Tychius picirostris ( Fabricius, 1787 )

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 : 26-27

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.4411313
persistent identifier	https://treatment.plazi.org/id/632E87E8-FFA6-FFEB-E6D5-FA28FCD5809A
treatment provided by	Plazi
scientific name	Tychius picirostris ( Fabricius, 1787 )
status

Treatment

23. Tychius picirostris ( Fabricius, 1787) View in CoL

( Figures 67–72 View FIGURES 55–72 , 191–194 View FIGURES 173–196 , 279–282 View FIGURES 275–306 , 326 View FIGURES 307–339 , 382 View FIGURES 380–387 , 417 View FIGURES 397–431 , 447 View FIGURES 432–457 , 473 View FIGURES 458–484 )

Curculio picirostris Fabricius, 1787: 101 View in CoL . Clark, 1984: 45 ( Tychius View in CoL ). Caldara, 1990: 200 ( Tychius View in CoL ).

Tychius posticus Gyllenhal, 1835: 423 View in CoL . Caldara, 1990: 200.

Material examined. CHINA: Jilin: ErdaoBaihe Huanshanxian (42°0’N; 127°37’E), 17-VI-2015, leg Chunyan Jiang (16); GoogleMaps ErdaoBaihe X 122, (42°14’N; 28°10’E), 16-VI-2015, leg Chunyan Jiang (19); GoogleMaps Fusong Baixichalu (42°4’N; 127°40’E), 17-VI-2015, leg Rinzhi Zhang, Chunyan Jiang (1); GoogleMaps Fusong Manjiang Huanshanxian (42°0’N; 127°39’E), 10-VI-2015, leg Chunyan Jiang (77) GoogleMaps .

Redescription. Length 1.80–2.25 mm ( Fig. 67–70 View FIGURES 55–72 ). Integument blackish brown except for reddish apical half of rostrum, scape and first segments of funicle of antennae, tibiae and tarsi, sometimes also elytra and femora reddish ( Fig. 71–72 View FIGURES 55–72 ); on dorsum moderately visible between recumbent elongate seta-like grayish to yellowish scales, arranged on elytral interstriae in 2–4 irregular rows; only a few broad whitish scales at base of pronotum and on scutellum. Rostrum ( Fig. 191–194 View FIGURES 173–196 ) moderately curved in lateral view (Rl/Rw 4.17–5.00 in male, 5.42–5.50 in female; Rl/Pl 0.85–1.00 in male, 0.90–1.00 in female). Antennal funicle 6-segmented. Eyes slightly prominent. Pronotum moderately wider than long (Pw/Pl 1.12–1.25), with sides weakly rounded from base. Elytra oblong (El/Ew 1.45–1.55; Ew/Pw 1.23–1.38), widest at middle. Femora ( Fig. 279–282 View FIGURES 275–306 ) unarmed. In male profemora with fringe of hair-like scales, protibiae ( Fig. 326 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. 382 View FIGURES 380–387 ) slightly enlarged from base to apex on dorsal view, narrowed only near to apex, with narrow blunted tip ( Fig. 417 View FIGURES 397–431 ), as long as apodeme. Female genitalia: spermatheca ( Fig. 447 View FIGURES 432–457 ) with parallel-sided long ramus, thin short collum, robust nodulus and robust cornu moderately narrowed only at apex; spiculum ventrale ( Fig. 473 View FIGURES 458–484 ) with joined arms in basal 2/3, then very slightly spaced and parallel to apex.

Remarks and comparative notes. Due to the 6-segmented antennal funicle (instead of seven), this taxon is clearly distinguishable from several other species that are otherwise very similar, such as T. stephensi , T. bicolor , T. aureolus and T. medicaginis . Apart from the shape of the genitalia, the shape of the rostrum is also a good distinctive character.

Biology. This species feeds mainly on Trifolium repens L., but is also reported as living on T. pratense L. and T. hybridum L. ( Clark & Burke, 1977; Caldara, 1990).

Distribution. This species is very common in Europe and Asia and is here recorded as new from China (JIL). It has also been introduced in Japan and North America.