Mannerheimia maculata Shavrin, 2018

Shavrin, Alexey V., 2018, Four new species of the genus Mannerheimia Mäklin, 1880 (Coleoptera: Staphylinidae: Omaliinae) from south-western China and Taiwan, Zootaxa 4407 (4), pp. 521-532 : 527-528

Mannerheimia maculata Shavrin , sp.n.

( Figs. 3 , 9 , 12–13 )

Type material examined: Holotype ♂ [specimen dissected]: ‘ CHINA, Yunnan, 15km | W Deqin, Mingyong, | N28°27'43'' E98°46'53'', | 8.vi.2012, 2546m, | sift18, V. Grebennikov’ <rectangular label, printed>, ‘ HOLOTYPE | Mannerheimia | maculata sp.n. | Shavrin A.V. des. 2017’ <red rectangular label, printed> ( NSMT).

Paratypes (6 specimens): 2 ♂, 2 ♀ [both specimens without right antennomeres 3–11]: same label as the holotype (1 ♂, 1 ♀: CS; 1 ♂, 1 ♀: NSMT); 1 ♂: ‘CHINA, Yunnan, 15km | W Deqin, Mingyong, | N28°27'29'' E98°45'28'', | 7.vi.2012, 3289m, | sift16, V. Grebennikov’ <rectangular label, printed> (CNC); 1 ♂ [specimen (without right elytron) dissected]: ‘CHINA, Yunnan, 15km | W Deqin, Mingyong, | N28°27'39'' E98°46'19'', | 8.vi.2012, 2735m, | sift17, V. Grebennikov’ <rectangular label, printed> (NSMT). All paratypes with additional red rectangular printed label: ‘PARATYPE | Mannerheimia | maculata sp.n. | Shavrin A.V. des. 2017’.

Description. Measurements (n=7): HW: 0.48–0.51; HL: 0.26–0.28; AL (holotype): 0.61; OL: 0.13; PL: 0.37–0.38; PW: 0.70–0.75; EL: 0.76; EW: 0.94–1.07; AW: 0.89–1.05; MTbL (holotype): 0.41; MTrL (holotype): 0.24 (MTrL 1–4: 0.15; MTrL 5: 0.09); AedL: 0.37; TL: 2.22–2.57 (holotype: 2.25).

Body moderately elongate, convex. Yellow-brown to reddish-brown, head and abdomen (except paratergites) brown in some; antennomeres 6–11 yellow brown; mouthparts, antennomeres 1–5, sometimes lateral and basal margins of pronotum, latero-basal and apical portions of elytra, legs, paratergites and apical abdominal tergites yellow. Body shiny, without microsculpture except postocular portions of head and neck with very fine and indistinct transverse microsculpture and abdominal tergites with distinct isodiametric microscuilpture. Head with irregular, moderately dense and deep punctation, distinctly larger and deeper on posterolateral portions of head and between ocelli, sometimes with impunctate transverse portion in middle at level of posterior third of eyes; punctation of pronotum as that of head, but very dense and more or less regular, with small impunctate portion in medio-basal third; scutellum with several very small punctures; punctation of elytra as that of pronotum, each elytron with six to seven tangled and vague longitudinal rows of punctures, remaining elytral punctures forming indistinct and tangled diagonal rows and becoming irregularly scattered laterally; abdominal tergites with very indistinct and sparse, small punctation. Habitus as in Fig. 3 .

Head 1.8 times as wide as long, without occipital furrow between ocelli, with indistinct short grooves in front of ocelli. Ocelli moderately large, slightly convex; distance between ocelli one and a half to two times as long as distance between ocellus and posterior margin of eye. Antenna with antennomeres gradually widened toward apex, antennomere 4 1.5× as long as wide; length × width of antennomeres (holotype): 1: 0.06 × 0.05; 2: 0.06 × 0.04; 3: 0.07 × 0.03; 4: 0.02 × 0.03; 5: 0.03 × 0.04; 6: 0.03 × 0.05; 7–8: 0.05 × 0.05; 9–10: 0.06 × 0.06; 11: 0.12 × 0.06.

Pronotum transverse, 1.8–1.9 times as wide as long, 1.4 times as wide as head, widest in middle, gradually slightly narrowed anterad and posterad; anterior and posterior angles widely rounded; lateral portions narrow, indistinctly explanate, without pit at middle.

Elytra 1.2 times as wide as long, twice as long as pronotum; latero-apical margins of elytra with very indistinct and smoothed crenulation.

Metatarsus 1.7 times as long as metatibia.

Abdomen with a pair of moderately large oval tomentose spots on middle of tergite V.

Male. Protarsomeres 1–4 slightly widened. Apical margin of abdominal tergite VIII and sternite VIII widely and moderately deeply sinuate. Aedeagus ( Fig. 12 ) with wide basal part of the median lobe gradually narrowing toward apex, with very narrow apical projection; parameres wide, slightly exceeding apex of aedeagus; internal sac moderately long and narrow, with two fields of sclerites consisting of numerous thorns. Aedeagus laterally as in Fig. 13 .

Female. Protarsomeres 1–4 not widened. Apical margins of abdominal tergite VIII and sternite VIII rounded.

Comparative notes. Based on the body size, shape of the pronotum and antennomeres, by the very indistinct punctation of the abdomen and general shape of the aedeagus, the new species is most similar to the Himalayan M. vicina Coiffait, 1982 (Kashmir) , from which it differs by paler coloration of the body with yellow latero-basal and apical portions of elytra, the wider aedeagus, and wider and longer parameres.

Distribution. The new species is known the Meili Xue Shan range in Yunnan, China ( Fig. 9 ).

Bionomics. All specimens were taken by sifting forest floor litter at elevations from 2546 to 3289 m a.s.l.

Etymology. The specific epithet is the Latin adjective maculatus, - a, - um (blotched, maculated). It is alludes to the presence of yellow latero-basal and lateral portions of the elytra.

Figures

FIGURES 1–4. Habitus of Mannerheimia: 1—M. grandilobata (paratype), 2—M. emeishanensis (paratype), 3—M. maculata (paratype), 4—M. taiwanica (holotype).Scale bar:1.0 mm.

FIGURES 9–10. Distribution of Mannerheimia in Yunnan and Sichuan, south-western China (9—M. grandilobata (black circles), M.emeishanensis (white circle), M.maculata (black triangle)) and Taiwan (10—M.taiwanica (black circles)).

FIGURES 12–15. Aedeagus of Mannerheimia maculata (12–13: paratype) and M. taiwanica (14–15: paratype): 12, 14—parameral view, 13, 15—lateral view.Scale bar:0.1 mm.