Macrotomoderus lapidarius, 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 : 49-52

Macrotomoderus lapidarius sp. nov.

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Figs 28–29

Differential diagnosis

This species readily differs from all congeners due to the specifically modified head base and the anterior margin of pronotum (see details below) in the combination with the comparatively broad, robust pronotum and the specific shape of the male genitalia. The structure of the anterior margin of the pronotum similar as in M. truncatulus sp. nov. (see description below), consider diagnosis of this species.

Etymology

Since the city of Yujiacun near the type locality of this new species is widely known in China for its ancient stone houses, stone streets, wells and stone terraced fields, the new species is named from the Latin ‘lapidarius’ (‘the practice of shaping stone and minerals, or gemstones into decorative items’).

Type material

Holotype CHINA • ♂; “CHINA, Sichuan, W Ningnan, 1.1 km SSW Yujiacun, 2830 m, 27°04′38″N 102°36′15″E, 1.vii.2018 Belousov & Kabak lg.”; ZIN.

Description

MEASUREMENTS. Holotype, total body length 4.08 mm; head 0.83 mm long, across eyes 0.75 mm broad, pronotum 1 mm long, maximum width 0.8 mm, minimum width 0.45 mm, elytra 2.25 mm long, 1.55 mm combined wide.

Forebody dorsally and ventrally brown, elytra dark brown. 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. Head base with conspicuous, short and broad, posteriad-pointed median triangular projection that is provided with a group of dense, thick, yellowish setae on both sides of this projection ( Fig. 28B–C ). Head dorsal punctures minute and inconspicuous. Head dorsal setae inconspicuous, sparse. Antennae extending slightly over base of pronotum. Antennomere three nearly same long as antennomere two, antennomeres 9–10 transverse. Terminal antennomere shortly triangular with rounded apex,1.2–1.3 ×as long as penultimate antennomere. Terminal maxillary palpomere securiform. Pronotum shortly cylindrical with very broad and medially shortly notched postmedian lateral constriction. Front margin of anterior lobe broadly rounded, in male deeply and broadly impressed mesally opposite median part of head base; anterolateral margins of this impression are moderately strongly raised in dorsal aspect, acutely denticulate ( Fig. 28B ). Anterior edge of pronotum in front of anterior impression in male forms thin and short median wall, at upper margin with a row of golden, long, in part curved and anteriad-pointing setae ( Fig. 28B–C ). Pronotum dorsally without anterior rim. Anterior and posterior lobe slightly convex in lateral view ( Fig. 28C ). Lateral constriction slightly continues onto disc in lateral view, broad and shallow ( Fig. 28C ). Lateral pronotal fovea broad at lower external margin of pronotum, slightly widens upwards towards pronotal disc in lateral view, external margins protruding into a pair of obtuse (in lateral view), moderately widely separated denticles (in lateral view). Cavity in lateral wall of pronotum between lateral denticles moderately large, elliptical. In dorsal view, lateral pronotal fovea moderately broad, anterior and posterior pair of denticles appear obtusely angulate, glabrous ( Fig. 28B ). Pronotal punctures minute on disc; lateral constriction dorsally with very dense, irregularly shaped and variably sized punctures, few largest of which positioned medially in constriction. Dorsal pronotal setae rather long, appressed, at least in part concealing surface of posterior pronotal lobe. Scutellar shield small, apically rounded. Elytra dorsally elongate elliptical, slightly convex in lateral view, widened laterally around midlength, shoulders obsolete (apterous species). Elytral punctures moderately large, very sparse, becoming smaller and sparser towards apices. Elytral setae long and sparse, suberect. Male tergite and morphological sternite VII broadly rounded at posterior margin. Aedeagus as in Fig. 29 , large and elongate, basale strongly hook-shaped in lateral view. Gonopore armature arranged into one ‘garland’, constituting pieces elongate-papillate in basal portion of armature, becoming very dense, spine-like, closely attached to one another in apical portion of aedeagus.

Sexual dimorphism

Female is unknown.

Ecology

Collected at 2830 m elevation.

Distribution

Known only from southern part of Sichuan Province, SW China.

Figures

Fig. 28. Macrotomoderus lapidarius sp. nov., holotype, ♂ (ZIN). A. Habitus, dorsal view. B. Forebody, dorsal view. C. Ditto, lateral view. Scale bar: A = 1 mm; B–C = not to scale.

Fig. 29. Macrotomoderus lapidarius sp. nov., holotype, ♂ (ZIN), aedeagus. A–B. General view, different positions. C. Gonopore armature, median portion of apicale. D. Ditto, apical portion of basale. E. Apical portion. F. Ditto, different position. Not to scale.