Tychius medicaginis C. N. F. Brisout de Barneville, 1863

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 : 21

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.4411301
persistent identifier	https://treatment.plazi.org/id/632E87E8-FFAB-FFE5-E6D5-FEA8FE708788
treatment provided by	Plazi
scientific name	Tychius medicaginis C. N. F. Brisout de Barneville, 1863
status

Treatment

16. Tychius medicaginis C. N. F. Brisout de Barneville, 1863 View in CoL

( Figures 43–46 View FIGURES 37–54 , 167–170 View FIGURES 149–172 , 267–268 View FIGURES 243–274 , 319 View FIGURES 307–339 , 376 View FIGURES 372–379 , 409 View FIGURES 397–431 , 441 View FIGURES 432–457 , 467 View FIGURES 458–484 )

Tychius medicaginis C. N. F. Brisout de Barneville, 1863: 767 View in CoL . Caldara, 1990: 176.

Material examined. CHINA: Xinjiang: Baihaba County, 2-VII-2014 , leg Chunyan Jiang (4); Jimunai County (85°53’N; 47°25’E, 1089 m), 3-VII-2014 GoogleMaps , leg Chunyan Jiang (1); Aletai Beitundaqiao, 28-VI-2014 , leg Chunyan Jiang (1); Baihabacaochang (1153m), 22-VII-2009 , leg Xinlei Huang (11); Changji, 4-VI-1955 , leg Kailing Xia, Yonglin Chen (2); Manasi Shihezi (460-510m), 7-VI-1957 , leg Chunpei Hong (1); Qinghe (1260m), 6-VII- 1960 , leg Shuyong Wang (1); Qinghe Bulukecun, 8-VII-2009 , leg Xinlei Huang (3); Qinghe Takeshiken Buergen (46°10’N; 90°48’E, 1111m), 28-VII-2013 GoogleMaps , leg Chunyan Jiang (1); Qinghe Talatecun, 29-VI-2014 , leg Chunyan Jiang (4); Yining, 4-VI-1991 (1).

Redescription. Length 2.10–2.60 mm ( Fig. 43–46 View FIGURES 37–54 ). Integument blackish brown except for reddish antennae and legs; on dorsum densely covered with narrow, moderately elongate, rectangular to subelliptical, yellowish to grayish scales, sometimes paler on interstria 1 and sides of elytra. Rostrum ( Fig. 167–170 View FIGURES 149–172 ) in lateral view nearly of same width in apical half, distinctly sexually dimorphic (Rl/Rw 4.06–4.88 in male, 4.88–5.00 in female; Rl/Pl 0.87–0.98 in male, 0.94–1.04 in female). Antennal funicle 7-segmented. Eyes convex, distinctly prominent. Pronotum transverse (Pw/Pl 1.19–1.27), with slightly curved sides, widest in front of middle, somewhat convex. Elytra suboval (Ew/Pw 1.18–1.32; El/Ew 1.30–1.46), with moderately rounded sides, widest in basal half, somewhat convex. Femora ( Fig. 267–268 View FIGURES 243–274 ) without tooth. Profemora and protibiae ( Fig. 319 View FIGURES 307–339 ) without sexual characters. Claws with robust medial teeth, as long as 2/3 of claw. Male genitalia: body of penis ( Fig. 376 View FIGURES 372–379 ) with nearly parallel sides in basal half then gradually and distinctly narrowed to apex, with subacute tip ( Fig. 409 View FIGURES 397–431 ), as long as apodeme. Female genitalia: spermatheca ( Fig. 441 View FIGURES 432–457 ) with short ramus and short collum, indistinct nodulus, long cornu distinctly narrowed in apical part; spiculum ventrale ( Fig. 467 View FIGURES 458–484 ) with joined arms in basal 2/3, then very slightly spaced to apex.

Remarks and comparative notes. As above reported, this species is very similar to T. aureolus , from which it differs by the profemur of male without fringe of white scales and the rostrum of female in lateral view nearly of same width from base to apex.

Biology. This species feeds on Medicago such as M. sativa L. and M. falcata L., both considered introduced in China, and is often collected together with T. aureolus ( Clark & Burke 1977; Caldara 1990).

Distribution. Widely distributed in Europe and Asia. Reported also from Tunisia. It was already known from Northwest China (XIN).