Tychius kaszabi ( Bajtenov, 1977 )

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 : 35-36

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.4411357
persistent identifier	https://treatment.plazi.org/id/632E87E8-FF9D-FFD2-E6D5-FA3EFBDF8654
treatment provided by	Plazi
scientific name	Tychius kaszabi ( Bajtenov, 1977 )
status

Treatment

32. Tychius kaszabi ( Bajtenov, 1977) View in CoL

( Figures 103–108 View FIGURES 91–108 , 225–230, 229–300 View FIGURES 221–242 View FIGURES 243–274 View FIGURES 275–306 , 335–336 View FIGURES 307–339 , 348, 360 View FIGURES 340–363 , 391–392 View FIGURES 388–396 , 427–428 View FIGURES 397–431 , 454 View FIGURES 432–457 , 481 View FIGURES 458–484 )

Lepidotychius kaszabi Bajtenov, 1977: 160 View in CoL . Caldara, 1986: 189 ( Tychius View in CoL ).

Material examined. CHINA: Xinjiang: Habahe County (47°50’N; 86°16’E, 456 m), 2-VIII-2013, leg You Li (35). Tibet: Linzhi, Hedysarum sp., 11-VIII-1987, leg Naifei Wang (1). Inner Mongolia: Otog Qianqi, Aozhen (38°9’N; 107°30’E; 1337 m), Hedysarum fruticosum var. mongolicum , 19-V-2019, leg Chunyan Jiang, Xiaoliang Yang (1); Chengchuan (37°53’N; 108°1’E, 1360 m), Hedysarum fruticosum var. mongolicum , 21-V-2019, leg Chunyan Jiang, Xiaoliang Yang (3); Dashatou (38°9’ N 107°34’E, 1345 m), Hedysarum fruticosum var. mongolicum , 22-V-2019, leg Chunyan Jiang, Xiaoliang Yang (4). Shaanxi: Jingbian, Niuyuqin desertification control farm (37°38’N; 108°32’ E, 1347 m), Hedysarum fruticosum var. mongolicum , 21-V-2019, leg Chunyan Jiang, Xiaoliang Yang (4); Yulin Dingbian (1400 m), Hedysarum fruticosum var. mongolicum , 13-VII-1987 (1).

Redescription. Length 2.60–3.00 mm ( Fig. 103–106 View FIGURES 91–108 ). Vestiture pale yellow in colour, pronotum with flat moderately imbricated rectangular and subelliptical scales, elytral interstriae both with wide subelliptical scales in double to triple rows and narrower scales in a median row. Rostrum ( Fig. 225–228 View FIGURES 221–242 ) elongate (Rl/Rw 5.00– 5.77 in male, 6.36–6.64 in female; Rl/Pl 0.70–0.88 in male, 0.80–0.88 in female), curved, distinctly sexually dimorphic. Eyes slightly convex. Pronotum subquadrate (Pw/Pl 1.08–1.17), parallel-sided in basal half. Elytra elongate (El/Ew 1.47–1.56; Ew/Pw 1.32–1.42), subrectangular.Femora ( Fig. 229–300 View FIGURES 221–242 View FIGURES 243–274 View FIGURES 275–306 ) unarmed, tibiae ( Fig. 335–336 View FIGURES 307–339 ) without sexual characters. Third tarsomere distinctly wider than second tarsomere ( Fig. 348 View FIGURES 340–363 ). Claws ( Fig. 360 View FIGURES 340–363 ) with robust medial teeth, as long as 2/3 of claw, fastened to claw in basal half. Male genitalia: body of penis ( Fig. 391 View FIGURES 388–396 ) moderately wide and with sides slightly convergent in basal 2/3, then distinctly narrowed and parallel to apex, with wide and blunted tip ( Fig. 427 View FIGURES 397–431 ), with apex in lateral view upturned, a little longer than apodeme. Female genitalia: spermatheca ( Fig. 454 View FIGURES 432–457 ) with long parallel-sided ramus, short robust collum, robust nodulus, cornu gradually narrowing to apex; spiculum ventrale ( Fig. 481 View FIGURES 458–484 ) with arms slightly spaced and convergent in basal third, then joined to apex.

Remarks and comparative notes. This species is peculiar due to the dorsal vestiture which is overall less characteristic than that of the other species in the group, and more similar to other unrelated species. The vestiture of the pronotum, although somewhat variable and more or less dense, is composed by weakly overlapped, rectangular to subelliptical (not rounded) scales. Also, the elytral interstriae are covered with 2–3 irregular rows of broad scales with a median row of seta-like scales and not with only broad, very dense overlapped scales not arranged in rows. We identified the single male specimen collected at Yulin Dingbian ( Fig. 107–108 View FIGURES 91–108 , 229–230 View FIGURES 221–242 ) doubtfully as T. kaszabi , mainly differing from the other specimens by the shape of the aedeagus. In fact, the body of penis ( Fig. 392 View FIGURES 388–396 , 428 View FIGURES 397–431 ) is distinctive, moderately wide and with sides slightly convergent in basal 2/3, then distinctly narrowed and parallel sided to apex, with wide and blunted tip and apex downturned in lateral view. Notably, we did not find the apodemes of the penis in this specimen, as with three specimens of T. gracilitubus (see Discussion).

Biology. Living on Hedysarum sp. (Karasjov 1991). Very recently collected from Hedysarum fruticosum Pall. var. mongolicum (Turcz) B. Fedtsch.

Distribution. This species was previously known only from Mongolia. New record from China (NMO SHA XIN XIZ). It is interesting to note he great distance between this single specimen from Tibet and from all other known specimens of T. kaszabi and, actually, from all of the other members of the group. However, we did not find morphological differences and the host plant belongs to the genus Hedysarum .