Macrotomoderus yintiaoling, Zhao & Wang, 2025

Zhao, Yuchen & Wang, Xinpu, 2025, New species of Macrotomoderus Pic (Coleoptera: Anthicidae) from Southern China, Zootaxa 5660 (3), pp. 389-402 : 398-399

Macrotomoderus yintiaoling sp. nov. (OEêẇ大OiṚDzş)

Figures. 47–57

Type material designated: Holotype: ♂, Yintiaoling (Ȑêĸ), Wuxi County (巫Ị县), Chongqing City , China, 17-VIII-2022, Yun Bu ( SANXU) . Paratypes: 1♂ 1♀, same data as holotype ( SANXU) .

Measurements. Holotype. Total length 3.05 mm; head length 0.55 mm, head width across compound eyes 0.62 mm; pronotum length 0.73 mm, maximum pronotal width 0.57 mm, minimum pronotal width 0.21 mm, elytra length 1.75 mm, combined maximum elytral width 1.21 mm.

Description. Body uniformly brown; antennae, maxillary palps and legs comparatively slightly lighter.

Head rounded subtriangular, slightly glossy dorsally and ventrally; eyes medium, weakly convex; Tempora longer than eye length, rounded narrowing towards head base; head base broadly rounded with slightly truncate 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 midline of head; few longer, erect tactile setae scattered on frons and posterior to compound eyes; antennomere III as long as antennomere II and longer than antennomere IV; antenomeres V to X gradually widen, antennomeres VIII to X are distinctly transverse; terminal antennomere broadly asymmetrically triangular with rounded apex, about 1.9 times as long as penultimate antennomere; terminal maxillary palpomere broadly subtriangular to securiform.

Pronotum (fig. 48) moderately glossy dorsally and laterally, with medially broad and deeply notched postmedian lateral constriction; front margin of anterior lobe broadly rounded, anterior rim thin, with a row of long golden setae; in dorsal view, lateral pronotal fovea broad and deep with anterior denticles folded inward, posterior denticles obscured by dense clusters of brush setae, and the middle denticle slightly obtusely angled (fig. 48a); cavity in lateral wall of pronotum between lateral denticles large; in lateral view, anterior lobe convex, lateral constriction not continues onto disc, lateral pronotal fovea broad with distinct margin of pronotum, 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; a small, nodular-like projection present between the anterior and posterior denticles, near the dorsal of constriction (fig. 48b); pronotal dorsal punctures generally similar to those on head, intervening spaces moderately glossy; lateral margins of pronotum minutely punctured; pronotal setae yellowish, dense, suberect; with scattered longer, erect tactile setae 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 sternite VII and tergite VII broadly rounded at posterior margin, sternite VIII obviously excavated on apical margin; tergite VIII, spiculum gastrale and aedeagus as in figures 53 and 54.

Sexual dimorphism. The female similar to the male.

Diagnosis. M. yintiaoling sp. nov. is similar to M. kurbatovi Telnov, 1998 ( China: Hubei), which is also distributed in the Shennongjia area, but can be distinguished by the constriction area dorsally lacking dense, large punctures. Compared to M. uhmanni ( Telnov, 1998) ( China: Hubei, Sichuan), it shares a similar dorsal constriction area with few punctures, as seen in some M. periclitatus Telnov, 2018 ( China: Yunnan), but the shape of the anterior and posterior margins of the pronotal fovea in M. yintiaoling sp. nov. differs from both M. uhmanni and M. periclitatus .

Etymology. This species is named after the Yintiaoling Mountains, which has the highest peak in Chongqing City and is an extension of the Shennongjia Primitive Forest, where this species was first collected. Noun in apposition.

Distribution. China (Chongqing).

Figures

FIGURES 47–54. Macrotomoderus yintiaoling sp. nov., holotype. (47) habitus of male; (48) Pronotum, (a) dosal view, (b) lateral view; (49) sternite VII, ventral view; (50) tergite VII, dorsal view; (51) sternite VIII, ventral view; (52) tergite VIII, dorsal view; (53) spiculum; (54) aedeagus, (a) ventral view, (b) lateral view. Scale bar: 1 mm for fig. 47; 0.5 mm for figs. 49–54.

FIGURES 55–57. Macrotomoderus yintiaoling sp. nov., paratype, female. (55) sternite VII, ventral view; (56) tergite VII, dorsal view; (57) spermatheca. Scale bar: 0.5 mm.