Tuberstira pennis, Zhou & Yan & Chen, 2025

Tuberstira pennis sp. nov.

Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4

Type material

( 2 ♂ 3 ♀). Holotype: China • ♂ (Fig. 1 A, B View Figure 1 ); “ 云南绿春县大兴镇巴尺山 ” [ Yunnan, Lvchun County, Daxing Town, Bachishan Mountain ]; 22°57'26"N, 102°26'11"E; alt. 1840 m; 2018. II. 20 [adult reared from larva; this date is the larva collection]; “ 许浩 & 邱见玥 ” [ Hao Xu & Jian-Yue Qiu leg.]; CNU GoogleMaps . Paratypes: China • 1 ♂ [the metatarsomeres I abnormal: the left one notched in outer margin, the right one with a tooth at basal 1 / 4 of outer margin]; same data as for the holotype; MYNU GoogleMaps • 1 ♀ (Fig. 1 C, D View Figure 1 ); same data as for the holotype GoogleMaps • 1 ♀; “ 韶关乳源南岭国家森林公园 ” [ Guangdong, Shaoguan City, Ruyuan County, Nanling National Forest Park ]; 24°55'1"N, 113°2'8"E; 2023. V. 09; “ 刘振华 ” [ Zhen-Hua Liu leg.]; night seeking; CNU GoogleMaps • 1 ♀; “ 广西环江县九万山清水塘 ” [ Guangxi, Huanjiang County, Jiuwan Mountain, Qingshuitang ]; 25°11'59"N, 108°47'46"E; alt. 450 m; 2021. IV. 24; Tang, Peng, Cai & Song leg.; SNUC GoogleMaps .

Description.

Holotype ♂ (Figs 1 A, B View Figure 1 , 2 H View Figure 2 ). Body length 12.2 mm, width 3.6 mm. Body elongate, slightly shiny, about 3.39 × as long as wide; dorsal surface black, except for lighter labrum, labro-epistomal membrane, anterior and posterior margins, lateral portions of pronotum, scutellar shield; antennae light brown, except for apical 2 / 3 antennomere I black, antennomere II – X darker; legs black, except for apical portion of femur, basal portions of tibiae, coxae, tarsi light brown; ventral surface black, except for anterior portion of mesepimeron and ventrite 1, posterior margins of metepisternum, abdominal ventrites light brown. Dorsal surface with few long setae scattered on labrum, epistome, tempora and apical portion of elytra; anterior, posterior margins of pronotum, tibiae and tarsi with short setae; ventral surface with sparse long setae.

Head widest at eye level. Terminal maxillary palpus triangularly elongate with straight, cavate inner surface, broadest at base; labrum transversely cordiform, widest before apical margin, slightly emarginate anteriorly; labro-epistomal membrane trapezoidal, widest at base; epistome transversely rectangular with anterior margin slightly arched backward medially, with sparse minute punctures. Frons separated from epistome by indistinct fronto-epistomal impression, with dense, shallow punctures before and between eyes, convex medially with dense, coarse punctures behind eyes (Fig. 2 A View Figure 2 ). Interocular distance about 0.27 ×, 0.12 × as long as eye diameter dorsally and ventrally, respectively (Fig. 2 A, B View Figure 2 ). Antennae filiform, length ratios of antennomeres I – XI as 70: 24: 46: 54: 53: 55: 49: 47: 44: 36: 171, antennomere XI curved with pointed apex, slightly shorter than the combined length of four preceding antennomeres.

Prothorax about 1.08 × as long as wide, with dense transverse wrinkles on ventral surface (Fig. 2 F View Figure 2 ). Pronotum sparsely punctate, impressed in lateral portions of apical half; central disc elevated longitudinally, triangularly impressed, punctate before posterior margin and after anterior margin, forming an X-shaped ridge, nearly impunctate in elevated portions, with distinct middle groove, carina in mid 1 / 3 and posterior 1 / 5 respectively (Fig. 2 C, G View Figure 2 ); anterior, posterior angles slightly projecting laterally.

Elytra with acute apex (Fig. 2 E View Figure 2 ), 2.46 × as long as wide and 4.68 × as long as prothorax, transversally impressed in anterior 3 / 7 and 4 / 7 (Fig. 2 H View Figure 2 ); strial rows not straight, with punctures separated by distances 1 to 2 × puncture diameter; intervals uneven, some with short strial rows adjacent to long strial rows and scattered punctures (Fig. 2 D View Figure 2 ), odd-numbered intervals with large setigerous tubercles, denser in apical 1 / 3 (Fig. 2 E View Figure 2 ).

Legs thin; profemora slightly flattened in basal 1 / 3, meso- and metatibiae moderately flattened in basal 1 / 2; metatibiae flattened, with inner margin slightly curved in posterior 1 / 2. Abdominal ventrites glossy, with sparse fine setigerous punctures in disc. Defensive glands present, with paired reservoirs attached to the distal 2 / 3 of ventrite V, the terminal oval-shaped, extending to the basal 2 / 3 ventrite IV. Aedeagus curved in basal 1 / 3 in lateral view (Fig. 1 F View Figure 1 ); epinotal pieces of basal piece extending dorsad with acute apex (Fig. 1 H View Figure 1 ); parameres gradually contracted on two sides toward apex, cavate ventrally (Fig. 1 E, G View Figure 1 ), with apex distinctively, transversely expanded in lateral view (Fig. 1 F, H View Figure 1 ).

Female (Fig. 1 C, D View Figure 1 ). Body length 14.5 mm, width 4.8 mm. Frons broadly, distinctively separated from epistome by arched forward fronto-epistomal impression, interocular distance about 0.32 ×, 0.17 × as long as eye diameter dorsally and ventrally, respectively, length ratios of antennomeres I – XI as 79: 23: 53: 57: 58: 58: 57: 56: 52: 44: 158, antennomere XI slightly longer than the combined length of three preceding antennomeres; prothorax about 1.02 × as long as wide, slightly wider than head, anterior angles acute; elytral length 2.38 × as long as width.

Spiculum ventrale slender, fused distally (Fig. 3 B View Figure 3 ). 8 th abdominal sternite elongate, medially divided into two elongate sclerites (Fig. 3 B, D View Figure 3 ).

Ovipositor (Fig. 3 A, C View Figure 3 ) with paraprocts elongate, 1.5 × as long as coxites, baculi of paraprocts longitudinal; 1 st coxite lobe short, with baculi transverse; gonostyli terminal; proctiger nearly 1.5 × as long as paraprocts, distal end of proctigeral baculi situated far before base of coxites.

Female genital tube with a blind, large primary bursa copulatrix, oviduct and a short spermathecal gland, bursa copulatrix with a large sclerite (Fig. 3 A, E View Figure 3 ).

Measurement.

Males: body length 13.4–13.6 mm, body width 3.9–4.0 mm ( N = 2); females: body length 14.7–15.0 mm, body width 4.8–5.0 mm ( N = 3).

Variability.

Some specimens exhibit entirely brown elytra. In certain individuals, the anterior portions of pronotum are elevated, and the area between eyes is impunctate.

Etymology.

The specific epithet is derived from the Latin noun “ pennis ” (meaning “ elytron ”), referring to the setigerous tubercles on the elytra, in combination with the generic name; noun in apposition.

Distribution.

China: Guangdong, Guangxi, Yunnan, Hainan (distribution data based solely on photographic evidence, Fig. 4 D, E View Figure 4 ).

Ecology.

The three specimens from Yunnan were obtained by rearing larvae excavated from decaying logs (Fig. 4 A View Figure 4 ). The female specimen from Guangdong was collected at night on grass (Fig. 4 B View Figure 4 ). The female specimen from Guangxi was collected by shaking shrubs (Fig. 4 C View Figure 4 ).