Macrotomoderus belousovi, Telnov, 2022

Telnov, Dmitry, 2022, Revision of the Tomoderinae (Coleoptera: Anthicidae). Part III. New species and records of Macrotomoderus Pic, 1901 from China and a key to the Palaearctic species, European Journal of Taxonomy 797, pp. 1-100 : 7-9

Macrotomoderus belousovi sp. nov.

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Fig. 3

Differential diagnosis

Most similar to Macrotomoderus kabaki sp. nov. (described below), differs primarily in the less strongly transverse antennomeres 9–10 (the antennomeres 8–10 strongly transverse in M. kabaki sp. nov.), the convex lateral outline of the anterior pronotal lobe (flattened in M. kabaki sp. nov.), the clypeus broadly emarginate anterodorsally (truncate in M. kabaki sp. nov.), and the comparatively longer, apically rounded elytra (the elytra comparatively shorter and subtruncate in M. kabaki sp. nov.). Also see key to species below.

Etymology

Patronymic. Named in honour of one of the first collectors, Igor’ A. Belousov (All-Russian Institute of Plant Protection, St Petersburg, Russia).

Type material

Holotype CHINA • ♂ (abdomen and aedeagus lost during dissection); “CHINA, W Yunnan, SSW Liuku, 25°41′34″N 98°47′29″E 2950 m, traps, 22.v.2006 Belousov & Kabak ”; ZIN.

Description

MEASUREMENTS. Holotype, total body length 4.4 mm; head 0.8 mm long, across eyes 0.88 mm broad, pronotum 1.2 mm long, maximum width 0.85 mm, minimum width 0.35 mm, elytra 2.4 mm long, 1.5 mm combined wide.

Dorsum and venter uniformly brown, pronotum inconspicuously paler. Mouthparts, antennae, palps and legs yellowish-brown. Head ovoid with moderately large, ovoid compound eyes, which are not protruding beyond head outline laterally. Head rounded in broad arc posterior to eyes. Clypeus broadly emarginate anterodorsally. Head dorsal punctures minute and inconspicuous. Head dorsal setae inconspicuous, sparse. Antennae extending towards base of pronotum. Antennomere three about 1.25× as long as antennomere two, antennomeres 9–10 semispherical, transverse ( Fig. 3D ). Terminal antennomere triangular with pointed apex, nearly twice as long as penultimate antennomere. Terminal maxillary palpomere slightly securiform. Pronotum with broad and medially deeply notched postmedian lateral constriction. Front margin of anterior lobe very broadly rounded, dorsally without anterior rim. Anterior lobe slightly convex in lateral view ( Fig. 3C ). Lateral constriction continues onto disc in lateral view, shallow ( Fig. 3C ). Lateral pronotal fovea moderately rather narrow at lower external margin of pronotum, not or almost not widens upwards towards pronotal disc in lateral view, external margins protruding into a pair of obtuse, long setose and narrowly separated denticles (in lateral view). Cavity in lateral wall of pronotum between lateral denticles moderately broad, elliptical. In dorsal view, lateral pronotal fovea broad, anterior and posterior pair of denticles appear obtusely angulate, glabrous, partially concealed dorsally by setae from adjoining portion of lateral constriction ( Fig. 3B ). Pronotal punctures minute on disc; lateral constriction in anterior part dorsally with acute, short, median longitudinal carina (only visible by sufficient light!) that is projecting nearly to midlength of anterior lobe of pronotum, and densely, coarsely, irregularly shaped punctured. Dorsal pronotal setae inconspicuous, moderately long. Scutellar shield minute, triangular. Elytra dorsally elongate elliptical, flattened in lateral view, slightly widened laterally prior to middle, shoulders obsolete (apterous species). Elytral apices rounded. Elytral punctures small but rather dense, not becoming conspicuously smaller or sparser towards apices. Elytral setae long and sparse, suberect. Male tergite and morphological sternite VII broadly rounded at posterior margin. Aedeagus lost during dissection.

Sexual dimorphism

Female is unknown.

Ecology

Collected in pitfall traps at 2950 m elevation.

Distribution

Known only from the western part of Yunnan Province, SW China.

Figures

Fig. 3. Macrotomoderus belousovi sp. nov., holotype, ♂ (ZIN). A. Habitus, dorsal view. B. Forebody, dorsal view. C. Ditto, lateral view. D. Antennomeres 8-11 of the left antenna. Scale bar: A = 1 mm; B–D = not to scale.