Broscosoma gaoligongense Deuve and Wrase 2015

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).6. 高黎贡山步甲（Broscosoma gaoligongense）Deuve & Wrase, 2015 图版7d、10b、20、21、44a、48-50 高黎贡山步甲（Broscosoma gaoligongense）Deuve & Wrase, 2015:29。正模为1头雄虫，保存于DWW。模式产地：中国云南省高黎贡山，六库西北21 km处的山口（风雪丫口[Fengxue Yakou]），海拔3150 m，坐标25.97281°/98.68339°。 鉴别特征：该种成虫（图20a）可通过以下特征组合与区域内其他种类区分：体型中等，雄虫体长（body length, BL）9.0–10.0 mm，雌虫9.6–10.2 mm；头部与前胸背板背面呈黑色或暗栗色，鞘翅具亮绿或蓝绿色金属光泽；颊脊（genal ridge）位于颞后缢缩（post-temporal constriction）基部，仅延伸至缢缩处或略靠前（图10b）；触角节3、4仅端毛轮具刚毛，触角节1–4同色，呈淡红棕色；前胸背板亚基部缢缩前区域（图7d）背面观呈球状，基侧毛缺失；鞘翅轮廓卵圆形，肩角不明显；后转节（metatrochanters）具1根刚毛；雄虫前足跗节1–3跗节腹面具黏毛垫；雄虫外生殖器如图21所示，侧面观阳茎中叶（median lobe）略短粗，端片（apical lamella）对称圆润。 讨论：正如双色步甲（B. bicoloratum）的讨论部分所述，本种是研究区域内4个鞘翅具明显金属光泽，但前体（头部与前胸背板）无金属光泽或仅前胸背板前横沟前部区域具金属光泽的种类之一。高黎贡山步甲可与绿颈步甲（B. viridicollare）区分：前胸背板球状且无金属光泽（绿颈步甲的前胸背板更狭长，前横沟前部区域具明显金属绿光泽）；鞘翅微刻纹消失（绿颈步甲的微刻纹细微但清晰）；小盾旁孔突（parascutellare pore puncture）位于刻点沟3基部附近（绿颈步甲位于刻点沟2）；雄虫阳茎中叶更短且弧曲均匀（图21c）（绿颈步甲的中叶更长，端1/3弧曲更弱，图35c）。与双色步甲的区别为：后转节具1根刚毛（多数双色步甲后转节无毛，仅少数个体单侧具1根刚毛）；小盾旁毛孔位于刻点沟3基部附近（多数双色步甲位于刻点沟2基部）；复眼（图7d）略不突出（双色步甲复眼更突出，图7c）；雄虫阳茎中叶略窄，端片顶端略膨大（双色步甲的中叶略粗厚，端片稍窄，图16c）。与贡山步甲（B. gongshanense）的区别为：鞘翅具明显金属绿光泽（贡山步甲的金属光泽更偏蓝）；小盾旁毛位于刻点沟3基部（贡山步甲位于刻点沟2）；后转节具1根刚毛（贡山步甲后转节无毛）。 正如前文双色步甲讨论部分所述，在研究区域外已知的步甲属（Broscosoma）种类中，仅山地步甲（B. monticola）的类群具有前体无金属光泽、鞘翅具明显金属光泽的特征，与高黎贡山步甲一致。二者的小盾旁毛均位于刻点沟3基部附近，但山地步甲的股节略浅，且雄虫阳茎中叶腹缘具大突起（见Habu 1973，图6），而高黎贡山步甲雄虫中叶无此结构。 生境与分布：白日于山口（风雪丫口）两侧的竹丛与杜鹃灌丛的路堑边缘有机基质下的石块下采获少量个体（图44a）。多数标本于夜间借助头灯采获，发现它们在地表活动，尤其多见于苔藓、灌丛及路堑岸坡。该种分布于中等海拔区域，记录的海拔范围为3120–3150 m（图49）。 高黎贡山内地理分布：图20b。共检视35号标本（23雄12雌），采自以下地点：泸水县：鲁掌镇（片马公路风雪丫口处，25.97228°/98.68336°，海拔3150 m，2005年5月11日，D.H. Kavanaugh、H.B. Liang、C.E. Griswold、D.Z. Dong与K.J. Guo采集 [1雄；加州科学院（CAS）馆藏]；风雪丫口沿片马公路向东0.5 km处，25.97288°/98.68336°至25.97347°/98.68780°，海拔3130–3150 m，2005年5月17日，D. Kavanaugh、C.E. Griswold、H.B. Liang与D.Z. Dong采集 [1雌，中国科学院动物研究所（IOZ）馆藏]）；片马镇（风雪丫口沿片马公路向西0.6 km处，25.97228°/98.68336°至25.974108°/98.67716°，海拔3120–3150 m，2005年5月17–19日，D. Kavanaugh、C.E. Griswold、H.B. Liang、D.Z. Dong与K.J. Guo采集 [22雄11雌；CAS、IOZ馆藏]）。 该种仅在研究区域中南部高黎贡山山脊的泸水县采获，该区域跨核心区4与5（图48）。 总地理分布：目前仅知该种分布于中国云南省西部高黎贡山中南部山脊的模式产地及其邻近区域，即泸水县境内。 与其他步甲属种类的地理关系：仅在模式产地及其周边区域，该种与肋步甲（Broscosoma ribbei）同域分布（图50）。