Macrotomoderus baoyui, Zhao & Wang, 2025

Zhao, Yuchen & Wang, Xinpu, 2025, New species of Macrotomoderus Pic (Coleoptera: Anthicidae) from Southern China, Zootaxa 5660 (3), pp. 389-402 : 390

Macrotomoderus baoyui sp. nov. (包$大OiṚDzş)

Figures. 1–8

Type material designated: Holotype: ♂, Xiaokeng Grand Canyon (Ñ坑大ūë), Meicun Township (ėťDz), Chizhou City (àṅǖ), Anhui Province (ümå), China, 02-IV-2023, leaf litter, leg. Yu Bao ( SANXU).

Paratypes: 1♂, same data as holotype ( SANXU) .

Measurements. Holotype. Total length 3.05 mm; head length 0.58 mm, head width across compound eyes 0.60 mm; pronotum length 0.73 mm, maximum pronotal width 0.58 mm, minimum pronotal width 0.25 mm, elytral length 1.72 mm, combined maximum elytral width 1.19 mm.

Description. Head, pronotum, and elytra uniformly brown, slightly darker area on the upper rear of eyes; antennae, maxillary palps, and legs yellowish-brown.

Head broadly subtriangular, glossy dorsally and ventrally; eyes medium, moderately convex; tempora slightly longer than eye length, strongly narrowing towards head base, posterior temporal angle broadly rounded; 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, subdecumbent, and directed toward midline 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; antennomeres V to VII gradually widen, antennomeres VIII to X are distinctly transverse; terminal antennomere broadly triangular with rounded apex, about 1.8 times as long as penultimate antennomere; terminal maxillary palpomere broadly triangular.

Pronotum (fig. 2) moderately glossy dorsally and laterally, with broad and medially deeply notched postmedian lateral constriction; front margin of anterior lobe broadly rounded, without anterior rim; lateral pronotal fovea broad and deep in dorsal view, with anterior and posterior denticles appearing nearly right-angled; brush of dense, moderately long, setae clearly visible on posterior denticles (fig. 2a); cavity in lateral wall of pronotum between lateral denticles large; anterior lobe slightly convex in lateral view; lateral constriction continues onto disc in lateral view; lateral pronotal fovea moderately broad, slightly widens upwards towards pronotal disc in lateral view; anterior and posterior margins of fovea each protrudes in a black obtuse triangular denticle, with short, stout brush-like setae beneath anterior and above posterior denticle (fig. 2b); pronotal dorsal punctures generally similar to those on head, becoming larger towards constriction area, intervening spaces moderately glossy; lateral margins of pronotum minutely punctured; pronotal setae yellowish, dense, suberect; 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; sutural stria not present; punctures much stronger and larger than those on dorsal forebody, becoming much smaller and sparser on posterior third of elytra; setae yellowish-brown, rather long and dense, suberect.

Male tergite VII and morphological sternite VII broadly rounded at posterior margin, sternite VIII tranced at posterior margin; spiculum gastrale and aedeagus as in figures 7 and 8.

Diagnosis. This species closely resembles M. jiuhuanus Telnov, 2007 (Anhui) in habitus but differs by sparser pronotal punctures on the constriction area (fig. 2a, vs. densely packed, irregularly circular punctures in M. jiuhuanus ); aedeagus with a slender-elongate apex (fig. 8a, vs. broadly rounded apex in M. jiuhuanus ). M. baoyui sp. nov. can be readily distinguished from M. clavipes ( Champion, 1890) ( Japan: Honshu and Shikoku) by the more slender and elongated morphology of the male aedeagus. The aedeagus of M. baoyui sp. nov. is similar to that of M. wudu Telnov, 2022 , but differs from M. wudu by aedeagus lateral margins subparallel in the apical third (fig. 8a, vs. tapered) and not posteriorly curved (fig. 8b, distinctly recurved dorsally in M. wudu ), and the two species are readily distinguished by habitus.

Etymology. Patronymic. This species is named after the collector, Yu Bao (Chizhou, Anhui, China).

Distribution. China (Anhui).

Figures

FIGURES 1–8. Macrotomoderus baoyui sp. nov., holotype. (1) habitus of male; (2) Pronotum, (a) dorsal view, (b) lateral view; (3) sternite VII, ventral view; (4) tergite VII, dorsal view; (5) sternite VIII, ventral view; (6) tergite VIII, dorsal view; (7) spiculum; (8) aedeagus, (a) ventral view, (b) lateral view. lpf. lateral pronotal fovea; ad. anterior denticle; pd. posterior denticle; Scale bar: 1 mm for fig. 1; 0.5 mm for figs. 3–8.