Mannerheimia emeishanensis 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 : 525-527

Mannerheimia emeishanensis Shavrin , sp.n.

( Figs. 2 , 7–9 )

Type material examined: Holotype ♂ [specimen dissected]: ‘R. CHINA, Sichuan, | Emei Shan, N29°33'6'' | E103°20'6'', 27.vi.-5.vii. | 2009, 1800-2400m, sifti- | ng11-17, V. Grebennikov’ <rectangular label, printed>, ‘ HOLOTYPE | Mannerheimia | emeishanensis sp.n. | Shavrin A.V. des. 2017’ <red rectangular label, printed> ( NSMT).

Paratypes (17 specimens): 1 ♀: same label as the holotype (CS); 1 ♂, 1 ♀: ‘P.R. CHINA, Sichuan, | Emei Shan, N29°33'51'' | E103°20'47'', 23.v.2011, | 1779m, | sift03, V. Grebennikov’ <rectangular label, printed> (CS, NSMT); 1 ♀: ‘P.R. CHINA, Sichuan, | Emei Shan, N29°34'46'' | E103°22'04'', 27.v.2011, | 1463 m, | sift07, V. Grebennikov’ <rectangular label, printed> (CNC); 1 ♂, 4 ♀ [one female without antennae]: ‘P.R. CHINA, Sichuan, | Emei Shan, N29°33'04'' | E103°21'19'', 25.v.2011, | 1729m, | sift05, V. Grebennikov’ <rectangular label, printed> (CNC); 7 ♀: ‘P.R. CHINA, Sichuan, | Emei Shan, N29°33'56'' | E103°21'24'', 26.v.2011, | 1829m, | sift06, V. Grebennikov’ <rectangular label, printed> (NSMT); 1 ♀: ‘P.R. CHINA, Sichuan, | Emei Shan, N29°33'39'' | E103°20'42'', 23.v.2011, | 1852m, | sift04, V. Grebennikov’ <rectangular label, printed> (NSMT). All paratypes with additional red rectangular printed label: ‘PARATYPE | Mannerheimia | emeishanensis sp.n. | Shavrin A.V. des. 2017’.

Description. Measurements (n=18): HW: 0.46–0.50; HL: 0.25–0.29; AL (holotype): 0.60; OL: 0.12–0.14; PL: 0.37–0.42; PW: 0.71–0.82; EL: 0.78–0.86; EW: 0.94–1.12; AW: 0.87–1.04; MTbL (holotype): 0.37; MTrL (holotype): 0.20 (MTrL 1–4: 0.12; MTrL 5: 0.080); AedL: 0.30; TL: 1.75–2.30 (holotype: 2.10).

Body very wide and convex. Yellow-brown to reddish-brown, sometimes head darker and pronotum paler, with yellow margins; mouthparts, antennae, legs, paratergites and apical abdominal tergites yellow. Forebody very shiny, without microsculpture; abdomen with indistinct or distinct isodiametric microsculpture. Head with irregular and sparse, small and moderately deep punctation, distinctly denser on median portion between eyes, sometimes medio-posterior portion of head between posterior third length of eyes impunctate, some paratypes with transverse row of punctures between ocelli; punctation of pronotum sparse, with wide impunctate portion in medio-basal third; scutellum with several small punctures; punctation of elytra as that in pronotum, each elytron with very tangled and vague six longitudinal rows of punctures, remaining elytral punctures forming indistinct to distinct diagonal rows and becoming irregularly scattered laterally; abdominal tergites with indistinct, very small and sparse punctation. Habitus as in Fig. 2 .

Head 1.7–1.8 times as wide as long, without occipital furrow between and grooves in front of ocelli; anterior portion of head between antennal insertion and anterior margin of eye slightly concave. Ocelli indistinct, flattened and large, apical margin of ocelli situated at or slightly behind level of posterior margin of eyes; distance between ocelli about one and a half times as long as distance between ocellus and posterior margin of eye. Antenna with antennomeres gradually widened toward apex, antennomere 4 as long as wide; length × width of antennomeres (holotype): 1: 0.08 × 0.03; 2: 0.07 × 0.02; 3: 0.06 × 0.02; 4: 0.02 × 0.02; 5: 0.03 × 0.03; 6: 0.03 × 0.04; 7–10: 0.05 × 0.05; 11: 0.11 × 0.05.

Pronotum transverse, 1.9 times as wide as long, 1.5–1.6 times as wide as head, widest in middle, gradually slightly narrowed posterad and anterad; anterior angles widely rounded, indistinctly protruded anterad, posterior angles obtuse; lateral portions very narrow and slightly explanate, without pit at middle.

Elytra 1.2–1.3 times as wide as long, significantly widened apicad, two to two and a half times as long as pronotum and sometimes covering first five abdominal tergites; lateral portions of elytra narrow, as in pronotum; latero-apical margins of elytra without crenulation.

Meatatarsus 1.8 times as long as metatibia.

Abdomen slightly narrower than elytra; apical margin of abdominal tergite VIII with very narrow palisade fringe.

Male. Protarsomeres 1–4 slightly widened. Apical margin of abdominal tergite VIII straight or slightly rounded. Apical margin of abdominal sternite VIII widely and moderately deep sinuate. Aedeagus ( Fig. 7 ) with very wide basal part and narrow median lobe gradually narrowing toward rounded apex; parameres distinctly exceeding apex of median lobe; internal sac narrow and moderately long. Aedeagus laterally as in Fig. 8 .

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

Comparative notes. Based on the body size, coloration, shape of the pronotum and general shape of the aedeagus, M. emeishanensis sp.n. is most similar to Japanese M. tsurumii Watanabe, 1990 (central Honshu), from which it differs by the narrower elytra and apical portions of parameres and wider apical part of the median lobe of the aedeagus.

Distribution. The new species is known from several locations in the Emei Shan range ( Fig. 9 ) in Sichuan, China.

Bionomics. All specimens were taken by sifting forest floor litter at elevations from 1463 to 2400 m a.s.l.

Etymology. The species epitet is the Latinized adjective of Emei Shan, a mountain range, where the species occurs.

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 5–8. Aedeagus of Mannerheimia grandilobata (5–6: paratype) and M. emeishanensis (7–8: paratype): 5, 7—parameral view, 6, 8—lateral view.Scale bar: 0.1 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)).