The Far Eastern species of Thinobius Kiesenwetter, 1844 (Coleoptera: Staphylinidae, Oxytelinae) lacking female modified genital appendage Author Makranczy, György text Revue suisse de Zoologie 2014 2014-09-30 121 3 319 347 journal article 10.5281/zenodo.6120089 0035-418X 6120089 AC5D93F0-A61E-4550-8973-C4BF90E30A14 Thinobius injae sp. nov. Figs 1, 9-10, 23, 31, 43, 51-52, 73-77 TYPE MATERIAL: HNHM, holotype (3); “S-KOREA, Gangwon-do , Injae-gun district , 2 km E Inje , Naerincheon river , sand at W end of bridge, 200 m , gravel/sand border at water, flotation (2B), 38°03'59"N , 128°11'27"E ; 08.IX.2010 ; [leg.] Makranczy & al”. PARATYPES (2): MHNG 1 , NIBR 1♀ ; same data as holotype . DESCRIPTION: Habitus as in Fig. 1. Measurements (n=3): HW = 0.23 (0.22- 0.25); TW = 0.22 (0.21-0.24); PW = 0.23 (0.22-0.26); SW = 0.25 (0.23-0.28); AW = 0.28 (0.25-0.31); HL = 0.21 (0.20-0.22); EL = 0.08 (0.075-0.08); TL = 0.07 (0.065- 0.07); PL = 0.19 (0.18-0.21); SL = 0.36 (0.335-0.39); SC = 0.32 (0.30-0.36); FB = 0.76 (0.71-0.85); BL = 1.43 (1.30-1.53) mm. BODY rather conspicuously bicoloured. Head and pronotum slightly reddish dark brown, abdomen blackish dark brown, elytra medium to light brown but scutellar area broadly dark brown. Legs, mouthparts and FIGS 1-4 (1-2) Habitusofnew Thinobius species. T. injae sp. n. (1), T. paraminor sp. n. (2). (3-4) Type locality of both P. injae sp. n. and T. paraminor sp. n. ; wide view (3), close-up (4). FIGS 5-8 (5-6) Habitusofnew Thinobius species. T. schillhammeri sp. n. (5), T. shavrini sp. n. (6). (7-8) Habitats. T. schillhammeri sp. n. , type locality (7), T. shavrini sp. n. , paratype locality in Siberia (8). first two antennomeres medium to light brown, antennal articles 3-11 dark brown. All main body parts with coriaceous (or rather imbricate on abdomen and some other parts, like sides of head) microsculpture intermixed with fine and dense punctation, making body moderately lustrous; in contrast, clypeus almost unsculptured. Punctation strongest on head, on pronotum very fine, as also on elytra, indistinct on abdomen, latter being strongly microsculptured. Tergite VII not more lustrous than preceding tergites, but on the mostly unexposed tergite VIII microsculpture is faded, so shinier. Pubescence on forebody depressed, very fine, short; on abdomen even finer but somewhat longer setae plus a row of stronger and longer setae on apices of tergites. Abdominal sides and apex with a few darker, much longer and stronger, erect 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 another before posterior corner. Direction of setation on sides of head anterior, on disc mostly medial, but posterior in midline and near hind edge; on pronotal sides medial, most of disc antero-medial, midline anterior, posterior edge lateral. Posterior edge of vertex as well as middle of anterior pronotal edge with conspicuously long setae. Setation on abdomen posteriorly directed, but slightly postero-lateral on elytra. Antennae, legs and mouthparts with very short, not conspicuous setation, except for the stiff, darker bristle slightly distad from middle of each tibia and ones near apices of femora. Elytra with three long, stiff and erect lateral setae, posterior one slightly closer to middle. Head (Fig. 23) 1.15x wider than long, temples almost straight, with only a gentle curve anteriorly, but narrowly rounded on posterior part. Vertex rather flat, supraantennal prominences strongly developed, anterior edges rather shiny. Anterior border of neck not marked with groove, only by change of microsculpture. Frontoclypeal suture appearing as fine, often shinier groove and dark line connecting supraantennal tubercles, similarly darker spots situated at both sides on middle of vertex. ANTENNAE (Fig. 51) with antennomeres 4-8 moderately to strongly transverse, as opposed to terminal antennomeres (Fig. 52) with article 9 as long as broad and 10 elongate. Pronotum (Fig. 9) slightly transverse, 1.30x wider than long, not appearing wider than head, with narrowly rounded anterior and rather narrowly rounded posterior corners. Anterior margin almost straight, as also sides (parallel) with slight concavity behind middle; posterior margin strongly but not evenly arched, almost straight in outer thirds, giving pronotum a faint pentagonal feel. No consistent and characteristic impressions, but both sides of anterior half of disc gently impressed as well as sides behind middle. Pronotal marginal bead visible on posterior margin. Scutellum large, setose and very strongly sculptured (Fig. 31). ELYTRA (Fig. 10) long, one elytron more than twice as long as broad, gently curved in cross-section, parallel-sided (very little dilation posteriorly). Shoulders moderately developed. Along suture with thin marginal bead, but broader right behind scutellum. Sutural corners broadly rounded. LEGS of medium length, tarsal lobes thin but relatively long (but not reaching apex of last tarsomere), tibiae strongly fusiform, appear a lot wider in middle than at ends. Abdomen (Fig. 43) very weakly fusiform, sides more or less straight and parallel; widest at posterior 1/3, very slightly less wide than elytra at broadest point. Posterior margin of tergite VII with moderately broad palisade fringe. PRIMARY AND SECONDARY SEXUAL FEATURES: Sexes not appearing different in regular dorsal view. Posterior corners of tergite VIII (similar in both sexes) gently protruding, posterior edge otherwise straight. Male sternite VIII as in Fig. 73, tergite IX as in Fig. 74, sternite IX as in Fig. 75. Aedeagus as in Figs 76-77. ETYMOLOGY: The species is named after the city near the type locality, deliberately in the older spelling (noun in apposition). REMARKS: The male holotype has slightly larger body size than the two paratypes . However, with only three specimens known this does not allow for conclusions on possible sexual differences. This taxon belongs in the T. delicatulus group. Its aedeagal structures are very similar to the sibling species T. delicatulus Kraatz, 1857 and T. hummleri Bernhauer, 1940 . During the checking of Thinobius taxon names described from the East Palaearctic, it was discovered that the specimens Smetana identified as T. delicatulus from Mongolia ( Smetana, 1975 ) are in fact T. hummleri . The proper distinguishing features were not known at the time. Comparison of the new species to the European relatives also revealed that a pair of specimens with conspicuously transversal antennomeres (data: Romania , jud. Maramureş , Valea Vişeului, [river] Vişeu, 1.5 km S Tisa confluence, W bank, sandy shoal N hanging bridge, 360 m , from gravelly spots in sandbank, after high water, flotation (305), 47°54'04"N , 24°09'33"E , 11.VI.2007 , [leg.] Gy. Makranczy) actually belong to T. delicatulus , which confirms its occurance in Romania . Shapes of individual antennomeres turn out to be rather variable in this genus, making this character difficult to use in diagnosis. DISTRIBUTION: The species is known only from the type locality (Figs 3-4). BIONOMICS: Seems to be associated with lower rivers, more open, sunny gravelbanks. Thinobius ootsukai Naomi, 1995 Figs 11-12, 24, 37-39, 64-66, 81 Thinobius (Platyderothinophilus) ootsukai Naomi, 1995: 22 . – Herman, 2001: 1754 . TYPE MATERIAL EXAMINED: CMIC , holotype (3); “[ JAPAN : Honshu ,] Chiba Pref ; Mt. Kiyosumi ; 27.V.1990 ; I. Oostsuka col. \ Holotype ; Thinobius ootsukai ; Naomi 1995 . \ CBM - ZI; 33876 \ Holotypus ; Thinobius ; ootsukai Naomi ; ver. Makranczy, 2011 \ Thinobius ; ootsukai Naomi ; det. Makranczy , 2011” . REDESCRIPTION: Measurements (n=1): HW = 0.33; TW = 0.31; PW = 0.38; SW = 0.44; AW = 0.46; HL = 0.27; EL = 0.11; TL = 0.075; PL = 0.295; SL = 0.54; SC = 0.50; FB = 1.08; BL = 1.93 mm . BODY unicoloured. Head dark brown with only supraantennal tubercles appearing lighter. Pronotum dark brown, elytra somewhat lighter (but unicolorous) dark brown. Abdomen dark brown to blackish dark brown. Mouthparts and antennae slightly reddish dark brown, legs medium to dark brown, tarsi somewhat lighter. All main body parts with coriaceous microsculpture intermixed with fine and dense punctation, making body moderately lustrous. Punctation on head (especially anterior half of vertex) stronger, moderately deep, pronotum slightly less strong and more dense, elytra even finer and denser, on abdomen (Fig. 37) more indistinct; on tergite VII both coriaceous microsculpture and punctation fading posteriorly (as also on mostly unexposed tergite VIII), making tip of abdomen much shinier than rest. Pubescence on forebody rather depressed, short, fine and dense (on elytra the most dense), on abdomen somewhat less dense but short and extremely fine setae, FIGS 9-13 (9-10) Thinobiusinjae sp. n. ; headandpronotum (9), elytra (10). (11-12) T. ootsukai Naomi ; head and pronotum (11), eye (12). (13) T. shavrini sp. n. ; side of head. Scale bar = 0.05 mm for 12, 0.1 mmfor 9-10, 13, 0.14 mmfor 11. FIGS 14-18 (14) Thinobius shavrini sp. n. ; elytra. (15-16) T. schillhammeri sp. n. ; head and pronotum (15), side of head (16). (17) T. yabakeinis Naomi ; head and pronotum. (18) T. paraminor sp. n. ; side of head (11). Scale bar = 0.1 mm for 16, 18, 0.2 mm for 15, 0.25 mm for 14, 17. apices of tergites with a row of conspicuously long setae, abdominal sides and apex with a few darker 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. Setation on head medially directed except distinctly posterior on anterior part of vertex (a bristle on each side). Pronotal setation mostly antero-medially directed, but near posterior and side edges and at midline direction more anterior. Posterior edge of vertex as well as middle of anterior pronotal edge with rather large setae. Elytra and abdomen with posteriorly directed setae. Antennae, legs and mouthparts with very short, not conspicuous setation, except for the stiff, darker bristle around middle of each tibia and ones near apices of femora. Sides of elytra with three such stiff but inconspicuous setae distributed on side, the middle one shifted towards apex from middle. Head (Fig. 11) 1.40x wider than long, temples shorter than eyes (Fig. 12), gently curved anteriorly, narrowly rounded posteriorly. Middle of vertex with slight impression, supraantennal tubercles moderately developed. 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 moderately elongate (Fig. 39), antennomeres 4 and 6 smaller than adjacent ones and as long as broad, other antennomeres slightly elongate. Pronotum transverse, 1.40x wider than long, significantly wider than head, anterior margin almost straight, anterior corners noticeable but obtuse-angled, sides strongly arched, forming a rather unbroken arch with posterior margin, posterior angles barely marked. Pronotal midline slightly elevated, rest of middle of disc gently impressed. Pronotal marginal bead visible on posterior margin. Scutellum large, setose and dull. ELYTRA (Fig. 38) long, one elytron slightly more than twice as long as broad, gently curved in cross-section and parallel-sided (very little dilation posteriorly). Shoulders moderately developed. Along suture only with traces of marginal bead, mostly at broadly rounded sutural corners. LEGS of medium length, tarsal lobes thin but relatively long (not reaching apex of last tarsomere), tibiae slightly fusiform, appear much wider in middle than at ends. Abdomen very weakly fusiform, sides more or less straight and parallel; widest in the middle, with just about the same width as elytra at broadest point. Posterior margin of tergite VII with palisade fringe, strongly widening in middle. PRIMARY AND SECONDARY SEXUAL FEATURES: Posterior corners of tergite VIII (similar in both sexes) gently protruding (Fig. 24), posterior edge otherwise straight. Male sternite VIII as in Fig. 64, tergite IX as in Fig. 65, sternite IX as in Fig. 66. Aedeagus as in Fig. 81. REMARKS: The description also mentions one male paratype . As the holotype was received undissected, obviously the aedeagus drawing in the original description must be based on the paratype ; its whereabouts are unknown. It was neither deposited with the holotype ( CMIC ) nor with the paratypes of T. yabakeinis , of which no previously dissected male specimen was included in the available set of paratypes ( KUEC ) although an aedeagus drawing appears among the illustrations in Naomi (1995) . FIGS 19-24 (19) Thinobiusparaminor sp. n. ; pronotum. (20-22) T. shavrini sp. n. ; head (20), pronotum (21), abdominal tip, dorsal view (22). (23) T. injae sp. n. ; head. (24) T. ootsukai Naomi ; abdominal tip, dorsal view. Scale bar = 0.1 mm for 19, 23, 0.18 mm for 20-21, 24, 0.22 mm for 22. DISTRIBUTION: The species is known only from Mt. Kiyosumi ( Chiba prefecture ) in Japan (Honshu). BIONOMICS: Unknown.