Macrotomoderus tenuis, 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 : 63-66

Macrotomoderus tenuis sp. nov.

urn:lsid:zoobank.org:act:1FBCCE43-12EC-4B87-B137-019143D05164

Figs 36–37

Differential diagnosis

This species falls in a informative group of species from continental China with lateral foveae of pronotum not or only poorly visible in dorsal view, not forming deep notches. Among these species, pronotum is medially longitudinally carinate at constriction area in M. bukejsi Telnov, 2018 and M. chingpo Telnov, 2018 but not carinate in M. tenuis sp. nov. Pronotum is peculiarly modified in M. gracilis Telnov, 2018 , with anterior margin somewhat elevated and strongly projecting anteriad, provided with a group of ך-shaped (bent) anteriad-pointed setae; these modifications are not observed in M. tenuis sp. nov. Also see above diagnosis of M. angelinii sp. nov.

Etymology

Named from the Latin ‘tenuis’ (‘slender’) to referring to the slender, elongate pronotum of this species.

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 3.05 mm; head 0.65 mm long, across eyes 0.55 mm broad, pronotum 0.7 mm long, maximum width 0.5 mm, minimum width 0.2 mm, elytra 1.7 mm long, 1.5 mm combined wide.

Dorsum and venter pale brown, head slightly darker. Mouthparts, antennae, palps and legs yellow. Head ovoid with moderately large, ovoid compound eyes, which are slightly protruding beyond head outline laterally. Head rounded in broad arc posterior to eyes. Head dorsal punctures minute and inconspicuous. Head dorsal setae inconspicuous, sparse. Antennae extending towards base of pronotum. Antennomere three 1.1–1.2 × as long as antennomere two, antennomeres 9–10 transverse. Terminal antennomere asymmetrically triangular with pointed apex, twice as long as penultimate antennomere. Terminal maxillary palpomere securiform. Pronotum elongate, with broad lateral constriction. Front margin of anterior lobe broadly rounded, in male medially with a bunch of golden, moderately long and dense, anteriad-pointed to apically C-like curved setae ( Fig. 36B–C ). Pronotum dorsally with narrow anterior rim. Anterior and posterior lobe convex in lateral view ( Fig. 36C ). Lateral constriction continues onto disc in lateral view, moderately deep ( Fig. 36C ). Lateral pronotal fovea moderately broad at lower external margin of pronotum, strongly 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, rectangular. In dorsal view, lateral pronotal fovea short and narrow, denticles small in dorsal view ( Fig. 36B ). Pronotal punctures minute on disc; lateral constriction dorsally with dense, irregularly sized, generally circular punctures. Dorsal pronotal setae rather long, appressed, at least in part concealing disc of posterior pronotal lobe. Scutellar shield small, apically rounded. Elytra dorsally elliptical, convex in lateral view, broadly rounded laterally, shoulders obsolete (apterous species). Elytral punctures rather small, moderately dense, 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. 37 , elongate, rather narrow, with extremely delicate, poorly visible gonopore armature.

Sexual dimorphism

Female is unknown.

Ecology

Collected at 2830 m elevation.

Distribution

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

Figures

Fig. 36. Macrotomoderus tenuis 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. 37. Macrotomoderus tenuis sp. nov., holotype, ♂ (ZIN), aedeagus. A–B. General view, different positions. C. Gonopore armature, apical portion of apicale. D. Ditto, median portion of apicale. Not to scale.