Thinobius shavrini, Makranczy & H-, 2014

Makranczy, György, 2014, The Far Eastern species of Thinobius Kiesenwetter, 1844 (Coleoptera: Staphylinidae, Oxytelinae) lacking female modified genital appendage, Revue suisse de Zoologie 121 (3), pp. 319-347 : 336-339

Thinobius shavrini sp. nov. Figs 6, 13-14, 20-22, 36, 48-49, 61-63, 80, 84, 86

TYPE MATERIAL: CNCI, holotype (3); “ ALASKA, Alaska Range, Antimony Crk. [63°08'N, 149°22'W], 3500', 2.5mi E. mi. 181, G.[eorge] Parks Hwy.; 27.VI.[19]78; [leg.] [A.] Smetana & [E.C.] Becker” .

PARATYPES (2): CNCI, 1♀; ALASKA, Alaska Range, Antimony Crk., 3500', 2.5mi E. mi. 181 Hwy. [Alaska Route] 3; 27.VI.[19]78; [leg.] [A.] Smetana & [E.C.] Becker. – MHNG , 1♀; RUSSIA, East Siberia , Chita Area , Kyrenskiy distr., Sokhondinskiy Nat. Res., up. Zolotoy stream (right trib. Agutsa r.), 49°45.353' N, 111°11.670' E, h= 1580m; 25.07.2009; [leg.] A.V. Shavrin, I.V. Enushchenko, in mosses and litter near stream .

DESCRIPTION: Habitus as in Fig. 6. Measurements (n=3): HW = 0.37 (0.36- 0.37); TW = 0.38 (0.37-0.38); PW = 0.42 (0.405-0.425); SW = 0.43 (0.42-0.44); AW = 0.51 (0.49-0.53); HL = 0.32 (0.32-0.33); EL = 0.08 (0.075-0.08); TL = 0.12 (0.115- 0.12); PL = 0.32 (0.31-0.325); SL = 0.49 (0.48-0.51); SC = 0.45 (0.44-0.46); FB = 1.22 (1.21-1.23); BL = 2.51 (2.43-2.66) mm. BODY more or less unicoloured. Head, pronotum and abdomen reddish dark brown, elytra reddish medium brown. Legs, mouthparts and antennae reddish medium to light brown. All main body parts with coriaceous microsculpture intermixed with fine and dense punctation, making body moderately lustrous. Head with fine and dense punctation but on vertex with larger and deeper punctures, on larger interspaces microsculpture visible; pronotum and elytra with very fine and very dense punctation, microsculpture stronger (slightly imbricate) on elytra. Abdomen with transversal coriaceous microsculpture (Fig. 36) plus fine and dense punctation especially posteriorly, apex of tergite VII and the whole tergite VIII shiny (transversal coriaceous microsculpture), almost without punctures. Pubescence on forebody depressed, very fine, medium short; on abdomen fine and medium short setae plus a row of stronger and longer setae on apices of tergites (a few similar setae occasionally also on discs of tergites). Abdominal sides and apex with a few darker, longer and stronger bristles. Strong dark bristle on outer side of supraantennal prominence at anterior border of eye and on posterior edge of vertex adjacent to temples, similar ones right behind anterior pronotal corner and on side at 3/5 length. Direction of setation anterior on sides of head, medial on most of disc, postero-medial in midline; anterior on pronotal sides, posterior edge and midline, antero-medial on rest of disc. Stronger setae in middle of anterior pronotal edge. Elytra and abdomen with posteriorly directed setae. Antennae, legs and mouthparts with very short, not conspicuous setation, except for the stiff, darker bristle slightly distad from middle of each FIGS 45-54

(45-47) Thinobius zerchei Gildenkov ; scutellum (45), 3 sternite VIII, dorsal view (46), antenna (47). (48-49) T. shavrini sp. n.; scutellum (48), antenna (49). (50) T. schillhammeri sp. n.; antenna. (51-52) T. injae sp. n.; antenna (51), antennomeres 10-11 (52). (53) T. paraminor sp. n.; antennomeres 3-6. (54) T. yabakeinis Naomi ; tergites IV-VII. Scale bar = 0.035 mm for 53, 0.055 mm for 45, 53, 0.07 mm for 48, 51, 0.1 mm for 46, 0.12 mm for 50, 54, 0.14 mm for 47, 49.

tibia and ones near apices of femora. Sides of elytra with three stiffer setae on side but middle one slightly shifted posteriorly.

Head (Fig. 20) 1.18x wider than long, temples (Fig. 13) slightly widening anteriorly and are curved, narrowing and more narrowly rounded posteriorly. Anterior part of vertex slightly impressed on both sides near inner borders of supraantennal prominences. Anterior border of neck not marked with groove, only by change of microsculpture. Frontoclypeal suture appearing as fine, often shinier groove and darker line connecting supraantennal tubercles. ANTENNAE rather short (Fig. 49) with antennomeres 4 and 6 slightly transverse, 5, 7 and 8 conical apically.

Pronotum (Fig. 21) transverse, 1.40x wider than long, a little bit wider than head, anterior margin gently arched, anterior corners rather narrowly rounded, but more or less obtuse-angled. Sides more strongly arched in anterior half than posterior, posterior angles not too conspicuous, but sides not forming evenly arched line with posterior margin, latter straight or even minutely concave in the middle 1/5. Very gentle impressions on pronotal disc at both sides of midline but further away from it; anterior part of disc and middle of sides with similarly inconspicuous impressions. Pronotal marginal bead visible on posterior margin. Scutellum (Fig. 48) large, setose and dull. ELYTRA (Fig. 14) moderately long, one elytron up to twice as long as broad, quite flat and parallel-sided (very little dilation posteriorly). Shoulders weakly developed. Along suture with thin marginal bead. Sutural corners moderately broadly rounded. LEGS of medium length, tarsal lobes thin but relatively long (but not reaching apex of last tarsomere), tibiae rather fusiform, appear much wider in middle than at ends.

Abdomen very weakly fusiform, sides more or less straight and parallel; widest in the middle, at least as wide as elytra at broadest point. Posterior margin of tergite VII with palisade fringe, moderately broad but somewhat widening in middle.

PRIMARY AND SECONDARY SEXUAL FEATURES: Sexes not appearing different in regular dorsal view. Posterior corners of tergite VIII (similar in both sexes) gently protruding (Fig. 22), posterior edge otherwise straight. Male sternite VIII as in Fig. 61, tergite IX as in Fig. 62, sternite IX as in Fig. 63. Aedeagus as in Fig. 80, female genital appendage as in Fig. 84, spermatheca as in Fig. 86.

ETYMOLOGY: The species is named after one of the collectors of the Siberian paratype, Alexey V. Shavrin (currently Daugavpils, Latvia) who contributed most interesting East Palaearctic material to several revisional projects of mine .

REMARKS: A species with rather small and flat eyes, transverse antennomeres and relatively short elytra.

DISTRIBUTION: Known from two distant localities (Alaska Range and Chita

Area), but expected to have a distribution connecting these areas.

BIONOMICS: According to the collector of the holotype (Aleš Smetana) the collecting place was in a mountain valley with a fairly large, fast creek, where Thinobius was obtained from under small rocks along edges of the creek (low grassy vegetation and some moss), and by sifting wet moss and various debris at the same habitat. The Siberian paratype was collected from litter near gravel (Fig. 8) or from wet gravel together with specimens of Ochthephilus , Lobrathium , Stenus etc.

FIGS 55-61

(55-57) Thinobiusparaminor sp. n. 3; sterniteVIII (55), tergiteIX (56), sterniteIX (57). (58-60) T. schillhammeri sp. n. 3; sterniteVIII (58), tergiteIX (59), sterniteIX (60). (61) T. shavrini sp. n. 3; sternite VIII. Scale bar = 0.07 mm for 60, 0.08 mm for 56-57, 0.1 mm for 55, 58-59, 0.2 mmfor 61.