Macrotomoderus femoridens, 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 : 26-29

Macrotomoderus femoridens sp. nov.

urn:lsid:zoobank.org:act:5042B54D-6150-40D4-BA04-44A170958275

Figs 14–15

Differential diagnosis

Readily different from all congeners due to the strongly dentate male metafemora, the comparatively small body and the dorsally non-carinate and non-sulcate pronotum.

Etymology

From the Latin ‘femur’ + ‘dens’, to point on the strongly dentate male metafemora.

Type material

Holotype CHINA • ♂; “CHINA, Guangdong prov. Nanling National Nature Reserve Dadongshan NP , 21.iv.2013 24°54.62′N, 112°43.11′E, 770 m, J. Hájek & J. Růžička leg. // Sift #19 bamboo forest on right slope of valley above small dam, close to former field station, sifting of leaves in deeper, wet depressions and close to large stones ”; NMP.

Description

MEASUREMENTS. Holotype, total body length 2.75 mm; head 0.65 mm long, across eyes 0.55 mm broad, pronotum 0.7 mm long, maximum width 0.52 mm, minimum width 0.22 mm, elytra 1.4 mm long, 1.1 mm combined wide.

Dorsum and venter uniformly pale brown, pronotum inconspicuously paler. 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 extending or nearly extending towards base of pronotum. Antennomere three nearly as long as antennomere two, antennomeres 8–10 transverse, of them 9–10 strongly transverse. Terminal antennomere broadly triangular with rounded apex, one third longer than penultimate antennomere. Terminal maxillary palpomere slightly securiform, nearly triangular. Pronotum with broad and medially deeply notched postmedian lateral constriction. Front margin of anterior lobe broadly rounded, dorsally without anterior rim. Anterior lobe convex in lateral view ( Fig. 14C ). Lateral constriction continues onto disc in lateral view, shallow ( Fig. 14C ). Lateral pronotal fovea rather moderately broad at lower external margin of pronotum, slightly widens upwards towards pronotal disc in lateral view, external margins protruding into pair of obtuse (in lateral view), moderately widely separated denticles (in lateral view). Cavity in lateral wall of pronotum between lateral denticles large. In dorsal view lateral pronotal fovea broad and deep, anterior and posterior pair of denticles appear right-angled or slightly obtuse, glabrous ( Fig. 14B ). Posterior pair of denticles dorsally with a brush of dense, moderately long, golden setae. Pronotal punctures minute on disc; lateral constriction dorsally with irregular, large and dense punctures. 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, becoming much smaller and sparser on posterior third of elytra. Elytral setae long and sparse, suberect. Metafemora (only in males?) on posterior margin with large, subacutely pointed median tooth that is slightly arched at its anterior but nearly straight at posterior margin ( Fig. 14A, D ). Male tergite VII broadly rounded at posterior margin. Male morphological sternite VII medially emarginate at posterior margin. Aedeagus as in Fig. 15 , short and robust, with large, bubble-like basale and peculiar gonopore armature. Basale with double gonopore armature consisting of small to very large, pebble-like constituting pieces (grouped by size classes). Apicale with ‘garland’ of elongate, large spines closely attached to one another, becoming distinctly less elongate and more obtuse at apex of aedeagus.

Sexual dimorphism

Female is unknown.

Ecology

Collected at 770 m elevation in bamboo forest.

Distribution

Known only from Dadongshan Mountain in Guangdong Province, SW China.

Figures

Fig. 14. Macrotomoderus femoridens sp. nov., holotype, ♂ (NMP). A. Habitus, dorsal view.B. Forebody, dorsal view. C. Ditto, lateral view. D. Right posterior leg. Scale bar: A = 1 mm; B–D = not to scale.

Fig. 15. Macrotomoderus femoridens sp. nov., holotype, ♂ (NMP), aedeagus. A–B. General view, different positions. C. Gonopore armature in median portion of aedeagus. D. Ditto, basale and basal portion of apicale. E. Median portion, different position. Not to scale.