly different. Both species are related to T. franzi Caldara, 1986 , which is not known from China. However, in T. franzi the rostrum is short, distinctly tapered from base to apex and poorly sexually dimorphic.

Etymology. The Latin adjective refers to the type locality, Tacheng, at the borders between China and Kazakhstan.

Biology. The specimens of the type series were collected on Alhagi sparsifolia Shap.

Distribution. North-western China (XIN).