Macrotomoderus angelinii, 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 : 3-4

Macrotomoderus angelinii sp. nov.

urn:lsid:zoobank.org:act:8E264897-1526-4DB8-A6CA-BF9888A270EA

Figs 1–2

Differential diagnosis

This species falls in a group of species from continental China with the lateral fovea of pronotum not or only poorly visible in dorsal view, not forming deep notches at both sides of the lateral constriction. Among these species, Macrotomoderus bukejsi Telnov, 2018 , M. chingpo Telnov, 2018 , and M. gracilis Telnov, 2018 have slender and elongate pronotum. The pronotum is medially longitudinally carinate at the constriction area in the two first species, non-carinate in M. angelinii sp. nov. The pronotum is peculiarly modified in M. gracilis , with the median part of the anterior margin of it elevated and strongly projecting anteriad, provided with a group of ך-shaped (bent) setae directed anteriad (both modifications are not present in M. angelinii sp. nov.). Macrotomoderus tenuis sp. nov. (see description below) has the lateral foveae of the pronotum short and narrow, but well-visible in dorsal view (this includes denticles of the fovea), the median setae on the anterior margin of the male pronotum either straight and anteriadpointed or slightly C-shaped (curved) in their apical portion.

Etymology

Patronymic. This species named after the famous Italian coleopterist and my good colleague Fernando Angelini who has passed away on 28 May 2021 aged 72.

Type material

Holotype CHINA • ♂; “CHINA, Yunnan, 11.3 km W Laiping, SE Lajing, 3.4km SSE Jiaolieshan, 3405 m, 20.v.2018, I. Belousov & I. Kabak leg. // 26°26′50″N 99°18′19″E ”; ZIN.

Paratypes (2 specimens) CHINA • 1 ♀; same labels as for holotype; ZIN • 1 ♂; same labels as for holotype; DTC .

Description

MEASUREMENTS. Holotype, total body length 3.48 mm; head 0.88 mm long, across eyes 0.6 mm broad, pronotum 0.8 mm long, maximum width 0.5 mm, minimum width 0.2 mm, elytra 1.8 mm long, 1.2 mm combined wide.

Dorsum and venter uniformly pale brown. Mouthparts, antennae, palps and legs yellow. 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 dorsal punctures minute and inconspicuous. Head dorsal setae inconspicuous, sparse. Antennae nearly extending towards base of pronotum. Antennomere three about as long as antennomere two, antennomeres 8–10 transverse, of which penultimate antennomere strongly transverse. Terminal antennomere asymmetrically triangular with rounded apex, nearly twice as long as penultimate antennomere. Terminal maxillary palpomere slightly securiform. Pronotum elongate and slender, with broad, medially slightly notched (in dorsal view) postmedian lateral constriction. Front margin of anterior lobe very broadly rounded, dorsally without anterior rim, medially with a bunch of yellowish, moderately long, Ɔ-shaped (curved), posterodorsad-pointed setae ( Fig. 1B–C ). Anterior lobe slightly convex in lateral view ( Fig. 1C ). Lateral constriction continues onto disc in lateral view, shallow ( Fig. 1C ). Lateral pronotal fovea narrow at lower external margin of pronotum, strongly widens upwards towards pronotal disc in lateral view, external margins protruding into a pair of inconspicuous, obtuse (in lateral view), glabrous, narrowly separated denticles (in lateral view). Cavity in lateral wall of pronotum between lateral denticles small, narrowly rectangular. In dorsal view, lateral pronotal fovea narrow, anterior and posterior pair of denticles poorly visible, glabrous ( Fig. 1B ). Pronotal punctures minute on disc; lateral constriction dorsally with dense, moderately large to large circular punctures separated by about their diameters. Dorsal pronotal setae inconspicuous, moderately long. Scutellar shield minute, triangular. Elytra dorsally elliptical, convex in lateral view, strongly widened laterally around midlength, lateral margins evenly broadly rounded, shoulders obsolete (apterous species). Elytral punctures much stronger and larger than those on dorsal forebody but somewhat less coarse than dorsal punctures on lateral pronotal constriction. Elytral setae long and sparse, suberect. Male and female tergite and morphological sternite VII broadly rounded at posterior margin. Aedeagus as in Fig. 2 , rather narrow and slender, with very delicate, tube-like encapsulated gonopore armature.

Sexual dimorphism

Female anterior margin of pronotum without modifications.

Ecology

Collected at 3405 m elevation.

Distribution

Known only from northern part of Yunnan Province, SW China.

Figures

Fig. 1. Macrotomoderus angelinii 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. 2. Macrotomoderus angelinii sp. nov., holotype, ♂ (ZIN), aedeagus. A–B. General view, different positions. C. Gonopore armature in median portion of aedeagus. D. Ditto, basal portion of apicale. E. Apical portion. Not to scale.