Macrotomoderus bicrispus, 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 : 9-12

Macrotomoderus bicrispus sp. nov.

urn:lsid:zoobank.org:act:0746DE3F-1EAB-483C-AC83-7EE4D3505DBA

Figs 4–5

Differential diagnosis

This species readily differs from all congeners primarily due to the presence of the paired bunches of the curl-like golden setae on the median part of the anterior margin of pronotum and in the peculiar shape of the anterior pronotal projection. Most similar to Macrotomoderus chingpo Telnov, 2018 ( China: Yunnan) that also possesses somewhat similar, Ɔ-like curved median setae at anterior margin of pronotum. However, head is comparatively wider in M. bicrispus sp. nov., the shape of the aedeagus is different, the lateral constriction of the pronotum is broader and deeper (in dorsal view), and the elytra are comparatively slenderer, more elongate in the new species.

Etymology

Named from the Latin ‘bi’ (‘two’) + ‘crispum’ (‘curled’) to point on paired bunches of curl-like setae on anterior margin of pronotum.

Type material

Holotype CHINA • ♂; “CHINA, Yunnan, SW of Guoditang, 6.4 km ENE of Weixi City 27°12′38″N 99°21′22″E, 3225 m, 29.v.2016 Kabak & Davidian leg.”; ZIN.

Description

MEASUREMENTS. Holotype, total body length 4.6 mm; head 0.95 mm long, across eyes 0.95 mm broad, pronotum 1.25 mm long, maximum width 0.95 mm, minimum width 0.35 mm, elytra 2.4 mm long, 1.7 mm combined wide.

Dorsum and venter uniformly brown. Mouthparts, antennae, palps and legs yellowish-brown. Head ovoid with moderately large, ovoid compound eyes, which laterally are slightly protruding beyond head outline. Head rounded in broad arc posterior to eyes, head base shortly subtruncate medially. Occiput slightly declivous posterodorsally. Head dorsal punctures minute and inconspicuous. Head dorsal setae inconspicuous, sparse. Antennae extending towards base of pronotum. Antennomere three about 1.2× as long as antennomere two, antennomeres 7–10 transverse, of them 9–10 strongly transverse. Terminal antennomere triangular with rounded apex, 2–2.2 × as long as penultimate antennomere. Terminal maxillary palpomere securiform. Pronotum broadly hourglass-shaped with anterior lobe strongly wider than posterior, about same width as head across eyes. Postmedian lateral constriction broad and medially deeply notched. Front margin of anterior lobe very broadly rounded, near subtruncate, dorsally without anterior rim. Front margin of anterior lobe with two shallow impressions and very median part of front margin slightly projecting anteriad between these two impressions; this projection on both sides of its base is provided with a paired bunch of golden, long and strongly Ɔ-like curved setae touching neck and head base ( Fig. 4B–C ). Each of two bunches raises from one large pore. Anterior lobe convex in lateral view ( Fig. 4C ). Lateral constriction continues onto disc in lateral view, shallow ( Fig. 4C ). Lateral pronotal fovea moderately broad at lower external margin of pronotum, widens upwards towards pronotal disc in lateral view, external margins protruding into a pair of obtuse, short setose, moderately widely separated denticles (in lateral view). In lateral view anterior denticle is strongly obtuse, with few golden setae at base, posterior – subacute, glabrous. Cavity in lateral wall of pronotum between lateral denticles is large. In dorsal view, lateral pronotal fovea narrow, anterior and posterior pair of denticles appear obtusely angulate, glabrous ( Fig. 4B ). Posterior portion of pronotal fovea long and dense setose in dorsal view ( Fig. 4B ). Pronotal punctures minute on disc; lateral constriction dorsally with dense, irregularly shaped punctures, largest of which positioned longitudinally along midline. Dorsal pronotal setae inconspicuous, moderately long except dense and long setose area beyond to posterior pair of denticles. Scutellar shield minute, triangular. Elytra dorsally elongate elliptical, flattened in lateral view, widened laterally around midlength, lateral margins evenly broadly rounded, 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. 5 , robust and large, most of apicale and median portion of basale filled with conspicuous, large and dense, irregularly shaped spine-like gonopore armature.

Sexual dimorphism

Female is unknown.

Ecology

Collected at 3225 m elevation.

Distribution

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

Figures

Fig. 4. Macrotomoderus bicrispus 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. 5. Macrotomoderus bicrispus 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. Ditto, apical portion, different position. Not to scale.