Macrotomoderus bordonii, 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 : 16-19

Macrotomoderus bordonii sp. nov.

urn:lsid:zoobank.org:act:AB3A3E8C-1CEA-4C77-A8AF-BF99B6A42383

Figs 8–9

Differential diagnosis

This species appears similar to Indo-Chinese congeners with anteriorly excavate and medially longitudinally carinate pronotum, like Macrotomoderus humerifer (Uhmann, 1994) (N Vietnam), M. perforatus Telnov, 2019 ( China: Yunnan), M. transitans sp. nov. ( China: Yunnan) (see description below), and M. yunnanus ( Telnov, 1998) ( China: Yunnan). The new species has the obsolete humeri (the humeri angulate in M. humerifer , this species is macropterous) and the aedeagus is significantly slenderer than that of M. perforatus and M. transitans sp. nov. (not conspicuously bulb-shaped widened in basal half) and is significantly shorter than the slender aedeagus of M. yunnanus .

Etymology

Patronymic. Named in honour of Arnaldo Bordoni (Florence, Italy), an outstanding staphylinid beetles specialist and my good friend.

Type material

Holotype CHINA • ♂; “CHINA, YUNNAN Prov. 5.9 km W Tongbiguan, 24°36.78′N, 97°35.48′E, J. Hájek & J. J. Růžička leg. // (Ch12) 25.vi. 2016; 1290 m, sift #08, secondary broad-leaved forest, valley near stream ”; NMP.

Description

MEASUREMENTS. Holotype, total body length 3.5 mm; head 0.7 mm long, across eyes 0.7 mm broad, pronotum 0.8 mm long, maximum width 0.6 mm, minimum width 0.3 mm, elytra 2 mm long, 1.25 mm combined wide.

Dorsum and venter uniformly brown, pronotum dark reddish brown. Mouthparts, antennae, palps and legs yellowish-brown. Head subtriangular with moderately large, ovoid compound eyes, which are protruding beyond head outline laterally. Tempora slightly converging towards head base, as long as dorsal eye length. Temporal angles broadly rounded. Head base subtruncate. Head dorsal punctures minute and sparse. Intervening spaces glossy and glabrous, much wider than punctures. Head dorsal setae long, sparse. Antennae extending towards base of pronotum. Antennomere slightly longer than antennomere two, antennomeres 4–6 shortened and thickened, ovoid, antennomeres 7–10 transverse, of them 8–10 strongly transverse. Terminal antennomere broadly triangular with rounded apex, twice as long as penultimate antennomere. Terminal maxillary palpomere securiform. Pronotum with short, medially deeply and broadly notched postmedian lateral constriction. Front margin of anterior lobe very broadly rounded (subtruncate), in male moderately deeply and broadly impressed mesally opposite median part of head base; anterolateral margins of this impression raised in dorsal aspect, produced into subacute denticles ( Fig. 8B–C ). Anterior edge of pronotum in male in front of anterior impression with thin, rather low median wall that is provided with several stout, in part anteriad-pointed, erect setae ( Fig. 8C ). Pronotum dorsally without anterior rim. Anterior and posterior lobe convex in lateral view ( Fig. 8C ). Lateral constriction continues onto disc in lateral view, shallow ( Fig. 8C ). 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 (in lateral view), moderately widely separated denticles (in lateral view). Both denticles dorsolaterally with a brush of dense, short, golden setae. In dorsal view, lateral pronotal fovea deep and broad, anterior and posterior pair of denticles appear obtusely angulate, each with a brush of short, dense setae ( Fig. 8B ). Anterior lobe and lateral constriction dorsally medially longitudinally carinate. Pronotal punctures minute on disc; lateral constriction dorsally dense and coarse, irregularly punctured. Dorsal pronotal setae as those on head. Scutellar shield very small, apically pointed. Elytra dorsally elongate elliptical, flattened in lateral view, slightly widened laterally around midlength and broadly rounded at lateral margins, shoulders obsolete (apterous species). Elytral punctures moderately large and deep, moderately dense on basal half of elytra, becoming smaller and shallower towards apices. Intervening spaces on basal half of elytra about as large as punctures. Elytral setae long and rather dense, suberect. Male tergite and morphological sternite VII broadly rounded at posterior margin. Aedeagus as in Fig. 9 , elongate, narrow and slender, rounded apically, apicale with delicate, long and spine-shaped gonopore armature that is arranged into ‘garland’ with multiple (3–4) rows. Armature spines becoming smaller and more delicate at apex of aedeagus.

Sexual dimorphism

Female is unknown.

Ecology

Collected from leaf litter in a secondary broad-leaved forest at 1290 m elevation.

Distribution

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

Figures

Fig. 8. Macrotomoderus bordonii sp. nov., holotype, ♂ (NMP). A. Habitus, dorsal view. B. Forebody, dorsal view. C. Ditto, lateral view. Scale bar: A = 1 mm; B–C = not to scale.

Fig. 9. Macrotomoderus bordonii sp. nov., holotype, ♂ (NMP), aedeagus. A–B. General view, different positions. C. Gonopore armature in apical and median portions of aedeagus. D. Ditto, basal portion of apicale. E. Apical portion. Not to scale.