Tychius squamulatus Gyllenhal, 1835

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 : 17-18

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.4501830
persistent identifier	https://treatment.plazi.org/id/632E87E8-FFAF-FFE0-E6D5-F9F0FC79802A
treatment provided by	Plazi
scientific name	Tychius squamulatus Gyllenhal, 1835
status

Treatment

13. Tychius squamulatus Gyllenhal, 1835 View in CoL

( Fig. 33–34 View FIGURES 19–36 , 157–158 View FIGURES 149–172 , 261–262 View FIGURES 243–274 , 316 View FIGURES 307–339 , 373 View FIGURES 372–379 , 406 View FIGURES 397–431 )

Tychius squamulatus Gyllenhal, 1835: 404 View in CoL . Franz, 1949: 263. Caldara, 1990: 166.

Material examined. CHINA: Gansu: Zhangye , 11-VII-1962, leg Hongxing Li (1) .

Redescription. Length 1.80–2.60 mm ( Fig. 33–34 View FIGURES 19–36 ). Integument dark brown except for reddish apical half of rostrum, antennae and legs; on dorsum almost completely hidden by subelliptical light brown scales confusedly arranged on elytral interstriae. Rostrum ( Fig. 157–158 View FIGURES 149–172 ) in lateral view slightly curved (Rl/Rw 4.12–4.22; Rl/Pl 0.85–0.94 in male; Rl/Rw 4.27–4.32; Rl/Pl 0.88–1.00 in female). Antennal funicle 7-segmented. Eyes globose convex, prominent. Pronotum transverse (Pw/Pl 1.13–1.20), slightly rounded at sides, convex. Elytra suboval (El/ Ew 1.33–1.51; Ew/Pw 1.23–1.30). Profemora ( Fig. 261 View FIGURES 243–274 ) unarmed, metafemora ( Fig. 262 View FIGURES 243–274 ) with big tooth. Protibiae ( Fig. 316 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. 373 View FIGURES 372–379 ) thin, long, parallel at sides on dorsal view, constricted only until near apex, without tip, slightly longer than apodeme, apex ( Fig. 406 View FIGURES 397–431 ) flat. Female genitalia ( Caldara 1990): spermatheca with short ramus slightly curved backward, distinct short collum, robust nodulus, long cornu distinctly narrowed in apical third; spiculum ventrale with parallel-sided moderately wide arms, slightly spaced but joined near apex.

Remarks and comparative notes. This species can be separated from other Chinese species by the rostrum shape, the pattern of the elytral vestiture and the distinct tooth of the metafemora.

Biology. It is well known that the host plant of this species is Lotus corniculatus L., where larvae feed on the seeds ( Caldara 1990, Skuhrovec et al. 2014). This plant is also widely distributed in China.

Distribution. This species is widely distributed in central and southern Europe, England, Anterior Asia ( Iran, the Caucasus, Anatolia) and Algeria. New record from China (GAN).