Quedius (Microsaurus) amurensis, Smetana & Shavrin, 2018

Smetana, Tephens & Shavrin, A., 2018, Contribution to the knowledge of the genus Quedius S, 1829 of Siberia and Russian Far East (Coleoptera: Staphylinidae: Staphylinini: Quediina), Linzer biologische Beiträge 50 (1), pp. 825-836 : 830-831

Quedius (Microsaurus) amurensis SMETANA nov.sp. ( Figs 7-11 , 23 )

T y p e l o c a l i t y. RUSSIA: Amurskaya obl., Skovorodinskiy r-n., lev. ber. r. Urka, ok 8 km S p. Erofei Pavlovich, N 54˚ 02’24.84’’ E 121˚ 58’ 30.69’’, h= 552 m.

T y p e m a t e r i a l. Holotype (♂), RUSSIA: "Amurskaya obl., Skovorodinskiy r-n., lev. ber. r. Urka, ok 8 km S p. Erofei Pavlovich, 54˚ 02’24.84’’ N ♀ 121˚ 58’ 30.69’’E, h= 552 m, 28- 29.08.2014, A.V. Shavrin, I. V. Enushchenko ". [Amur Area, Skorovodinskiy District, left side of Urka river , about 8 km N Yerofey Pavlovitch, 54˚ 02’24.84 N / 121˚ 58’ 30.69’’E, h= 552 m, 28- 29.08.2014, A.V. Shavrin, I. V. Enushchenko]. Deposited in ZMM.

D i a g n o s i s. Species similar in external characters to both Q. simulans SHARP, 1874 and Q. klapperichi SMETANA, 1996, but different mainly by the aedoeagus with paramere wide, covering the entire median lobe.

D e s c r i p t i o n. In all external characters similar to Q. klapperichi , but different as follows: size smaller than average specimens of Q. klapperichi , head shorter and wider, distinctly wider than long (ratio 1.20, corresponding ratio for Q. klapperichi 1.12); microsculpture distinctly finer and more superficial; antenna similar to that of Q. klapperichi , but distinctly more slender and shorter, with outer segments 7-10 distinctly transverse. Pronotum shorter and wider, more markedly wider than long (ratio 1.19, corresponding ratio for Q. klapperichi 1.10); left dorsal row with only two, right one with three punctures; scutellum with only a few punctures; elytra markedly shorter than those of Q. klapperichi , at suture about as long as, at sides longer than pronotum at midline (ratio 1.15); punctation and setation less dense than in Q. klapperichi ; punctation of abdominal tergites similar to that of Q. klapperichi , but in general somewhat less dense.

Male. First four segments of front tarsus moderately dilated, sub-bilobed, each densely covered with tenent setae ventrally; segment 2 about as wide as apex of tibia; segment 4 narrower than preceding segments. Sternite 7 with slight medioapical sinuation; sternite 8 with four macrosetae at right side and three on left side, apical margin with wide, moderately deep, obtusely triangular medioapical emargination, a long, narrow area before emargination, reaching basal third of sternite, devoid of pubescence ( Fig. 7 ); tergite 10 evenly narrowed toward arcuate apex, with a few long setae at apex and some shorter setae in front of them ( Fig. 8 ); sternite 9 not appreciably different from that of Q. klapperichi ( Fig. 9 ). Aedoeagus ( Figs 10, 11 ) markedly different from those of both Q. simulans and Q. klapperichi ; median lobe narrow, subparallelsided, anteriorly narrowed into narrow apical part with acute apex; paramere large, wide, entirely covering median lobe, anteriorly narrowed into subacute apex surpasing distinctly apex of median lobe; four apical setae, medial pair considerably longer than lateral pair and two short setae at each lateral margin close to apex; underside with numerous sensory peg setae, forming irregular long row along each lateral margin of apical portion of paramere.

Female unknown.

Length 6.8 mm.

E t y m o l o g y. The specific epithet is the Latinized adjective derived from the name of the river Amur and by adding the suffix - ensis, denoting the place of origin.

G e o g r a p h i c a l d i s t r i b u t i o n. Quedius amurensis is at present known only from the type locality in Amur area.

B i o n o m i c s. The specimen was sifted from litter and mosses at swampy site along a forest road with Ledum palustre, Vaccinium uliginosum, Calamagrostis purpurea, C. obtusata, Carex spp. and Sphagnum spp. in a mixed forest with Larix gmelinii, Betula fruticosa, B. platyphylla and Salix spp. ( Fig. 23 ).

C o m m e n t s. The holotype bears an additional, small setiferous puncture anteriomediad of right posterior frontal puncture and it is missing the last segment of right front tarsus.

Figures

Figs 1-11: 1-6. Quedius conviva nov.sp. (1)- apical portion of male sternite 8; (2) tergite 10 of male genital segment; (3) sternite 9 of male genital segment; (4) aedoeagus, ventral view; (5) apical portion of underside of paramere with sensory peg setae; (6) tergite 10 of female genital segment. 7-11. Quedius amurensis nov.sp. (7) apical portion of male sternite 8; (8) tergite 10 of male genital segment (9) sternite 9 of male genital segment; (10) aedoeagus, ventral view; (11) apical portion of underside of paramere with sensory peg setae.

Figs 22-23: (22) Type locality of Quedius conviva nov.sp.; (23) Type locality of Quedius amurensis nov.sp.