Mannerheimia taiwanica 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 : 528-531

Mannerheimia taiwanica Shavrin , sp.n.

( Figs. 4 , 10 , 14–15 )

Type material examined: Holotype ♂: ‘ TAIWAN Taichung | Hsien, Hsueshan | Chi-Ka 2463m 6.V.91 | A.Smetana [T67]’ <rectangular label, printed>, ‘? Mannerheimia [handwritten] | M.K. Thayer det. 1998’ <rectangular label, printed>, ‘ HOLOTYPE | Mannerheimia | taiwanica sp.n. | Shavrin A.V. des. 2017’ <red rectangular label, printed> ( NSMT).

Paratypes (4 specimens): 1 ♂ [specimen dissected]: ‘TAIWAN,Nantou | Hsien, Nenkaoshan | Tenchi Hut, 2895m | 7.V.1992 | A. Smetana [T119]’ <rectangular label, printed> (NSMT); 1 ♂ [without aedeagus; apical abdominal segment glued on the same card under the specimen]: ‘TAIWAN Taichung | Hsien, Anmashan | 2225m 3.V.1990 | A. Smetana [T42]’ (CS); 2 ♀: ‘TAIWAN Taichung | Hsien, Anmashan, | 2150 m, 13.V.92 | A.Smetana [T129]’ (NSMT). All paratypes with additional red rectangular label: ‘PARATYPE | Mannerheimia | taiwanica sp.n. | Shavrin A.V. des. 2017’ <red rectangular label, printed> (NSMT)

Description. Measurements (n=5): HW: 0.52–0.59; HL: 0.27–0.33; AL (holotype): 0.72; OL: 0.15–0.17; PL: 0.38–0.46; PW: 0.73–0.87; EL: 0.93–1.01; EW: 1.21–1.27; AW: 1.10–1.18; MTbL (holotype): 0.52; MTrL (holotype): 0.27 (MTrL 1–4: 0.17; MTrL 5: 0.10); AedL: 0.40; TL: 2.02–2.57 (holotype: 2.55).

Body wide and convex. Head, elytra and abdomen reddish-brown (holotype and one paratype with yellowishbrown abdomen); pronotum, laterobasal and sometimes apical portions of elytra, and paratergites yellow-brown; mouthparts, antennomeres and legs yellow. Forebody very shiny, without microsculpture; abdomen with fine isodiametric microsculpture. Head with irregular and sparse punctation, markedly denser on median portion between eyes and distinctly larger and deeper on basal portion of head and on neck; punctation of median portion of pronotum as that in median part of head but more regular and significantly denser, with interspaces between punctures as diameter of 1–3 puncture diameters, punctation of lateral portions of pronotum distinctly smaller, small oval medio-basal portion of pronotum impunctate; scutellum with several large punctures; punctation of elytra sparser than that of pronotum, denser and rugose on prescutellar portion, smaller on lateral and apical portions, median portions of each elytron with six to seven very tangled and vague longitudinal rows of punctures, remaining elytral punctures forming indistinct tangled more or less diagonal rows and becoming irregularly scattered laterally; abdominal tergites without visible punctation. Habitus as in Fig. 4 .

Head transverse, 1.7–1.9 times as wide as long, with distinctly elevated median portion, without occipital furrow between ocelli, with indistinct very short grooves in front of ocelli; anterior portion of head between antennal insertion and anterior margin of eye widely concave. Ocelli large and flattened; distance between ocelli about one and a half to two times as long as distance between ocellus and posterior margin of eye. Antennomere 4 as long as wide; length × width of antennomeres (holotype): 1: 0.09 × 0.05; 2: 0.07 × 0.04; 3: 0.07 × 0.03; 4: 0.03 × 0.03; 5: 0.03 × 0.05; 6: 0.04 × 0.06; 7–8: 0.05 × 0.06; 9: 0.06 × 0.06; 10: 0.06 × 0.07; 11: 0.17 × 0.07.

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

Elytra 1.2–1.3 times as wide as long, distinctly widened apicad, markedly more than twice as long as pronotum; latero-apical margin of elytra without crenulation.

Metatarsus 1.9 times as long as metatibia.

Abdomen slightly narrower than elytra, with a pair of transverse moderately large tomentose spots on middle of tergite V; apical margin of abdominal tergite VII with narrow palisade fringe.

Male. Protarsomeres 1–4 slightly widened. Apical margin of abdominal tergite VIII almost straight. Apical margin of abdominal sternite VIII slightly sinuate. Aedeagus ( Fig. 14 ) with moderately wide basal part of the median lobe gradually narrowing toward narrow rounded apex; parameres wide, significantly distinctly apex of aedeagus, with very wide apical portions, gradually narrowing toward relatively obtuse apex; internal sac complicated, moderately narrow and short, with two fields of sclerites consisting of numerous thorns. Aedeagus laterally as in Fig. 15 .

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

Comparative notes. Based on the body size, pale coloration of the body and general shape of the aedeagus, the new species is most similar to the Japanese M. curtella ( Sharp, 1889) , known from Honshu, from which it differs by the shape of the pronotum (widest at about middle), shorter elytra, as well as by the narrower apical portion of the median lobe of the aedeagus and wider parameres.

Distribution. The new species is known from several locations ( Fig. 10 ) in Taichung Hsien and Nantou Hsien, Taiwan.

Bionomics. Specimens were collected at elevations from 2225 to 2895 m a.s.l. and were taken by sifting from moldy rotten wood, humus and other debris on and along fallen large trees in original forest (locality: T67), from leaf litter and other debris along fallen large trees in original forest (locality: T42), from wet debris (leaf litter twigs, moss) along vertical walls along the trail in open Abies forest with lush undergrowth (locality: T119), from fallen leaves and fermenting parts of buds of deciduous trees, accumulated along the road through mixed deciduous forest (locality: T129).

Etymology. The new species is named after Taiwan where the species was collected.

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.