Deinopteroloma minor Shavrin & Smetana

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 : 237-240

Deinopteroloma minor Shavrin & Smetana , sp.n.

( Figs. 3 , 12, 18, 30−31, 47, 54, 61, 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, \ EmeiShan, N 29°32ʹ57.2ʹʹ \ E103°20ʹ37.7ʹʹ, \ 16.vi.2010, 2289m, \ sifting35, V.Grebennikov ” [rectangular printed label], “ HOLOTYPE \ Deinopteroloma \ minor sp. n. \ Shavrin A.V. & Smetana A. des. 2016” [red rectangular printed label] ( NSMT) .

Paratypes (19 specimens): 5 Ƌ, 6 ♀: same data as the holotype (3 Ƌ, 4 ♀: NSMT; 2 Ƌ, 1 ♀: CSH; 1 ♀: BMNH) ; 3 Ƌ, 2 ♀: “P.R. CHINA, Sichuan, \ EmeiShan, N 29°32ʹ48.4ʹʹ \ E103°20ʹ06.3ʹʹ, \ 17.vi.2010, 2342m, \ sifting36, V.Grebennikov ” ( NSMT) ; 1 Ƌ: “P.R. CHINA, Sichuan, \ EmeiShan, N 29°33ʹ36.3ʹʹ \ E103°20ʹ38.0ʹʹ, \ 15.vi.2010, 1947m, \ sifting33, V.Grebennikov ” ( NSMT). All paratypes with additional red rectangular printed label: “ PARATYPE \ Deinopteroloma \ minor sp. n. \ Shavrin A.V. & Smetana A. des. 2016”.

Description. Measurements (n=20): HW: 0.60−0.67; HL: 0.36−0.41; OL: 0.12−0.17; AL (holotype): 1.05; PL: 0.52−0.62; PW: 1.00−1.08; ElL: 1.27−1.47; EW: 1.22−1.33; AedL: 0.61−0.63; TL: 2.13−2.67 (holotype: 2.45).

Body, mouthparts and legs yellowish brown to reddish brown, head reddish-brown to brown, with small dark brown spots on each side of clypeus above antennal insertion, elytra with variable, distinct or indistinct, brown Ushaped middle and apical maculae, some specimens only with indistinct middle macula or without it. Dorsal surface of body shiny, without microsculpture except lateral portions of clypeus with irregular transverse lines. Head (except clypeus) with very irregular deep punctation denser between ocelli, distinctly rugose and without interspaces on infraorbital ridges; disc of pronotum with large and deep very irregular punctation on middle elevation and with irregular, smaller punctation along posterior pronotal margin, sides of pronotum with sparse punctation denser in posterio-lateral portion; scutellum without or with few small indistinct punctures; punctation of elytra dense, distinctly larger and deeper than that on pronotum, disc of each elytron represented by 5−7 longitudinal rows of serial punctures, apical third of first two sutural rows of punctures and lateral punctation not serially arranged. Habitus as in Fig. 3 .

Head 1.6 times as wide as long; posterior part of clypeus and vertex with distinct irregular elevation, with posterior transverse, moderately deep impression in front of ocelli, infraorbital ridges slightly impressed between posteriolateral margins of each eye and ocellus; eyes moderately convex; small obtuse postocular ridge situated away from posterior margin of eye, distance slightly larger than twice the length of eye seen from above; ocelli moderately large, placed slightly lower than postocular ridges, distance between ocelli more than twice as large as distance between ocellus and posterior margin of eye. Antenna reaching one-third of elytral length when reclined, with thickened antennomeres; measurements of antennomeres (length/width, holotype): 1: 0.15 × 0.07; 2: 0.10 × 0.05; 3: 0.10 × 0.03; 4: 0.08 × 0.05; 5: 0.09 × 0.05; 6−8: 0.08 × 0.05; 9−10: 0.08 × 0.06; 11: 0.13 × 0.07.

Pronotum strongly transverse, 1.7−1.9 times as wide as long, 1.6 times wider than head; apical margin slightly narrower than posterior margin, anterior angles widely rounded, lateral margins with small crenulation, evenly narrowed both posteriad and anteriad, with moderately obtuse posterior angles; disc of pronotum with wide, very convex middle elevation with distinct longitudinal impression and with irregular wide impression in basal third; lateral portions of pronotum slightly reflexed, each with deep pit at middle.

Elytra very convex and short, slightly longer than wide; surface of each elytron with distinct longitudinal sutural elevation and three discal elevations more expressed in first half of elytron; latero-apical portions of each elytron slightly explanated and reflexed.

Male. First four protarsomeres slightly dilated. Front tibia vaguely dilated at about middle in lateral view. Apical margin of abdominal tergite VIII (Fig. 12) more or less straight. Apical margin of abdominal sternite VIII (Fig. 18) slightly sinuate. Aedeagus ( Fig. 30 ) very long and narrow, median lobe in apical third gradually narrowed toward acute apex; parameres extremely long, significantly exceeding apex of median lobe, slightly asymmetrical: right paramere vaguely longer, with narrow acute apex; internal sac very gentle, without visible sclerotized structures. Aedeagus laterally as in Fig. 31 .

Female. First four protarsomeres not dilated. Apical margin of abdominal tergite VIII ( Fig. 47 ) and sternite VIII ( Fig. 54 ) rounded. Genital segment as in Fig. 61 .

Differential diagnosis. Based on the combination of pale coloration of the body, the shape of lateral margins of pronotum with dense and uniform crenulation and the elytra without very convex longitudinal elevations, D. minor is similar to D. chiangi and D. emeicola sp.n., but it differs by the smaller and wider body, coloration of the elytra, and by the completely different structure of the aedeagus. Deinopteroloma minor sp.n. differs from all congeners by its smaller size, wide and oval body, by the shape of the slightly explanated and reflexed latero-apical portions of each elytron, as well as by the shape of aedeagus with short and narrow median lobe and extremely long parameres.

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

Bionomics. All specimens were taken by sifting forest floor litter at elevations from 1947 to 2342 m a.s.l.

Etymology. The specific epithet is the Latin adjective minor (smaller, inferior). It refers to the small size of the species.

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 1 – 4. Habitus of Deinopteroloma: 1 — D. bisbisinuatum (holotype), 2 — D. draco (holotype), 3 — D. minor (paratype), 4 — D. rougemonti (paratype). Scale bar: 1.0 mm.

FIGURES 30 – 35. Aedeagus of Deinopteroloma (30, 32 — parameral view, 31, 34 — lateral view) and internal sac (33 — parameral view, 35 — lateral view): 30 − 31: D. minor (paratype), 32 − 35: D. rougemonti (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.