Chydaeus obtusicollis Schauberger, 1932

Kataev, Boris M., Liang, Hongbin & Kavanaugh, David H., 2012, Contribution to knowledge of the genus Chydaeus in Xizang Autonomous Region [Tibet] and Yunnan Province, China (Coleoptera, Carabidae, Harpalini), ZooKeys 171, pp. 39-92 : 58-59

Chydaeus obtusicollis Schauberger, 1932 Figs 57 68

Material examined.

A total of 95 specimens (49 males and 46 females, including 23 males and 23 females in CAS, 24 males and 22 females in IOZ, and 2 males and one female in ZIN) were examined from the following localities: China. Xizang Autonomous Region: Cona County: 1 female, 2000 m, 7.VIII.1974 (IOZ). Medog County: 1 male, Medog, Baibung, 850 m, 17.III.1983 (IOZ). Yunnan Province. Gongshan County: 1 female, Dulongjiang, Bapo, along roadside, 27.73902°N, 98.34975°E, 1412 m, 3.XI.2004, H.B. Liang leg. (IOZ); 2 males, 2 females, Gongshan, Dulongjiang, 1 km S of Bapo, 27.73453°N, 98.35042°E, 1333 m, 3.XI.2004, V.F. Lee leg. (IOZ, CAS); 1 male, Dulongjiang, Bapo, along roadside, 27.73902°N, 98.34975°E, 1412 m, 26.X.2004, H.B. Liang leg. (IOZ); 1 female, Dulongjiang, Bapo, Mabiluo, riverside, 27.76208°N, 98.34567°E, 1503 m, 27.X.2004, H.B. Liang leg. (IOZ); 3 males, 2 females, Dulongjiang, Maku village, roadside, 27.68533°N, 98.30425°E, 1823 m, 2.XI.2004, H.B. Liang leg. (CAS, IOZ, ZIN); 1 male, same data, but 1.XI.2004 (IOZ); 2 females, Dulongjiang, Maku village, roadside, 27.68533°N, 98.30425°E, 1823 m, 1.XI.2004, H.B. Liang leg.(CAS, IOZ); 1 female, Dulongjian, 0.5 km WSW Maku, trail, 27.68310°N, 98.30038°E, 1845 m, 29.VIII.2006, D. Kavanaugh leg. (CAS); 1 male, Dulongjiang, Lawaduo, roadside, 27.69666°N, 98.34934°E, 1466 m, 4.XI.2004, H.B. Liang leg. (IOZ); 2 females, Dulongjiang, Kongdang, roadside, 27.87696°N, 98.33587°E, 1525 m, 5.XI.2004, H.B. Liang leg. (IOZ); 3 males, 3 females, Dulongjiang, Kongdang, roadside, 27.87696°N, 98.33587°E, 1525 m, 25.X.2004. H.B. Liang leg. (CAS, IOZ); 8 males, 3 females, Cikai Town, 0.5 km of Kongdang, 27.88111°N, 98.34063°E, 1500 m, 25.X.2004, D. Kavanaugh leg. (CAS, IOZ); 1 male, Dulongjiang, Bapo, along roadside, 27.73902°N, 98.34975°E, 1412 m, 26.X.2004, H.B. Liang leg. (IOZ); 3 males, Dulongjiang, Pengjiwang, above Bapo, 27.72999°N, 98.40650°E, 2250 m, 28.X.2004, H.B. Liang leg. (CAS, IOZ, ZIN); 1 male, Dulongjiang, Miliwang, above Bapo, 27.72383°N, 98.36117°E, 1956 m, 31.X.2004, H.B. Liang leg. (IOZ); 3 males, 2 females, Dulongjiang, 0.6 km N Dizhengdang, 28.08442°N, 98.32652°E, 1880 m, 29.X.2004, D. Kavanaugh leg. (CAS, IOZ); 1 female, Dulongjiang, S edge of Dizhengdang, 28.07654°N, 98.32603°E, 1890 m, 29.X.2004, D. Kavanaugh leg. (ZIN); 1 male, same data, but 28.X.2004 (IOZ); 1 male, Dulongjiang, Dizhengdang, Silalong He, 28.07654°N, 98.32603°E, 1890 m, 30.X.2004, D. Kavanaugh & D.Z. Dong leg. (CAS); 1 male, 1 female, Dulongjiang, 2.8 km S Longyuan Vill., 28.00905°N, 98.32204°E, 1660 m, 31.X.2004, D. Kavanaugh & D.Z. Dong leg. (CAS); 3 males, 3 females, Dulongjiang, 2.3 km S Longyuan, 28.00532°N, 98.32145°E, 1685 m, 2.XI.2004, D. Kavanaugh leg. (CAS, IOZ); 5 males, 8 females, Dulongjiang, Elidang Village, beach, 28.00287°N, 98.32145°E, 1640 m, 3.XI.2004, D. Kavanaugh & D.Z. Dong leg. (CAS, IOZ); 3 males, 4 females, Dulongjiang, Xianjiudang Village, 27.94092°N, 98.33340°E, 1580 m, 4.XI.2004, D. Kavanaugh & D.Z. Dong leg. (CAS, IOZ); 1 male, Dolongiang Township, Moqie Wang at Gongshan-Dulong Road km 91, 1550 m, 27.90085°N, 98.34721°E, 6.XI.2004, Stop DHK-2004-077, D. Kavanaugh & H.B. Liang leg. (IOZ); 1 male, Dulongjiang, 0.2 km S Mukewang He, 27.84125°N, 98.32979°E, 1450 m, 7.XI.2004, D. Kavanaugh & D.Z. Dong leg. (CAS); 5 males, 8 female, Dulongjiang, 0.5 km N Kongdang, 27.88111°N, 98.34062°E, 1500 m, 7.XI.2004, D. Kavanaugh leg. (CAS, IOZ); 2 females, Dulongjiang, Moqiewang He, 27.91040°N, 98.41076°E, 2185 m, 8.XI.2004, D. Kavanaugh & M. Dixon leg. (IOZ). Lushui County: 1 male, Nujiang Prefecture, Gangfang sancha lukou, 26.073°N, 98.345°E, 1500 m, 14-15.X.1998, D.H. Kavanaugh, C.E. Griswold, C. Ferraris & C.L. Long leg. (IOZ).

Distribution.

Fig. 57 . All the previous records for species were restricted to the Central Himalaya, from the eastern part of Nepal to West Bengal (Darjeeling) and Sikkim, at elevations of 1800-2900 m ( Kataev and Schmidt 2006). Specimens recorded here extend the range of Chydaeus obtusicollis eastward to Xizang Autonomous Region (Cona and Medog counties) and northwestern Yunnan Province (Gongshan and Lushui counties), China. The elevational range of Yunnan records extends from 1400 to 2250 m.

Habitat

. Specimens were collected in roadside and road cut open areas ( Fig. 68 ), on open, disturbed stream banks, and in other disturbed areas, hidden under stones and other debris during daylight hours and active on the soil surface at night.

Remarks.

Kataev and Schmidt (2006) included Chydaeus obtusicollis in the semenowi group and redescribed this species based on Central Himalayan specimens. Specimens examined from China are similar to those from the Central Himalaya in the main morphological characteristics, including the male genitalia; but the basal pronotal angles, in some specimens from Yunnan, have more or less distinct apical denticles. The taxonomic status of specimens from Yunnan merits further study. As with populations in the Central Himalaya, Yunnan populations of Chydaeus obtusicollis are dimorphic for wing length, with both brachypterous and macropterous individuals present.

Figures

Figures 56 - 57. Toporelief map of southeastern Asia, illustrating localities for Chydaeus species 56 Chydaeus shunichii Ito = red dots, Chydaeus fugongensis sp. n. = pink diamond, Chydaeus gutangensis sp. n. = yellow square, and Chydaeus hanmiensis sp. n. = light blue triangle 57 Chydaeus baoshanensis sp. n. = dark blue square, Chydaeus asetosus sp. n. = yellow triangles, and Chydaeus obtusicollis Schauberger = red dots. Only new records reported here are shown. Scale bar = 300 km (in 100 km increments).

Figures 68 - 69. Digital photographs of habitats for Chydaeus species 68 Kongdang, Gongshan County, Yunnan Province, China, ca. 1525 m; locality for Chydaeus andrewsi andrewsi Schauberger 69 Dulong Valley N of Kongdang, Gongshan County, Yunnan Province, China, ca. 1550 m; locality for Chydaeus andrewsi andrewsi Schauberger and Chydaeus obtusicollis Schauberger.