Broscosoma wuyishanum Jiang & Chen, 2023

Jiang, Ri-Xin & Chen, Xiang-Sheng, 2023, New species and distributional records of the genus Broscosoma Rosenhauer, 1846 (Coleoptera, Carabidae, Broscinae) from Fujian, China, Zootaxa 5244 (1), pp. 89-95 : 90-93

Broscosoma wuyishanum Jiang & Chen , sp. nov. (ǨØƜƗ步m)

Figs. 1–3

Type material (4 JJ, 3 ♀♀): Holotype: CHINA: ♁, labeled ‘ China: Fujian, Nanping City (MṮffl), Wuyishan City (ǨØƜffl), Xingcun Town (KḤffi), Tongmu Village (ÑϮḤ), Mali ( ÞƤ) , H: 1400m, 01.X.2021, Peng-Yu Liu & Liang Guo leg.’ ( GUGC) . Paratypes: (3 JJ, 3 ♀♀): with the same label data as the holotype (2 ♁♁, 2 ♀♀, GUGC; 1 ♁, 1 ♀, FAFS) .

Diagnosis. Body shiny, dark brown to black with legs, labrum, palpi and antennae slightly lighter. Frontal grooves irregular and impunctate, labrum with six setigerous punctures, clypeus with two setigerous punctures. Pronotum globose, with a pair of setigerous punctures. Elytra with eight distinct striae, shoulders largely rounded, each elytron with a setigerous punctures at base, two setigerous punctures near apex and two setigerous punctures near lateral margin.

Description. Body ( Fig. 1A ) dark brown to black, slender and distinctly convex, dorsal surface much shiny.

Head ( Fig. 2B ) wider than long, finely convex, dorsal surface shiny, covered with sparse tiny punctures, frontal grooves irregular and impunctate. Labrum nearly rectangular, with six setigerous punctures and weakly emarginate at apical margin. Apical margin of clypeus slightly emarginate with two setigerous punctures located at each side. Eyes large, supraorbital setae on the level of rear margin of eyes. Antenna longer than the combination of head and pronotum. Antenna ( Fig. 2A ) longer than sum of head and pronotum, antennomeres I–IV glabrous, V–XI densely pubescent.

Pronotum ( Fig. 2B ), globose, distinctly convex, slightly longer than wide, widest slightly anterior to the middle, equally constricted at anterior and basal margins, dorsal surface shiny and covered with tiny punctures. Median longitudinal impression and anterior impression shallow but distinct. One pair of setigerous punctures located at anterior middle of lateral margin of pronotum.

Elytra ( Fig. 2C ) longer than wide, strongly convex, dorsal surface shiny, each elytron with eight distinct striae. Scutellum nearly triangular, small. Shoulders largely rounded, narrow. Each elytron with five setigerous punctures, two of them located near basal elytra, other three located near apical elytra. The inner setigerous punctures of basal elytra located at base of stria II, outer punctures located at shoulders; the inner apical setigerous punctures located near apex of stria III, the middle puncture located at apex of stria VIII, the outer puncture located at apical 1/5 of stria VIII.

Legs simple, glabrous, only tibial apex with a few thin setae, protarsomeres 1–3 slightly dilated in males, with adhesive setae ventrally.

Median lobe of aedeagus ( Fig. 3A ) simple, ending in a widely rounded tip; right paramere ( Fig. 3C ) slender and arcuate, acutely angular at apex, with dense long setae along apical margin; left paramere ( Fig. 3B ) expanded at middle and at apex, apex rounded, with two short setae. Female ( Fig. 1B ) with parotarsomeres not dilated basally. Ovipositor smooth arched, basal segment of ovipositor ( Fig. 3D ) with at least eight long setae and apical segment with a thin and long seta.

Measurements (mm). Males: BL 9.22–9.36; HL 1.14–1.24, HW 1.58–1.62; PL 2.78–2.84, PW 2.27–2.2.31; EL 5.24–5.34, EW 3.58–3.61. Females: BL 9.31–9.52; HL 1.15–1.26, HW 1.59–1.65; PL 2.85–2.91, PW 2.32–2.38; EL 5.31–5.35, EW 3.56–3.59.

Distribution. China: Fujian Province ( Fig. 4C ).

Biological notes. Both females and males were collected on the lower surface of a damp cliff at night ( Fig. 4A–B ).

Etymology. The specific epithet refers to the type locality, Wuyishan Mountain (Wuyishan City, Fujian, China), adjective.

Remarks. Compared with other two known Broscosoma species ( B. zhengyuandongi Jiang, Feng & Wang, 2020 and B. guoliangi Jiang, Liu & Wang, 2021 ) which are also discovered from Fujian, the new species can be readily distinguished from them by the following characters: 1) body larger,> 9 mm (cf. <8 mm); 2) median lobe of aedeagus ending in a widely rounded tip (cf. median lobe of aedeagus with apex narrowed); 3) femora black or dark brown (cf. brown in B. zhengyuandongi and reddish brown in B. guoliangi ). The new species can be easily distinguished from Taiwanese species Broscosoma uenoi Habu, 1973 by the much larger body size, deep striae on elytra and the black or dark brown femora.

Figures

FIGURE 1. Dorsal habitus of Broscosoma wuyishanum sp. nov. A. Male; B. Female.

FIGURE 2. Diagnostic features of Broscosoma wuyishanum sp. nov. A. Antenna; B. Head and pronotum, dorsal view; C. Elytra, dorsal view. Features in red: sut, elytral suture; s1‒s8, elytral striae; red dots: setigerous punctures.

FIGURE 3. Diagnostic features of Broscosoma wuyishanum sp. nov. A. Male, aedeagus, lateral view; B. Ditto, Left paramere; C. Ditto, right paramere; D. Ovipositor. Red dots: setae.

FIGURE 4. A. General environment of the type locality of Broscosoma wuyishanum sp. nov; B. Living adult of B. wuyishanum sp. nov; C. distributional map of known Broscosoma species from Fujian Province.