Broscosoma gaoligongense Deuve and Wrase 2015
Creators: name: Kavanaugh, David H.
name: Liang, Hongbin
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Broscosoma
Broscosoma gaoligongense

description: 6. Broscosoma gaoligongense Deuve and Wrase, 2015
Figures 7d, 10b, 20, 21, 44a, 48-50
Broscosoma gaoligongense Deuve and Wrase, 2015:29. Holotype, a male, deposited in DWW. Type locality:
China, Yunnan, Gaoligong Shan, pass [Fengxue Yakou] 21 km NW of Liuku, 3150 m, 25.97281°/ 98.68339°.
Diagnosis. Adults of this species (Fig. 20a) can be distinguished from those of other species in the region by the following combination of character states: size moderate, BL male = 9.0–10.0 mm, female = 9.6–10. 2 mm; dorsum of head and pronotum black or dark piceous, elytra with bright green or blue-green metallic reflection; genal ridge evident basal to post-temporal constriction but extended only to or slightly anterior to the constriction (Fig. 10b); antennomeres 3 and 4 glabrous except for apical whorl of setae, antennomeres 1 through 4 concolorous, pale rufous; pronotum anterior to sub-basal constriction (Fig. 7d) globose in dorsal view, basolateral setae absent; elytral silhouette ovoid, with humeri indistinct; metatrochanters unisetose; male protarsi with tarsomeres 1 to 3 with ventral pads of adhesive setae; male genitalia as in Fig. 21, with median lobe slightly shorter and thicker and apical lamella more symmetrically rounded in lateral view.
Comments. As noted in the Comments section for B. bicoloratum, this is one of four species in the study area members of which have the elytra with distinct metallic reflection but the forebody (head and pronotum) without metallic reflection or with that reflection confined to the pronotal area anterior to the anterior transverse impression. Specimens of B. gaoligongense can be distinguished from those of B. viridicollare in having the pronotum globose and without a trace metallic reflection (pronotum more elongate and with the area anterior to the anterior transverse impression with a distinct metallic green reflection in B. viridicollare), the elytral microsculpture effaced (finely impressed but distinct in B. viridicollare), the parascutellare pore puncture inserted near the base of stria 3 (stria 2 in B. viridicollare), and the median lobe of the male genitalia shorter and more evenly arcuate (Fig. 21c) (longer and less arcuate in apical third (Fig. 35c) in B. viridicollare). They differ from specimens of B. bicoloratum in having the metatrochanters unisetose (asetose in most B. bicoloratum, but one seta present unilaterally in a few specimens), the parascutellar setiferous pore inserted near the base of stria 3 (near base of stria 2 in most B. bicoloratum specimens), the eyes (Fig. 7d) slightly less convex (more convex in B. bicoloratum (Fig. 7c)), and the median lobe of male genitalia slightly narrower and with the apical lamella slightly more expanded apically (median lobe slightly thicker and with a slightly narrower apical lamella (Fig. 16c) in B. bicoloratum). They differ from members of B. gongshanense in having the elytra with a distinct metallic green reflection (metallic reflection distinctly more bluish in B. gongshanense), the parascutellar seta inserted at the base of stria 3 (stria 2 in B. gongshanense), and the metatrochanter unisetose (asetose B. gongshanense).
As noted above in the Comments section for B. bicoloratum, among Broscosoma species known from outside the study area, only B. monticola has members with the forebody lacking metallic reflection and the elytra with markedly metallic reflection as is seen in B. gaoligongense specimens. They also also have the parascutellar seta inserted near the base of stria 3; but they have the femora slightly paler and the median lobe of the male genitalia with a large protuberance on the ventral margin (see Habu 1973, fig. 6), which is absent from the median lobe of B. gaoligongense males.
Habitat distribution. A few members of this species were found under stones on organic substrate along the edges of the roadcut through bamboo and Rhododendron thickets (Fig. 44a) on both sides of the pass (Fengxue Yakou) during the day. The majority of specimens were collected at night, with the aid of headlamps, where they were found active on the surface of the ground, especially on mosses, in thickets and on the banks of the roadcut. This species is found at moderately high elevations, with our records documenting its occurrence in the 3120 to 3150 m range (Fig. 49).
Geographical distribution within the Gaoligong Shan. Fig. 20b. We examined a total of 35 specimens (23 males and 12 females) from the following localities: Lushui County: Luzhang Township (Pianma road at Fengxue Yakou, 25.97228º/098.68336º, 3150m, 11 May 2005, D.H. Kavanaugh, H.B. Liang, C E. Griswold, D.Z. Dong & K.J. Guo collectors [one male; CAS]; Fengxue Yakou to 0.5 km E on Pianma Road, 25.97288°/98.68336° to 25.97347°/98.68780°, 3130- 3150 m, 17 May 2005, D. Kavanaugh, C.E. Griswold, H.B. Liang, & D.Z. Dong collectors [one female, IOZ]); Pianma Township (Fengxue Yakou to 0.6 km W on Pianma Road, 25.97228º/98.68336º to 25.974108º/98.67716º, 3120-3150 m, 17-19 May 2005, D. Kavanaugh, C.E. Griswold, H.B. Liang, D.Z. Dong & K.J. Guo collectors [22 males and 11 females; CAS, IOZ]).
Members of this species were collected only in Lushui County on the crest of the Gaoligong Shan in the southcentral part of the study area, an area that staddles Core Areas 4 and 5 (Fig. 48).
Overall geographical distribution. This species currently is known only from the type locality and its immediate environs in Lushui County on the crest of the southcentral part of the Gaoligong Shan, in western Yunnan Province, China.
Geographical relationships with other Broscosoma species. Members of this species have been found syntopic only with those of Broscosoma ribbei at and around the type locality (Fig. 50).
description: Published as part of Kavanaugh, David H. & Liang, Hongbin, 2021, Inventory of the Carabid Beetle Fauna of the Gaoligong Mountains, Western Yunnan Province, China: Species of the Tribe Broscini (Coleoptera: Carabidae)., pp. 85-182 in Proceedings of the California Academy of Sciences 67 (4) on pages 121-123, DOI: 10.5281/zenodo.11067355