Euconnus (s. str.) baoshanus, Jałoszyński, 2024

Jałoszyński, Paweł, 2024, Four new species of the Euconnus taiwanus group from China (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 5536 (1), pp. 178-184 : 179-180

Euconnus (s. str.) baoshanus sp. nov.

( Figs 1 , 5–8 )

Type material studied. Holotype ( CHINA: Yunnan): ♂, two labels: “CHINA: Yunnan, Baoshan Pref., Gao- / ligong Shan, 65 km NNE Tengchong / 1750 m, 25°35’20’’N, 98°40’21’’E, / sec. mixed forest, overgrown stone / debris, litter and moss sifted, 31.VIII. / 2009, leg. M. Schülke [ CH09-10b ]” [white, printed], “ EUCONNUS (s str.) / baoshanus m. / P. Jałoszyński 2024 / HOLOTYPUS” [red, printed] ( MNB).

Diagnosis. Antennal club trimerous with antennomere 9 distinctly narrower than 10; males lacking secondary sexual characters; aedeagus with bifurcate apex, its lateral portions subtriangular and median region truncate, with shallow median emargination.

Description. Body of male ( Fig. 1 ) elongate, strongly convex; pigmentation dark brown, elytra slightly lighter than head and pronotum, tarsi and maxillary palps clearly lighter than elytra; body covered with light brown setae; BL 1.25 mm.

Head much narrower than pronotum, broadest across eyes, HL 0.25 mm, HW 0.23 mm; tempora in dorsal view nearly 4 times as long as eyes, behind eyes strongly and evenly converging posteriorly, posterior margin of vertex narrowly rounded and distinctly bulging posterodorsally. Eyes moderately large and weakly convex, in lateral view weakly oval. Frons and vertex with unremarkable, fine punctures, glossy; setae sparse, short and suberect, tempora and posterior margin of vertex covered with dense thick bristles. Antennae short and compact, AnL 0.45 mm, scape and pedicel each distinctly elongate, antennomeres 3‒8 each weakly transverse, 9 and 10 each strongly transverse, 11 indistinctly longer than 9 and 10 combined, indistinctly elongate.

Pronotum broadest between middle and posterior third; PL 0.30 mm, PW 0.28 mm. Pronotal base with inner pair of large, circular pits and with outer pair of much smaller pits. Punctures and setae on pronotal disc similar to those on frons and vertex; sides of pronotum with dense thick bristles.

Elytra together oval, broadest slightly anterior to middle; EL 0.70 mm, EW 0.48 mm, EI 1.47; humeral calli small, elongate, each mesally demarcated by short elongate impression; elytral apices separately rounded. Punctures indistinct, superficial and unremarkable; setae sparse and suberect.

Hind wings long and functional.

Legs slender, unmodified, all tibiae slightly curved inwards.

Aedeagus ( Figs 5–8 ) elongate, AeL 0.30 mm; median lobe in ventral view broadest in sub-basal region, with lateral margins distinctly concave in subapical third, apex bifurcate, with widely separated subtriangular lateral lobes, apical margin between them trisinuate; endophallus symmetrical, with darkly sclerotized median structure flanked by curved elongate sclerites. Parameres slender, not reaching apex of median lobe, each with three long apical setae.

Female. Unknown.

Distribution. S China (Yunnan Province).

Etymology. The adjective baoshanus refers to Baoshan, a prefecture-level city in western Yunnan.

Remarks. Among the previously treated species of the taiwanus group, only the Okinawan E. banana has the aedeagus of a similar general shape as that of E. baoshanus . These species share broadly separated and subtriangular lateral processes of the aedeagal apex. However, in E. banana , the median region between lateral processes forms a plate projecting distally far beyond apices of the lateral processes, whereas in E. baoshanus the median region of the aedeagus between the processes is truncate and concave at middle. Moreover, males of E. baoshanus have unmodified tarsi, vs. conspicuously modified mesotarsi in E. banana , having a strongly curved tarsomere 5.

Figures

FIGURES 1‒4. Dorsal habitus of holotype males. Euconnus baoshanus sp. nov. (1), E. pseudobaoshanus sp. nov. (2), E. tianmushanus sp. nov. (3), and E. pingbianensis sp. nov. (4).

FIGURES 5‒12. Aedeagus in ventral (5, 7, 9, 11) and lateral (6, 8, 10, 12) views. Euconnus baoshanus sp. nov. (5‒8), and E. pseudobaoshanus sp. nov. (9‒12).