Macrotomoderus jinyunshan, Zhao & Wang, 2025

Zhao, Yuchen & Wang, Xinpu, 2025, New species of Macrotomoderus Pic (Coleoptera: Anthicidae) from Southern China, Zootaxa 5660 (3), pp. 389-402 : 394-395

Macrotomoderus jinyunshan sp. nov. (DZ云Ɯ大OiṚDzş)

Figures. 28–38

Type material designated: Holotype: ♂, Jinyunshan , Chengjiang Town , Beibei District, Chongqing City, China, 25-X-2017, GPS. 106.3814E, 29.8373N, alt. 775m, Zhizhong Gao & Xuyun Gong ( SANXU) . Paratypes: 2♀, Renhe Village (人和ť), Beibei District, Chongqing City, China, 19-X-2017, GPS. 106.3563E, 29.7822N, alt. 352m, Zhizhong Gao & Xuyun Gong ( SANXU) ; 1♀, Jinyunshan , Chengjiang Town , Beibei District, Chongqing City, China, 24-X-2017, GPS. 106.3882E, 29.8405N, alt. 777m, Zhizhong Gao & Xuyun Gong ( SANXU) ; 1♀, Canal Coal Yard (īñä场), Chengjiang Town , Beibei District, Chongqing City, China, 27-X-2017, GPS. 106.3616E, 29.8381N, alt. 328m, Zhizhong Gao & Xuyun Gong ( SANXU) ; 2♂ 1♀, Qingmuguan Town (ḆÌẍDz), Bishan District ( DƜ 区), Chongqing City, China, 28-X-2017, GPS. 106.2871E, 29.7057N, alt. 485m, Zhizhong Gao & Xuyun Gong ( SANXU) .

Measurements. Holotype. Total length 2.52 mm; head length 0.56 mm, head width across compound eyes 0.52 mm; pronotum length 0.62 mm, maximum pronotal width 0.49 mm, minimum pronotal width 0.17 mm, elytra length 1.33 mm, combined maximum elytral width 1.02 mm.

Description. Head, pronotum, and elytra uniformly brown; antennae, maxillary palps, and legs yellowish-brown.

Head rounded subtriangular, slightly glossy dorsally and ventrally; eyes small, weakly convex; Tempora longer than eye length, rounded narrowing towards head base; head base broadly rounded in dorsal view; punctures on head minute, with intervening spaces glossy and glabrous, much wider than punctures; setae on head yellowish-brown, distinct, suberect, and directed toward the middle of head. Few longer, erect tactile setae scattered on frons and posterior to compound eyes; antennomere III as long as antennomere II and slightly longer than antennomere IV; antenomeres V to X gradually widen, while antennomeres VIII to X are distinctly transverse; Terminal antennomere broadly asymmetrically triangular with rounded apex, about 2 times as long as penultimate antennomere; Terminal maxillary palpomere subtriangular.

Pronotum (fig. 29) moderately glossy dorsally and laterally, with broad and medially deeply notched postmedian lateral constriction; front margin of anterior lobe broadly rounded, without anterior rim; in dorsal view, lateral pronotal fovea broad and deep with anterior denticles appearing acute- to right-angled, and posterior denticles obscured by dense clusters of brush setae (fig. 29a); in lateral view, anterior lobe slightly convex, lateral constriction not continues onto disc, lateral pronotal fovea broad with distinct margin of pronotum, slightly widens upwards towards pronotal disc, anterior and posterior margins of fovea, each protrudes a black straight denticle, with short, stout brush-like setae situated beneath the anterior and above the posterior denticle; cavity in lateral wall of pronotum between lateral denticles large (fig. 29b); pronotal dorsal punctures generally similar to those on head, intervening spaces moderately glossy; lateral margins of pronotum minutely punctured; constriction area dorsally within a small circular region, with dense, large, irregularly circular punctures, separated by much less than puncture diameters; pronotal setae yellowish, dense, suberect; with scattered longer, erect tactile setae present along lateral margins of pronotum.

Scutellar shield minute, rounded apically.

Elytra dorsally elliptical, slightly flattened in lateral view, widened laterally around midlength, lateral margins evenly broadly rounded; shoulders obsolete, apterous species; punctures much stronger and larger than those on dorsal forebody, becoming much smaller and sparser on posterior half of elytra; setae yellowish, rather long and dense, suberect.

Male tergite VII broadly rounded at posterior margin, sternite VII shallowly excavated on apical margin, sternite VIII obviously excavated on apical margin; spiculum gastrale and aedeagus as in figures 34 and 35.

Sexual dimorphism. The female similar to the male, while with shorter antennae and smaller eyes; tergite and sternite VII both broadly rounded at posterior margin.

Diagnosis. M. jinyunshan sp. nov. is similar to M. andibani Telnov, 2007 , from the border of Sichuan and Shaanxi provinces, China, compared to M. andibani , M. jinyunshan sp. nov. has a broader lateral pronotal fovea with anterior denticles appearing right-angled or slightly acute, while in M. andibani , the denticles are obtuse, and the area with irregularly circular punctures on the dorsum of the constriction is smaller in M. jinyunshan sp. nov.; compared to M. jiuhuanus Telnov, 2007 ( China: Anhui), and M. uhmanni ( Telnov, 1998) ( China: Hubei, Sichuan), M. jinyunshan sp. nov. also has a unique pronotal constriction structure, furthermore, the aedeagus morphology differs from that of M. jiuhuanus .

Etymology. This species named after the Jinyunshan Mountain, a mountain located in Beibei District, Chongqing City, part of the Huaying Mountains syncline range. Noun in apposition.

Distribution. China (Chongqing).

Figures

FIGURES 28–35. Macrotomoderus jinyunshan sp. nov., holotype. (28) habitus of male; (29) Pronotum, (a) dosal view, (b) lateral view; (30) sternite VII, ventral view; (31) tergite VII, dorsal view; (32) sternite VIII, ventral view; (33) tergite VIII, dorsal view; (34) spiculum; (35) aedeagus, (a) ventral view, (b) lateral view. Scale bar: 1 mm for fig. 28; 0.5 mm for figs. 30–45.

FIGURES 36–38. Macrotomoderus jinyunshan sp. nov., paratype, female. (36) sternite VII, ventral view; (37) tergite VII, dorsal view; (38) spermatheca. Scale bar: 0.5 mm.