Quedius (Microsaurus) conviva, 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 : 826-827

Quedius (Microsaurus) conviva SMETANA nov.sp. ( Figs 1-6 , 22 )

T y p e l o c a l i t y: RUSSIA:ESiberia,Irkutskayaoblast,Angarsk,right side of Kitoy River, N52˚ 29’30,4" E103˚ 47’58,8", 410 m.

T y p e m a t e r i a l: Holotype (♂) and allotype (♀): ROSSIA: "E Siberia, Irkutskaya oblast, Angarsk, right side of Kitoy R., 9.VI.2010 Enushchenko I.V. / the hole of Citellus undulatus / N52˚ 29’30,4" E103˚ 47’58,8". The holotype is deposited in ZMM, allotype in NSMT. Paratype (♀): "East Siberia, Irkutsk Area, Amgarsk, right side of Kitoy River, 52˚29’30.4"N 103˚47’58.8"E, 8.C.2017, Enushchenko I. V., 410 m a.s.l., the burrow of Citellus undulatus " (in ZMM).

Diagnosis. A distinctive species, characterized, in addition to the shape of the aedoeagus, by the dark coloration in combination with the chaetotaxy of the head (position of both the posterior frontal and temporal punctures), and of the pronotum (dorsal rows each with only two punctures, and sublateral rows missing). Quedius citelli KIRSHENBLAT, 1933, another species occurring in the burrows of the ground squirrel Spermophilus dauricus BRANDT, 1843 inTransbaikalia (Adun-Tshelon range (50˚ 33’N 116˚ 11’E), southeast of Chita Area), differs by the body coloration (appendages and elytra reddish), by the chaetotaxy of the pronotum (dorsal rows each with three punctures and sublateral rows present), and by the different aedoeagus (see BOHÁČ 1988: 550, Fig. 7 ).

D e s c r i p t i o n. Black, elytra with vague metallic hue, apical margins of abdominal tergites vaguely, narrowly paler. Mandibles black, maxillary and labial palpi testaceous. Antennae dark brownish, with first three segments more or less darkened, legs, including tarsi, piceous, or with tarsi vaguely paler. Head of rounded quadrangular shape, visually as long as wide, but measured vaguely wider than long (ratio 1.07), about parallelsided behind eyes, posterior angles obsolete; eyes rather small and flat, feebly convex, tempora slightly longer than eyes seen from above (ratio 1.20); no additional setiferous punctures between anterior frontal punctures; posterior frontal puncture shifted markedly posteriad, situated closer to posterior margin of head than to posteriomedial margin of eye; temporal puncture shifted posteriad, separated from posterior margin of eye by distance about twice as long as distance from posterior margin of head; two basal punctures at posterior margin of head on each side (see Comments); surface of head with fine and dense transverse to slightly oblique waves, with distinct micropunctulation; neck with microsculpture finer and denser than that on head and with a few scattered micropunctulae. Antennae short, slightly incrassate apicad, segment 3 slightly longer than segment 2, segment 4 as long as wide, segments 5-10 gradually becoming shorter and wider, outer segments 9 and 10 slightly wider than long, last segment about as long as two preceding segments combined. Pronotum wider than long (ratio 1.16), widest at about posterior third, markedly narrowed anteriad, with lateral margins continuously arcuate with broadly rounded base, transversely convex, lateral portions not explanate; dorsal rows each with two setiferous punctures; sublateral rows missing; microsculpture similar to that on head, but slightly finer and denser, with micropunctulation less apparent. Scutellum impunctate, surface with very fine and dense microsculpture of transverse waves. Elytra moderately long, at base narrower than pronotum at widest point, not appreciably dilated posteriad, at suture as long as, at sides slightly longer than pronotum at midline (ratio 1.11); punctation fine, dense, transverse interspaces between punctures mostly somewhat larger than diameters of punctures; pubescence piceous; surface between punctures without microsculpture; wings fully developed. Abdomen with tergite 7 (fifth visible) with fine whitish apical seam of palisade setae; tergite 2 (in front of fully visible tergite 3) impunctate, but with micropunctulae along posterior margin; punctation of abdominal tergites moderately fine and dense, more or less evenly covering each tergite, becoming in general gradually sparser toward apex of abdomen; pubescence piceous; surface between punctures with exceedingly fine microsculpture of broken striae.

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 8 with two macrosetae on each side, apical margin with wide, moderately deep, obtusely triangular medioapical emargination, small triangular area before emargination flattened and smooth ( Fig. 1 ). Genital segment with tergite 10 markedly, evenly narrowed toward arcuate apex, with two stronger and a few finer setae at apex and with a few fine setae in front of them ( Fig. 2 ); sternite 9 with basal portion small; apical portion with slightly emarginated apex, densely and finely setose ( Fig. 3 ). Aedoeagus ( Figs 4, 5 ) small, short; median lobe with wide, parallelsided apical portion with wide, slightly, asymmetrically, arcuate apex; paramere of characteristic shape, with apex not reaching apex of median lobe; four apical setae and two shorter setae at right margin and one shorter seta at left margin below apex; sensory peg setae on underside numerous, situated as in Fig. 5 .

Female. First four segments of front tarsus similar to those of male, but less dilated, segment 2 slightly narrower than apex of tibia (ratio 0.90). Tergite 10 of genital segment with slightly differentiated apical portion and medioapical portion markedly pigmented; with several long apical setae and with shorter setae along each lateral margin of pigmented portion of tergite ( Fig. 6 ).

Length 8.5-9.0 mm.

E t y m o l o g y.The specific epithet is the Latin masculine noun conviva, - ae, m. (a guest) in apposition. It refers to the "guest" occurrence of the species in rodent burrows.

B i o n o m i c s. Specimens were collected from the burrows of Urocitellus undulatus ( PALLAS, 1778) on right side of Kitoy river, up-stream of mouth of Malaya Yelovka river, on 1 st floodplain’s terrace; edge of Pinus sylvestris forest, with grasses (Calamagrostis spp.); sandy soil with river’s alluvium ( Fig. 22 ). The paratype was collected together with specimens of Coprophilus sibiricus BERNHAUER, 1915 and Bisnius sp.

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 conviva is at present known only from the type locality northwest of Irkutsk in the vicinity of Angarsk, south-eastern Cisbaikalia.

C o m m e n t s. The female allotype bears an additional, small setiferous puncture between the posteriomedial margin of eye and the posterior frontal puncture on left side.

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.