Didrepanephorus nishiyamai Muramoto, 2006

Qiu, Jian-Yue, Zhao, Ming-Zhi & Xu, Hao, 2021, Description of a new species of the genus Didrepanephorus Wood-Mason, 1878 (Coleoptera: Scarabaeidae: Rutelinae) from China with notes on allied species, Zootaxa 4933 (4), pp. 493-513 : 502-505

Didrepanephorus nishiyamai Muramoto, 2006 ¬广镰'•龟

( Figs. 21–24 , 29–30 , 37–38 , 68 , 70 )

Didrepanephorus nishiyamai Muramoto, 2006: 58 (type locality: “Mts. Daming Shan, Guangxi Prov., China ”), figs. 1–2 (habitus and male genitalia); Krajčík 2007: 67; Krajčík 2012: 93; Zorn & Bezděk 2016: 357.

Type material. This species was originally described based on two males, but the type identity of the specimen displayed in the original publication was not indicated ( Muramoto 2006). Depository of the type material was only given for the holotype, i.e., NSMT, while it was not found when the authors (JYQ & HX) visited there in 2018. Hence, the holotype probably remains in the private collection of Rieko Muramoto.

Additional material examined (7♂♂, 1♀). CHINA: Guangdong: 1♂ ( SYSU, En-344357) , 2011.VI.2, Heishiding, Fengkai , Yun LI leg.; 1♂ ( CTZY) , 2020.VI.12, Nanling Forest Park, Shaoguan , Jun-Qiang XU leg.; 1♂ ( CZMZ) , 2020.VI.19, Nanling Forest Park, Shaoguan, Jun-Qiang XU leg. ; Guangxi: 1♂ ( CTZY) , 2017.V.27, Mount Dayaoshan, Jinxiu, Wen JIN leg.; 1♂ ( MYNU) , 2019.VI–VII, Mount Dayaoshan, Jinxiu County, Wen JIN leg.; 1♂ ( CLC) , 2010.V.17, Mount Dayaoshan , Jinxiu County; 1♀ ( CLC) , 2014.VI.3, Mount Damingshan , Nanning, alt. 650 m.; 1♂ ( CLC) , 2014.VI.6, Mount Damingshan , Nanning, alt. 1,200 m .

Description (female). Body oval and convex. Reddish-brown, hairs and setae yellow ( Fig. 23 ). Head: Clypeus longer than in male, trapezoidal, anterior margin evenly curved and strongly convex; sides strongly convergent anteriad and swollen in basal half, roundly curved in middle, then weakly convergent anteriad to the rounded anterior angle; surface densely rugopunctate; margins with some short setae. Frontal-clypeal suture broadly interrupted medially, represented by a short carina at each side. Frons and vertex densely rugopunctate, basal portions with sparse, semierect short setae. Eye-canthus narrow, not extends beyond outermost point of eye, anterior angle broadly rounded. Antenna reddish-brown, antennal club shorter than longer than antennomeres 2–7 combined. Labrum not visible in dorsal view. Mandible reddish-brown, margin black; nearly triangular; outer edge bidentate, apical tooth acute and bends upwards, second tooth broadly rounded. Maxillary palpi and labial palpi simple. Mentum with sparse punctures, as well as short and long, erect setae, anterior margin slightly concave in middle. Gula reddish-brown, matt. Pronotum: Strongly convex ( Fig. 30 ), about 1.47 times as wide as long, widest near middle. Anterior margin distinctly bisinuate; anterior marginal membrane distinct, reaching anterior angle. Sides slightly concave and convergent posteriad in basal half, roundly and broadly curved at middle, strongly convergent anteriad in apical half. Posterior margin broadly protruding in middle. Basal marginal line interrupted before scutellum, all other marginal lines completed. Anterior angle moderately protruding and blunt at apex, rounded posterior angle slightly protruding. Surface shiny, with moderately dense, large punctures, lateral portions with sparse, semierect short setae. Scutellum: Nearly short triangular, lateral margin feebly curved, apex rounded. Surface with scattered small punctures. Elytra: Convex. Almost as wide as long, widest at middle. Intervals defined by rows of close and large punctures; three inner primary striae feebly convex, narrow, apical halves with scattered small punctures; interstices with dense, irregular large punctures. Humeral umbone and apical umbone convex; apical declivity densely rugopunctate. Surface with moderately dense, semierect short setae. Epipleura glabrous. Ventral thoracic surface: Ventral prothoracic surface with sparse long setae; ventral mesothoracic surface glabrous and smooth at disc, other portions with dense, small punctures and sparse, short setae; ventral metathoracic surfaces with dense, long hairs except the area around midline. Prosternal process small, horizontally broad, shield-liked. Punctures on ventral mesothoracic surface round. Metasternum with a distinct dark midline. Propygidium: Surface coarse, with sparse, semierect, short setae. Pygidium: Moderately convex. Surface coarse, with sparse, small, round punctures and sparse, semierect, short setae. Abdomen: Convex; abdominal ventrite 1 abbreviated medially, abdominal ventrites 2–4 almost equal in length ( Fig. 24 ); posterior margin of abdominal ventrite 6 widely curved. With dense, transverse punctures. Most ventrites with rather short, recumbent setae, which being dense laterally; abdominal ventrite 6 with dense, long, semierect setae. Legs: Femora with sparse punctures; tibiae with dense, coarse and irregular punctures. Protarsal claw simple. Outer meso- and metatarsal claws widely and deeply spilt into two branches respectively, the upper branches thinner, longer and sharper than the lower ones. Inner meso- and metatarsal claws more curved than the outer ones. Protibia with three distinct and acute teeth. Protibial spur long and sharp, situates at the level of middle protibial tooth, vertically orient forwards. Meso- and metatibiae bidentate at apical edges. Protarsus thin; tarsomeres 4 of all legs each with an acute ventroapical protrusion, each protrusion of meso- and metatarsomeres 4 with a pair of spines at base; tarsomeres 5 of all legs with a small and blunt ventral protrusion in basal third.

Measurements. Body length: male 16.5–19.4 mm, female about 20.2 mm; body width: male 8.7–9.6 mm, female about 10.8 mm.

Differential diagnosis. This species resembles Didrepanephorus subvittatus , but can be distinguished by the following characters: dorsal surface of male unicolor (reddish-brown, Figs. 21, 23 ; bicolor in D. subvittatus , Figs. 25, 27 ); male mandibles deeply constricted before base tooth ( Fig. 29 ; slightly constricted in D. subvittatus , Fig. 31 ); anterior margin of male mentum slightly depressed in middle (distinctly depressed in D. subvittatus ); length of male antennal club longer than antennomeres 2–7 combined ( Figs. 21–22 ; shorter in D. subvittatus , Figs. 25–26 ).

Distribution. China: Guangxi, Guangdong (new record).

Remarks. Specimens of Didrepanephorus nishiyamai are rare in the collections. Based on the recent material, the distribution of this species is expanded eastwards to Guangdong province ( Fig. 70 ), and the only known female is also from the type locality.

Figures

FIGURE 70. Known distribution of four Didrepanephorus Wood-Mason, 1878 species. Type locality of D. mucronatus Arrow, 1921 is missing because the precise location is unknown.

FIGURES 21–24. Habitus of Didrepanephorus nishiyamai Muramoto, 2006 (dorsal and ventral view). 21–22, male (Mt. Dayaoshan); 23–24, female (Mt. Damingshan).

FIGURES 29–32. Habitus of Didrepanephorus Wood-Mason, 1878 species (oblique view). 29–30, D. nishiyamai Muramoto, 2006: 29, male; 30, female. 31–32, D. subvittatus Benderitter, 1922: 31, male; 32, female.

FIGURES 33–40. Male genitalia of Didrepanephorus Wood-Mason, 1878 species (showing parameres in dorsal and ventral views). 33–34, D. mucronatus Arrow, 1921; 35–36, D. heterocolor new species (holotype); 37–38, D. nishiyamai Muramoto, 2006; 39–40, D. subvittatus Benderitter, 1922.

FIGURES 65–69. Habitat of Didrepanephorus Wood-Mason, 1878 species. 65–67, habitat D. mucronatus Arrow, 1921: 65, forest in Mount Jinuoshan, Jinghong (Yunnan, China); 66–67, male attracted by light trap and stayed on a nearby bush in Dadu- gang (Yunnan, China); 68, male of D. nishiyamai Muramoto, 2006 on the ground (Guangxi, China; photograph by Chao Li); 69, male of D. subvittatus Benderitter, 1922 attracted by light trap and stayed on a nearby leaf in Mount Shiwandashan (Guangxi, China; photograph by Tao Zhang).

FIGURES 25–28. Habitus of Didrepanephorus subvittatus Benderitter, 1922 (dorsal and ventral view). 25–26, male; 27–28, female. (both from Tam Dao).