Macrotomoderus jiangrixini, Zhao & Wang, 2025

Zhao, Yuchen & Wang, Xinpu, 2025, New species of Macrotomoderus Pic (Coleoptera: Anthicidae) from Southern China, Zootaxa 5660 (3), pp. 389-402 : 393

Macrotomoderus jiangrixini sp. nov. (Əă大OiṚDzş)

Figures. 17–27

Type material designated: Holotype: ♂, Mingfenggu (凤ḛë), Jianfengling (尖ḃĸ), Ledong Li Autonomous County (乐东ṣânā县), Hainan Province ( DZ 南å), China, 21-IV-2018, GPS. 108.8389E, 18.7453N, alt. 1126m, leg. Rixin Jiang (姜Pš) ( SANXU) . Paratypes: 2♂♂ 2♀♀, same data as holotype ( SANXU) .

Measurements. Holotype. Total length 5.12 mm; head length 0.83 mm, head width across compound eyes 0.94 mm; pronotum length 1.22 mm, maximum pronotal width 0.96 mm, minimum pronotal width 0.45 mm, elytra length 3.02 mm, combined maximum elytral width 2.23 mm.

Description. Head and pronotum uniformly brown, elytra comparatively slightly darker; antennae brown, with apical slightly lighter, maxillary palps and tarsus yellowish-brown, tibia and femur brown.

Head broadly subpentagonal, glossy dorsally and ventrally; eyes medium, protruding beyond lateral or dorsal outline of head; tempora longer than eye length, strongly narrowing towards head base, posterior temporal angle absent; head base broadly rounded in dorsal view; punctures on head obvious, with intervening spaces glossy and glabrous, 2–4 times of diameter of punctures; setae on head whitish to brownish, distinct, subdecumbent to decumbent, and directed toward the middle of head; tactile setae inconspicuous; antennomere III approximately twice length of antennomere II, and as long as antennomere IV; antennomeres V to X with similar length, gradually increasing slightly, but not transverse; terminal antennomere is broadly conical, with rounded apex, approximately 1.4 times of penultimate; terminal maxillary palpomere securiform.

Pronotum (fig. 18) broader than head across eyes, length greater than width, moderately glossy dorsally and laterally, with narrow and medially deeply notched postmedian lateral constriction; front margin of anterior lobe broadly rounded, without anterior rim; in dorsal view, lateral pronotal fovea relatively narrow, anterior denticles appearing acute-angled, posterior denticles inconspicuous (fig. 18a); cavity in lateral wall of pronotum between lateral denticles moderate; in lateral view, anterior lobe convex, lateral constriction not extending onto disc, lateral pronotal fovea relatively narrow with distinct margin of pronotum, slightly widening towards the disc, anterior margins of fovea denticles black broad semicircle and posterior margin only thickened; anterior and posterior edge of pronotal fovea covered with bristle of short golden setae except at their lower extent (fig. 18b); Pronotal dorsal punctures circular, generally larger than those on head, intervening spaces moderately glossy, punctures gradually increasing in size towards dorsal of constriction area; constriction area dorsally with dense, large punctures, intervening spaces much smaller than puncture diameters; lateral margins of pronotum minutely punctured; pronotal setae yellowish, dense, subdecumbent to decumbent; tactile setae inconspicuous.

Scutellar shield minute, slightly pointed apically.

Elytra dorsally elongate elliptical, broader than head and pronotum, moderately convex in dorsal aspect, slightly widened laterally around midlength and broadly rounded at lateral margins; humeral angle strongly rounded (metathoracic wings fully developed); punctures circular, much stronger and larger than those on dorsal forebody, smaller and less coarse than dorsal punctures on pronotal constriction; intervening spaces moderately glossy, 1.3– 1.8 times of diameter of punctures on basal half of elytron; punctures becoming smaller and shallower on posterior third of elytra; setae brownish, 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 23 and 24.

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

Diagnosis. All antennomeres in this species not distinctly transverse.The metathoracic wings are well-developed, with a significantly large body length, distinct humeral angles, and broad elytra, allowing for easy distinction from other species from China. The aforementioned antennal features are also found in species from the Philippines, such as M. hamiguitan Telnov, 2023 and M. maranao Telnov, 2023 , they can be distinguished from each other by their distinctly different pronotal and body morphology.

Etymology. Patronymic. This species named after the collector Rixin Jiang (Guizhou University, Guiyang, China).

Distribution. China (Hainan).

Figures

FIGURES 17–24. Macrotomoderus jiangrixini sp. nov., holotype. (17) habitus of male; (18) Pronotum, (a) dosal view, (b) lateral view; (19) sternite VII, ventral view; (20) tergite VII, dorsal view; (21) sternite VIII, ventral view; (22) tergite VIII, dorsal view; (23) spiculum; (24) aedeagus, (a) ventral view, (b) lateral view. Scale bar: 1 mm for fig. 17; 0.5 mm for figs. 19–24.

FIGURES 25–27. Macrotomoderus jiangrixini sp. nov., paratype, female. (25) sternite VII, ventral view; (26) tergite VII, dorsal view; (27) spermatheca. Scale bar: 0.2 mm.