Anthobium fortepunctatum, Shavrin, 2022

Shavrin, Alexey V., 2022, A revision of Eastern Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini). VI. Fortepunctatum group, Zootaxa 5120 (2), pp. 273-282 : 274-279

Anthobium fortepunctatum sp. n.

( Figs 1 , 3–21 , 24–28 )

Type material examined: Holotype ♂: ‘ CHINA: S-Gansu [CH12-05] | W-Qinling Shan , 47 km N Chengxian , | 34°10’17’’N, 105°42’56’’E, 1850 m, | mixed secondary forest margin, | litter sifted , 29.VII.2012, M. Schülke’ <printed>, ‘HOLOTYPE | Anthobium | fortepunctatum sp. n. | Shavrin A.V. des. 2022’ <red, printed> (cSch).

Paratypes (34 specimens): 7 ♂♂ [two specimens dissected], 6 ♀♀ [one specimen dissected]: same data as the holotype (2 ♂♂, 1 ♀♀: cSh; 5 ♂♂, 5 ♀♀: cSch); 1 ♂, 4 ♀♀: ‘ CHINA: S-Gansu [CH12-06] 2012 | W-Qinling Shan, 47 km N Chengxian, | 34°10’20’’N, 105°42’19’’E, 1830 m, | creek valley with second. deciduous | forest, litter sifted, 29.VII. [M.] Schülke’ (1 ♀: cSh; 1 ♂, 3 ♀♀: cSch); 2 ♂♂ [one specimen dissected], 5 ♀♀: ‘ CHINA: S-Gansu [CH12-03] | W-Qinling Shan, 43 km N Chengxian, | 34°08’24’’N, 105°46’43’’E, 1750 m, | moist valley with creek and ponds, | meadow with Artemisia , 28.VII. | 2012, leg. M. Schülke’ (1 ♀: cSh; 2 ♂♂, 4 ♀♀: cSch); 2 ♀♀: ‘ CHINA: S-Shaanxi [CH12-27] | Micang Shan, 42 km S Hanzhong, | 32°40’52’’N, 106°49’16’’E, 1090 m, | NW-slope, mixed forest margin with rocks, litter, grass, and moss sifted, | 14.VIII.2012, leg. M. Schülke’ (cSch); 5 ♂♂ [one specimen dissected], 1 ♀: ‘ CHINA [27] – S-Shaanxi | Micang Shan, 42 km S | Hanzhong, 32°40’52’’N, | 106°49’16’’E, 1090 m, | 14.VIII.2012, V. Assing’ (4 ♂♂: cA; 1 ♂, 1 ♀: cSh); 1 ♀: ‘ CHINA, Shaanxi | Nanwutaishan | 4.IV.2003 leaf litter | G. de Rougemont leg.’ ( OUMNH). All paratypes with additional red printed label: ‘ PARATYPE | Anthobium | fortepunctatum sp. n. | Shavrin A. V. des. 2022’.

One specimen with dissected body parts with the same label as the holotype was not included to the type serie (cSh).

Description. Measurements (n=34): HW: 0.58–0.68; HL: 0.34–0.40; AL (holotype): 1.52; OL: 0.15–0.17; PL: 0.53–0.58; PW: 0.95–1.06; ESL: 1.22–1.33; EW: 1.18–1.49; AW: 1.21–1.35; MTbL (holotype): 0.60; MTrL (holotype): 0.42 (MTrL 1–4: 0.27; MTrL 5: 0.15); AedL: 0.55–0.65; TL: 2.60–3.30 (holotype: 3.05).

Habitus as in Fig. 1 . Head, elytra and abdomen brown to reddish-brown; antennomeres 3–11 or 4–11, pronotum, latero-apical, lateral and basal margins of elytra, and apical segments of abdomen yellow-brown (middle portion of pronotum in some specimens distinctly darker); mouthparts, antennomeres 1–2 or 1–3 and legs yellowish. Body shiny; head with fine transverse microreticulation on apical portion of clypeus (some specimens without or with very indistinct microsculpture); middle portion of neck without or with indistinct and transverse meshes; pronotum, scutellum and elytra without microsculpture; abdomen without or with indistinct and fine, transverse microreticulation. Head with sparse, deep and large punctation, sparser and sometimes finer in middle; neck with sparse and moderately fine punctation; punctation of pronotum somewhat irregular, denser and larger than that on head, sometimes larger and deeper in mediobasal and finer and sparser in basal portions, sometimes with impunctate area in mediobasal part; punctation of elytra large, about as that on pronotum, moderately dense, coarser in parascutellar area and finer along suture (some specimens with very dense, deep and large punctures in mediobasal portion), on each elytron forming five to seven tangled and vague longitudinal rows of punctures; abdomen without visible punctures. Body glabrous; apical and latero-apical parts of clypeus with moderately long tactile setation; middle part of pronotum sometimes with irregular and short semierect setae; abdominal tergites with very sparse and fine setae on paratergites.

Head transverse, 1.7 times as broad as long, with moderately strongly elevated supra-antennal prominences and slightly elevated middle portion, with distinctly elongate frontal portion and deeply impressed latero-basal area from antennal insertions to about level of apical margins of eyes, without or with indistinct semicircular impression in mediobasal portion; anteocellar foveae (grooves in front of ocelli) missing or very short and moderately deep, about as long as diameter of ocellus or slightly longer; postocular ridges acute, with distance between posterior margin of eye and postocular ridge about as long as combined length of two-three nearest ommatidia; latero-basal portions short, sharply narrowed toward neck; anterio-lateral portion between antennal insertion and anterior margin of eye somewhat elongate, slightly concave. Ocelli large, convex, situated about at level of postocular ridges; distance between ocelli slightly longer than distance between ocellus and posterior margin of eye. Eyes very large, strongly convex. Gular sutures with rounded apical parts, widely divergent posteriad; distance between sutures moderately short, shortest distance located at level slightly above posterior margins of eyes ( Fig. 8 ). Labrum moderately short, with widely rounded membranous latero-apical portions, wide apical emargination, and long, narrow laterobasal projections (internally, under clypeus) ( Fig. 3 ). Mandibles moderately short, with wide basal part and elongate, strongly curved apical portions, with small subtricangulat tooth slightly above middle of right mandible ( Fig. 4 ). Labium and labial palpomeres narrow ( Fig. 6 ). Mentum narrow, strongly transverse ( Fig. 7 ). Maxilla as in Fig. 5 ; maxillary palpomeres moderatele long, with very wide preapical palpomere and moderately short and narrow apical palpomere, about 1.6 times as long as preceding segment, gradually narrowed from basal portion toward rounded apex; galea moderately wide and long, distinctly exceeding apex of lacinia; lacinia moderately wide, with unarticulated spinelike apex and several spines and setae along median margin. Antenna moderately short, reaching basal portion of elytra when reclined, with slightly elongate antennomeres; basal antennomere about three times as long as broad, antennomere 2 slightly narrower than basal antennomere, 3 about as long as and slightly narrower than 2, 4 distinctly shorter than 3, 5–7 slightly longer and broader than 4, 8–9 slightly shorter than 7, 10 shorter than 9, apical antennomere about 1.4 times as long as preapical segment, from middle gradually narowed toward subacute apex.

Pronotum distinctly transverse and narrow, 1.7–1.8 times as broad as long, 1.5–1.6 times as broad as head, widest about middle, distinctly more narrowed posteriad than anteriad, with widely rounded anterior angles, slightly protruded anteriad; posterior angles widely rounded; apical margin widely rounded, sometimes markedly protruded anteriad, about as long as rounded posterior margin; middle portion strongly elevated, without impressions; lateral edges without crenulation; lateral portions widely impressed, without or with indistinct small and oval pit slightly in front of middle. Prothorax with long and very narrow intercoxal process and widely protruded mesosternal processes ( Fig. 9 ). Mesoventrite transverse, with very deep apical emargination and acute interocxal process almost reaching apex of posterior margin of procoxae ( Fig. 12 ). Scutellum moderately large, with elongate apical portion and rounded apex ( Fig. 10 ). Metaventrite transverse, with very wide and deep intercoxal cavities and moderately wide intercoxal process with subacute apex ( Fig. 13 ). Metendosternite as in Fig. 14 .

Elytra very convex, distinctly more than twice as long as pronotum, about as long as or slightly broader than long, slightly or significantly broadened posteriad, reaching apical margin of abdominal tergite IV or V, with widely rounded apical margins; humeri widely rounded, not protruded anteriad ( Fig. 11 ); latero-basal edges without or with very indistinct crenulation; lateral portions very narrow, flattened and slightly explanate. Hind wings fully developed.

Legs moderately long and slender; meso- and metatibiae covered by long setation; metatarsus 1.4 times as long as metatibia.

Abdomen about as broad as or slightly narrower than elytra, with a pair of small oval tomentose wing-folding patches in middle of tergite V, with very narrow palisade fringe on inner margin of abdominal tergite VII.

Male. Protarsomeres 1–4 very wide. Abdominal tergite VIII ( Fig. 15 ) and sternite VIII ( Fig. 16 ) concave. Aedeagus with moderately wide basal portion, slightly narrowed toward widely rounded apex; parameres slightly exceeding apex of median lobe, with very wide apical portions and long apical seta; internal sac very long, spirally folded in basal portion, with paired, moderately long thorn-shaped structures in apical portion ( Fig. 20 ). Lateral aspect of aedeagus as in Fig. 21 .

Female. Protarsomeres 1–4 narrow. Abdominal tergite VIII truncate ( Fig. 17 ). Abdominal sternite VIII widely rounded ( Fig. 18 ). Genital segment with narrow and elongate sternite IX, gonocoxites narrow and long, styli elongate and narrow, each with long seta ( Fig. 19 ).

Comparative notes. Based on the coloration and the body length, A. fortepunctatum sp. n. is similar to A. flavoguttatum sp. n., from which it differs by the somewhat longer pronotum, shorter elytra with moderately large and sparse punctation, and wider apical portions of the parameres of the aedeagus.

Distribution. This species is known from several localities in Qinling Shan (Gansu), Micang Shan and Nanwutaishan (Shaanxi), China ( Fig. 24 ).

Bionomics. The specimens were collected at elevations from 1090 to 1850 m a.s.l. by sifting litter in mixed secondary forest margin (locality: CH 12–05), creek valley with secondary deciduous forest (locality: CH 12–06; Fig. 27 ), moist valley with creek and ponds, meadow with Artemisia ( Figs 25–26 ), and were sifted from litter, grass and mosses at mixed forest margin with rocks ( Fig. 28 ).

Etymology. The specific epithet is a combination of Latin adjective fortus, - um, - a (strong) and punctatus, -um, -a (punctated, spotted). It refers to the strong punctation of the pronotum and the elytra.

Figures

FIGURE 24. Distribution of Anthobium in China: A. fortepunctatum (black circles), A. flavoguttatum (black square).

FIGURES 25–28. Type localities of Anthobium fortepunctatum in the Qinling Shan range in Gansu (Figs 25–27) and Micang Shan, Shaanxi, China (Fig. 28) (photograph: M. Schülke).

FIGURES 1–2. Habitus of species of Anthobium: 1—A. fortepunctatum (paratype), 2—A. flavoguttatum (paratype). Scale bar: 1.0 mm.

FIGURES 3–7. Mouthparts (dorsal view) of Anthobium fortepunctatum: 3—labrum, 4—mandibles (left and right), 5—maxilla (left), 6—labium, 7—mentum. Scale bar: 0.1 mm.

FIGURES 8–19. Anthobium fortepunctatum: 8—ventral aspect of head (ventral view), 9—ventral aspect of prothorax (ventral view), 10—scutellum (dorsal view), 11—ventral aspect of elytron, 12—ventral aspect of mesoventrite, 13—ventral aspect of metaventrite (without metanepisternum), 14—metendosternite (ventral view), 15—male abdominal tergite VIII (dorsal view), 16—male abdominal sternite VIII (ventral view), 17—female abdominal tergite VIII (dorsal view), 18—female abdominal sternite VIII (ventral view), 19—female genital segment (ventral view). Scale bar: 0.1 mm.

FIGURES 20–23. Aedeagus of Anthobium fortepunctatum (Figs 20–21; paratype) and A. flavoguttatum (Figs 22–23; holotype): 20, 22—parameral view, 21, 23—lateral view. Scale bar: 0.1 mm.