Tychius crassirostris Kirsch, 1871

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 : 22

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.4411305
persistent identifier	https://treatment.plazi.org/id/632E87E8-FFAA-FFE4-E6D5-FC84FCBC85B8
treatment provided by	Plazi
scientific name	Tychius crassirostris Kirsch, 1871
status

Treatment

18. Tychius crassirostris Kirsch, 1871 View in CoL

( Figures 51–54 View FIGURES 37–54 , 175–178 View FIGURES 173–196 , 271–272 View FIGURES 243–274 , 321 View FIGURES 307–339 , 378 View FIGURES 372–379 , 411 View FIGURES 397–431 , 443 View FIGURES 432–457 , 469 View FIGURES 458–484 )

Tychius crassirostris Kirsch, 1871: 48 View in CoL . Franz, 1942: 127. Caldara, 1990: 177.

Tychius auliensis Pic, 1902: 145 View in CoL . Caldara, 1990: 177.

Material examined. CHINA: Beijing: Haidian Shangzhuan Cuihu Park , 16-VII-2008, leg Zhiliang Wang (1) . Heilongjiang: Yalujiang , 20-VI-1943 (4) . Liaoning: Anshan Qianshan , 9-V-1963, leg Hongxing Li (1); Shenyang Dongling, Medicago sp., 27-V-1963, leg Hongxing Li (9) . Shanxi: Wutaishan Nanshansi (1800 m), 10-VI-1964 (1); Wutaishan Zhenhaisi (1800 m), 14-VI-1964, leg Tiesheng Li (1) . Xinjiang: Qinghe Takeshiken Buergen (46°10’N; 90°48’E, 1111 m), 28-VII-2013, leg Chunyan Jiang (1); Qinghe Talaticun, 26-VI-2014, leg Chunyan Jiang (1) GoogleMaps .

Redescription. Length 2.15–2.50 mm ( Fig. 51–54 View FIGURES 37–54 ). Integument brown; on dorsum completely covered with moderately narrow, subelliptical to subrectangular grayish scales irregularly arranged on elytral interstriae; scales on elytral striae only slightly longer. Rostrum ( Fig. 175–178 View FIGURES 173–196 ) markedly stout (Rl/Rw 3.63–3.76 in male, 4.00– 4.06 in female; Rl/Pl 0.73–0.83 in male, 0.77–0.87 in female), in lateral view abruptly tapered at apical third. Antennal funicle 7-segmented. Eyes large, weakly prominent. Pronotum slightly transverse (Pw/Pl 1.11–1.24), with slightly curved sides in basal half. Elytra oblong (Ew/Pw 1.21–1.36; El/Ew 1.40–1.55), slightly rounded from base, wider in basal half. Metafemora ( Fig. 272 View FIGURES 243–274 ) with small sharp tooth. In male profemora ( Fig. 271 View FIGURES 243–274 ) with fringe of seta-like scales. Protibiae ( Fig. 321 View FIGURES 307–339 ) with long setae, without sexual characters. Claws with robust medial teeth, as long as half of claw. Male genitalia: body of penis ( Fig. 378 View FIGURES 372–379 ) with slightly sinuous sides, narrowing only until near apex ending in a subacute tip ( Fig. 411 View FIGURES 397–431 ), distinctly curved in lateral view, nearly as long as apodeme. Female genitalia: spermatheca ( Fig. 443 View FIGURES 432–457 ) with small short ramus, short stout collum, robust nodulus and robust cornu only slightly narrowed at apex; spiculum ventrale ( Fig. 469 View FIGURES 458–484 ) with poorly sclerotized large arms joined at base, then thin distinctly sclerotized and moderately spaced, finally newly almost joined at apex.

Remarks and comparative notes. The main feature which allows separation of this species from the others of its group, and especially from those having the rostrum distinctly attenuate in the apical half, T. junceus , T. aureolus and T. flavus , is the stout rostrum in both sexes as well as the shape of the male genitalia.

Biology. This species feeds on Melilotus ( M. officinalis G. G., M. macrorhiza Pers. , M. alba Lam. ) and possibly also on Medicago ( M. sativa L., M. falcata L.) ( Caldara, 1990), all species which are distributed in China.

Distribution. This species is widely distributed in Europe (except for the northern countries) and western and central Asia. New record from China (BEI HEI LIA SHX XIN).