Geodromicus, Redtenbacher, 1857

Shavrin, Alexey V., 2021, A new species of Geodromicus Redtenbacher, 1857 from Sichuan (Coleoptera Staphylinidae: Omaliinae: Anthophagini), Zootaxa 4985 (3), pp. 443-446 : 443-446

Geodromicus (s.str.) hajeki Shavrin, sp.n.

( Figs. 1–4 )

Type material examined: Holotype ♂ [dissected]: ‘ CHINA: SicHuan = PRov., | Wolong National Res., | YincHanGGou vill. env., | PanDa =vallEY, 2120 m, | 30°58'27''N 103°07'18''E,’ <printed>, ‘ 24.VI.2014, side valley with | stream; individually on vege- | tation, under stones and wood | J. Hájek & J. Růžička leg.’ <printed >, ‘ HOLOTYPE | Geodromicus (s.str.) | hajeki sp.n. | Shavrin A.V. des. 2021’ <red, printed> ( NMPC) .

Paratypes: 4 ♂♂ [two specimens dissected; one male without left apical antennomere], 4 ♀♀ [one specimen without left antennomeres 9–11]: ‘ CHINA: SicHuan = PRov., | 37 km N Baoxing, Qiao Qi vill., | Jiajin Shan Nat. Forest Park, | 14.- 16.VI. 2014, 2480 m, | 30°41.2'N 102°42.3'E,’ <printed>, ‘individually from vegetation; flowering Rosa ; marsh; | along stream; in horse dungs | J. Hájek, J. Růžička & M. Tkoč leg.’ <printed> (2 ♂♂, 1 ♀: CS; 2 ♂♂, 3 ♀♀: NMPC) ; 4 ♂♂ [two specimens dissected], 1 ♀: ‘ CHINA: W-Sichuan 20. VI. 1999 | Ya`an Prefecture. Tianguan Co. | E Erlang Shan Pass , 2900 m | 9 km SE Luding, 29°52N, | 102°18E, Bachufer, Moos + | Schotter, leg. M. Schülke’ <printed> (3 ♂♂, 1 ♀: CSC, 1 ♂: CS) ; 2 ♂♂ [one specimen dissected]: ‘ CHINA W. Sichuan (Ya`an | Pref., Tianquan Co.) | E Erlang Shan Pass , 2900m | 9km SE Luding, 29°52N / | 102°18E (brook bank) | 20.-22.VI.1999. D.W. Wrase’ <printed> (1 ♂: CSC, 1 ♂: CS). All paratypes with additional red printed label: ‘ PARATYPE | Geodromicus (s.str.) | hajeki sp.n. | Shavrin A.V. des. 2021’.

Description. Measurements (min-max; n=15): maximum width of head including eyes: 0.75–0.97; length of head (from base of labrum to posterior constriction along head midline): 0.50–0.64; ocular length (longitudinal): 0.20–0.24; length of temple: 0.10–0.14; length of antenna (holotype): 2.81; length of pronotum: 0.66–0.85; maximum width of pronotum: 0.87–1.10; minimum width of pronotum: 0.67–0.87; sutural length of elytra (length of elytra from apex of scutellum to posterior margin of sutural angle): 1.10–1.57; maximum width of elytra: 1.55–1.91; length of metatibia (holotype): 1.25; length of metatarsus (holotype): 0.45 (MTrL 1–4: 0.20; MTrL 5: 0.25); maximum width of abdomen: 1.70–1.98; length of aedeagus (from base of median lobe to apex of parameres): 1.02–1.15; total length of the body (from anterior margin of clypeus to apex of abdomen): 3.95–5.35 (holotype: 4.75).

Body and antennomeres reddish-brown to dark-brown (base of pronotum usually slightly paler); mouthparts, basal portions of antennomeres 1–2 and legs yellow-brown; tarsi and sometimes apical portions of tibia yellow. Body glossy; head with distinct transverse microsculpture between antennal insertions and with moderately large, irregular, smooth sculpture in middle portion, with relatively rugose microreticulation between supra-antennal protuberances and apical margins of eyes and on infraorbital ridges; neck with distinct isodiametric sculpture; pronotum with indistinct or distinct isodiametric or transverse microreticulation; middle portion of scutellum with fine cellular sculpture; abdominal tergites with distinct, dense, transverse microsculpture. Pubescense of forebody yellow, long and semi-erect, longer on head and pronotum; abdomen with thin and dense, decumbent pubescence. Habitus as in Fig. 1 .

Head 1.5 times as broad as long; temples long, about twice as short as longitudinal length of eyes; interocellar depression moderately deep, narrowest between ocelli, slightly widened apicad, separated from infraorbital ridges by convergent latero-anteriad, deep anteocellar foveae (grooves in front of ocelli), reaching apical third of eyes. Eyes large, convex. Ocelli large, distance between ocelli slightly longer than distance between ocellus and posterior margin of eye. Punctation fine and irregular, very sparse in middle, markedly denser and deeper on lateral portions. Apical segment of maxillary palpi about 1.3 times as long as preapical segment. Antennae long, exceeding apical fourth or apical margin of elytra when reclined; basal antennomere moderately wide, antennomere 2 distinctly narrower and significantly shorter than basal antennomere, 3–4 slightly narrower and distinctly longer than 2, 5–7 slightly longer and broader than 4, 8–9 slightly shorter than 7, 10 slightly shorter than 9, apical antennomere about 1.3 times as long as preapical antennomere.

Pronotum convex, slightly broader than head, widest in anterior third, with widely rounded anterior angles and sharply narrowed toward obtuse basal angles; narrowest basal part subparallel, with slightly concaved margins; anterior margin somewhat straight or rounded; posterior straight or slightly concaved; middle portion with indistinct longitudinal depression, more visible in medioapical portion, and with small, oval depression in mediobasal third. Punctation irregular and moderately sparse, larger and deeper than that on head, with interspaces between punctures as broad as an average diameter of two-three nearest punctures.

Scutellum large, with widely rounded apex, without or with several very fine punctures in middle.

Elytra slightly convex, transverse, 1.2–1.4 times as broad as long, 1.6–1.8 times as long as pronotum, significantly widened posteriad; lateral margins narrowly flattened and slightly reflexed; hind margins rounded. Punctation markedly larger and deeper than that on pronotum. Wings fully developed.

Abdomen slightly broader than elytra, with two large, transverse tomentose spots in middle of abdominal tergite IV and with very narrow palisade fringe on apical margin of abdominal sternite VII. Punctation indistinct, very fine.

Male. Protarsomeres 1–4 wide. Apical margin of abdominal tergite VIII straight. Apical margin of abdominal sternite VIII widely sinuate. Aedeagus ( Fig. 3 ) with small basal portion and moderately long median lobe, from apical portion gradually narrowed toward subacute apex; parameres narrow, distinctly longer than median lobe, with four short apical setae; internal sac wide, with elongate slightly sclerotized structure in middle portion and long flagellum, spirally folded in basal part. Lateral aspect of aedeagus as in Fig. 4 .

Female. Protarsomeres 1–4 narrow. Apical margins of abdominal tergite VIII and sternite VIII straight or slightly rounded.

Comparative notes. Regarding the general morphology of the aedeagus, G. (s.str.) hajeki sp.n. belongs to the lestevoides group ( Shavrin 2018). Based on the length of temples, general shapes of the pronotum and the elytra distinctly broader than long, it is somewhat similar to G. szechwanensis Bernhauer, 1943, widely distributed in central China ( Cheng et al., 2020), but differs by the darker coloration, the presence of microreticulation on the pronotum, wider apical portion of the elytra, narrower and longer parameres with significantly shorter apical setae, and different structures of the internal sac.

Distribution. The species is known from several locations in Qionglai and Erlang Shan ranges in Sichuan, China ( Fig. 2 ).

Bionomics. Specimens were collected at elevations from 2120 to 2900 m a.s.l. and were taken from under stones near banks of streams; some specimens were sifted from moss and gravel near the stream.

Etymology. The species is named in honor of my colleague Jiři Hájek (Prague), one of the collectors of the type specimens.

Figures

FIGURES 1–4. Habitus (Fig. 1), distribution (Fig. 2) and aedeagus (Figs. 3–4) of Geodromicus (s.str.) hajeki: 3—parameral view, 4—lateral view. Scale bar: 1.0 mm (Fig. 1), 0.1 mm (Figs. 3–4).