Deinopteroloma sextuberculatum Smetana & Shavrin

Smetana, Aleš, 2016, Nine new species of the genus Deinopteroloma Jansson, 1946 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini) from China and Vietnam, Zootaxa 4196 (2), pp. 221-249 : 243-245

Deinopteroloma sextuberculatum Smetana & Shavrin , sp.n.

( Figs. 7 , 14, 20, 36−39, 49, 56, 63, 65−66)

Type material examined: Holotype Ƌ [plastic plate with aedeagus and apical abdominal segment in Canadian balsam was pinned under the plate with beetle]: “P.R. CHINA, Sichuan, \ Emei Shan, N 29°33ʹ04ʹʹ \ E103°21ʹ19ʹʹ, 25.v.2011 . \ 1729m, \ sift05, V.Grebennikov” [rectangular printed label], “HOLOTYPE \ Deinopteroloma \ sextuberculatum sp. n. \ Smetana A. & Shavrin A.V. des. 2016” [red rectangular printed label] (NSMT).

Paratypes (10 specimens): 8 Ƌ [1 specimen without right and 1 specimen without left elytron], 2 ♀ [1 specimen without right antenna]: “P.R. China, Sichuan, \ Emei Shan, N 29°33ʹ00ʹʹ \ E103°21ʹ38ʹʹ, 28.v.2011 . \ 1639m, \ sift08, V.Grebennikov” [rectangular printed label] (6 Ƌ, 2 ♀: NSMT, 2 Ƌ: CSH). All paratypes with additional red rectangular printed label: “PARATYPE \ Deinopteroloma \ sextuberculatum sp. n. \ Smetana A. & Shavrin A.V. des. 2016”.

Description. Measurements (n=11): HW: 0.90−1.00; HL: 0.55−0.69; OL: 0.25−0.28; AL (holotype): 1.88; PL: 0.80−0.95; PW: 1.40−1.50; ElL: 2.55−3.00; EW: 1.85−2.00; AedL: 1.45−1.55; TL: 4.25−4.92 (holotype: 4.35).

Body yellowish brown to reddish brown; lateral sides of pronotum and sometimes scutellum, sutural elevation of elytra, convex subhumeral tubercles and six tubercles about middle of elytra yellow to yellowish brown; antennae and legs rufotestaceous, tarsi and antennomeres 1−4 yellow. Dorsal surface of body very shiny, without microsculpture except some specimens with very indistinct rudiments of transverse lines on clypeus. Head with very sparse, small and deep irregular punctation, denser on infraorbital ridges and between ocelli; disc of pronotum on middle elevation with coarse, irregular punctation, denser along posterior pronotal margin and sparser on lateral sides of pronotum; scutellum without punctures; each elytron with sutural stria represented by a row of serial punctures along suture, with five more or less regular longitudinal rows of coarse punctures becoming not serially arranged toward apex (first two rows near suture not serially arranged in basal fourth of elytra), lateral parts of each elytron with dense, not serial punctation. Habitus as in Fig. 7 .

Head 1.4−1.6 times as wide as long; posterior part of clypeus and vertex slightly elevated, with indistinct lateral impressions in middle part and semicircular deep impression in front of ocelli, infraorbital ridges slightly impressed; eyes large and convex; small acute postocular ridge situated away from posterior margin of eye, distance about one third of length of eye seen from above; ocelli large, situated on same level with posterior ridges, distance between ocelli about twice as long as distance between ocellus and posterior margin of eye. Antenna reaching one-third of elytral length when reclined; measurements of antennomeres (length/width): 1: 0.27 × 0.10; 2: 0.15 × 0.05; 3: 0.17 × 0.03; 4−6: 0.16 × 0.05; 7: 0.16 × 0.06; 8: 0.15 × 0.06; 9−10: 0.15 × 0.07; 11: 0.20 × 0.07.

Pronotum transverse, 1.5−1.7 times as wide as long, considerably wider than head, with moderately strong constriction before posterior angles; apical margin of almost the same width as posterior margin, distinctly emarginated; anterior angles with smooth latero-apical tooth, lateral margins more narrowed posteriad than apicad, with crenulation coarser in middle part, with moderately large tooth in front of acute postero-lateral angles; disc of pronotum with irregular middle elevation, with distinct or indistinct impression in middle part and with indistinct, semicircular trasverse impression in basal third of pronotum; lateral portions of pronotum explanate and reflexed, each with very deep pit at middle.

Elytra elongated, about twice as long as wide; surface of each elytron with indistinct, irregular longitudinal elevations between punctures in apical third, with small narrow tubercle beside shoulders and with three small elongated tubercles in about middle part.

Male. First four protarsomeres vaguely dilated. Front tibia impressed ventrally in apical half, widely dilated about middle in lateral view, with longitudinal rows of bulbose setae. Apical margin of abdominal tergite VIII (Fig. 14) more or less straight. Apical margin of abdominal sternite VIII (Fig. 20) slightly sinuate. Aedeagus ( Fig. 36 ) narrow, very long, median lobe in apical third gradually narrowed toward rounded apex; parameres long, exceeding apex of median lobe, each narrowed in apical third toward horn-like curved, small rounded apex; internal sac ( Fig. 37 ) long, complicated, with paired characteristic parallel structures in middle and apical parts. Aedeagus laterally as in Fig. 38 .

Female. First four segments of front tarsus not dilated. Front tibia simple, without modification. Apical margins of abdominal tergite VIII ( Fig. 49 ) and sernite VIII ( Fig. 56 ) rounded. Genital segment as in Fig. 63 .

Differential diagnosis. Based on the combination of strongly crenulated lateral margins of the pronotum, on the presence of indistinct longitudinal ridges and tubercles on the elytra and on the general shape of the aedeagus with curved apices (best seen laterally) of parameres, D. sextuberculatum sp.n. is similar to Chinese D. hamatum and D. tricuspidatum , both known from Fujian ( Smetana 1996), but it differs by the absence of elytral protuberances, by the paler coloration of the body and by the details of the shape and internal structures of the aedeagus.

Distribution. The new species is known from two locations in the Emei Shan range ( Figs. 65−66 ) in Sichuan, China.

Bionomics. All specimens were taken by sifting forest floor litter at elevations from 1639 to 1729 m a.s.l. Etymology. The specific epithet is the combination of Latin numeral sex (six) and the adjective tuberculatus,- a,-um (bearing tubercles). It refers to the presence of tubercles on the elytra.

Figures

FIGURES 65. Distribution of Deinopteroloma: D. bisbisinuatum (black circle), D. draco (white circle), D. emeicola (black square), D. minor (white square), D. rougemonti (black triangle), D. ruzickai (white triangle), D. sextuberculatum (black star), D. vesiculosum (white star), D. yinyang (white rhomb). Rectangular are shown in more detail in Fig. 66.

FIGURE 66. Distribution of Deinopteroloma in Emei Shan Mts., China (detail of rectangle in Fig. 65): D. emeicola (black circle), D. minor (white circle), D. ruzickai (black triangle), D. sextuberculatum, D. yinyang (white rhomb).

FIGURES 6 – 9. Habitus of Deinopteroloma: 6 — D. ruzickai (holotype), 7 — D. sextuberculatum (paratype), 8 — D. vesiculosum (holotype), 9 — D. yinyang (holotype). Scale bar: 1.0 mm.

FIGURES 36 – 43. Aedeagus of Deinopteroloma (36, 40 — parameral view, 38, 42 — lateral view) and internal sac (37, 41 — parameral view, 39, 43 — lateral view): 36 − 39: D. sextuberculatum (paratype), 40 − 43: D. vesiculosum (holotype). Scale bar: 0.2 mm.

FIGURES 44 – 57. Female abdominal tergite VIII (Figs. 44 − 50) and sternite VIII (Figs. 51 − 57) of Deinopteroloma: 44, 51 — D. bisbisinuatum, 45, 52 — D. draco, 46, 53 — D. emeicola, 47, 54 — D. minor, 48, 55 — D. ruzickai, 49, 56 — D. sextuberculatum, 50, 57 — D. yinyang. Scale bar: 0.2 mm.

FIGURES 58 – 64. Female genital segment of Deinopteroloma: 58 — D. bisbisinuatum, 59 — D. draco, 60 — D. emeicola, 61 — D. minor, 62 — D. ruzickai, 63 — D. sextuberculatum 64 — D. yinyang. Scale bar: 0.2 mm.