Macrotomoderus yuexiensis, Zhao & Wang, 2025

Zhao, Yuchen & Wang, Xinpu, 2025, New species of Macrotomoderus Pic (Coleoptera: Anthicidae) from Southern China, Zootaxa 5660 (3), pp. 389-402 : 400-401

Macrotomoderus yuexiensis sp. nov. (aeƃ大OiṚDzş)

Figures. 58–65

Type material designated: Holotype: ♂, Yaoluoping Village (ěă坪ť), Baojia Township (包=乡), Yuexi County (ẽð县), Anqing City (üẑǖ), Anhui Province, China, 18-VI-2019, in rotten wood, leg. Rixin Jiang.

Measurements. Holotype. Total length 3.70 mm; head length 0.75 mm, head width across compound eyes 0.76 mm; pronotum length 0.91 mm, maximum pronotal width 0.76 mm, minimum pronotal width 0.26 mm, elytra length 1.99 mm, combined maximum elytral width 1.46 mm.

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

Head rounded, 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, subdecumbent, and directed toward the middle of head. antennomere III as long as antennomere II and antennomere IV; antenomeres VII to X gradually widen, while antennomeres IX and X transverse; Terminal antennomere asymmetrically triangular with slightly rounded apex, about 1.8 times as long as penultimate antennomere; Terminal maxillary palpomere securiform to semicircle.

Pronotum (fig. 59) glossy dorsally and laterally, with medially broad and deeply notched postmedian lateral constriction; front margin of anterior lobe broadly rounded, without anterior rim; in dorsal view, cavity in lateral wall of pronotum between lateral denticles large; lateral pronotal fovea broad and deep, with anterior and posterior denticles obscured by dense clusters of brush setae, anterior denticles appearing acute-angled (fig. 59a); in lateral view, anterior lobe slightly 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 acute triangular denticle, with short, stout brush-like setae situated beneath the anterior and above the posterior denticle (fig. 59b); pronotal dorsal punctures generally similar to those on head, intervening spaces moderately glossy; lateral margins of pronotum minutely punctured; constriction area dorsally within a longitudinal elliptical region, with dense, large, irregularly circular punctures, separated by much less than puncture diameters; pronotal setae yellowish, dense, subdecumbent; 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 third of elytra; setae yellowish, dense and suberect.

Male tergite VII broadly rounded at posterior margin, sternite VII excavated on apical margin, sternite VIII shallowly excavated on apical margin; spiculum gastrale and aedeagus as figures 69 and 70.

Diagnosis. M. yuexiensis sp. nov. is similar to M. andibani Telnov, 2007 in the male sternite VII and aedeagus, but it can be distinguished by M. yuexiensis irregularly punctures on the pronotum are slightly broader and densely distributed (narrower and less densely in M. andibani ), and the apical portion of the aedeagus is proportionally broader (narrower and more tapered in M. andibani ); M. yuexiensis sp. nov. also resembles M. kurbatovi Telnov, 1998 , but it can be distinguished by the more numerous and denser punctures in the dorsal constriction area of the pronotum and the distinct denticle in dorsal view; M. yuexiensis sp. nov. undoubted is most similar to M. jiuhuanus Telnov, 2007 , which is also found in Anhui, China, they share a similar shape of the head base and the arrangement of punctures in the dorsal constriction area of the pronotum, but M. yuexiensis sp. nov. has a slightly wider pronotum, lacks the forward-extending longitudinal ridge in the middle of dorsal constriction area, and its punctures relatively deeper, the male sternite VII of this species is excavated on the apical margin, and the aedeagus with a rounded apex without any notches, also being slightly wider than that of M. jiuhuanus .

Etymology. Named after the type locality.

Distribution. China (Anhui).

Figures

FIGURES 58–65. Macrotomoderus yuexiensis sp. nov., holotype. (58) habitus of male; (59) Pronotum, (a) dosal view, (b) lateral view; (60) sternite VII, ventral view; (61) tergite VII, dorsal view; (62) sternite VIII, ventral view; (63) tergite VIII, dorsal view; (64) spiculum; (65) aedeagus, (a) ventral view, (b) lateral view. Scale bar: 1 mm for fig. 58; 0.5 mm for figs. 60–65.