Itagonia tuberculata, Shi, Ai-Min, Yuan, Shi-Bin & Wu, Chun-Lian, 2010

Shi, Ai-Min, Yuan, Shi-Bin & Wu, Chun-Lian, 2010, Three new species of Itagonia Reitter, 1887 (Coleoptera, Tenebrionidae: Blaptini) from Sichuan, China, Zootaxa 2573, pp. 57-68: 58-61

publication ID

http://doi.org/ 10.5281/zenodo.197440

persistent identifier

http://treatment.plazi.org/id/03A3879B-CE36-2B41-7C91-F9A9383CFE81

treatment provided by

Plazi

scientific name

Itagonia tuberculata
status

sp. nov.

Itagonia tuberculata   , sp. nov.

( Figs. 11 –23 View FIGURES 11 – 23 , 57– 58 View FIGURES 57 – 60. 57 – 58 )

Type material. Holotype: ɗ, CHINA: Sichuan, Xiangcheng, 28 º 56 ' N, 99 º 48 ' E, 3000 m, 16 Aug. 2009, collected by Ai-min Shi and Shi-bin Yuan ( MCWNU). Paratypes: 6 ɗɗ and 4 ΨΨ, same data as the holotype ( MCWNU); 1 ɗ, same data as the holotype but Litang, 29 º 59 ' N, 100 º 16 ' E, 4000 m, 18 Aug. 2009 ( MCWNU).

Diagnosis. The new species belongs to the group including also Itagonia Bisetosa Medvedev   , I. trisetosa Medvedev   and I. mera Medvedev. Representatives   of this group differ from other Itagonia   species in their parameres which are flat, smoothly tapering from base to apex, forming no sharp narrowing in the apical part ( Figs. 62 View FIGURES 61 – 64. 61 – 62 , 77, 83 in Medvedev, 1998 and Fig. 16 View FIGURES 11 – 23 ) and ending in acute apex in lateral view ( Figs. 61 View FIGURES 61 – 64. 61 – 62 , 78, 82 in Medvedev, 1998 and Fig. 18 View FIGURES 11 – 23 ). Occurring together with I. bisetosa   , I. trisetosa   and I. mera   , I. tuberculata   , sp.

nov. can be distinguished by pronotum widest immediately before the base; elytral surface coarse, with irregular prominences and sparse punctures; less than anterior 1 / 2 and apical part of outer margin of epipleura visible from above. Also, the described species sharply differs from I. trisetosa   and I. mera   in the presence of hair brushes on ventral surface of protarsomeres only 1 and 2 (not 1 to 3), and from I. bisetosa   (9.2–10.2 mm long) in significantly larger size.

Etymology. Named after the elytral surface with irregular prominences.

Description. Body black, indistinctly shining.

Male ( Figs 11, 13– 20 View FIGURES 11 – 23 ). Anterior margin of clypeus slightly sinuate. Lateral margin of head with obtuseangled shallow incision above antennal base. Outer genal margin arcuately converging to clypeal base. Vertex with uniform punctures. Frontoclypeal suture weak. Antennae ( Fig. 11 View FIGURES 11 – 23 ) long, when posteriorly extended, reaching nearly as far as pronotal base. Length (width) ratio of antennomeres 2 to 11 as follows: 13 (10): 34 (11): 16 (11): 15 (11): 15 (11): 17 (11): 15 (15): 14 (16): 14 (16): 20 (16).

Pronotum ( Fig. 13 View FIGURES 11 – 23 ) bell-shaped, 1.25–1.38 (1.32, on average, n= 8) times as wide as long, widest immediately before the base, 1.76–1.91 (1.86, on average, n= 8) times as wide as head. Ratio of pronotal width at anterior margin to its maximum width (n= 8) 0.52: 1.00, on average. Lateral margins of pronotum arcuately converging to anterior margin in anterior half, slightly dilated to base, finely bordered along entire length. Anterior margin of pronotum weakly sinuate and base straight, both bordered laterally. Anterior angles of pronotum obtuse; posterior ones nearly rectangular, both rounded apically. Pronotal surface between lateral margins convex, with clear punctures fine at disc center and larger laterally, median depression obscure or clear. Propleura with short wrinkles and very sparse granules. Prosternum in front of procoxae steeply sloping; intercoxal process of prosternum with shallow median depression, steeply sloping behind procoxae.

Elytra ovate, 1.21–1.32 (1.28, on average, n= 8) times as long as wide, widest before the middle, 1.31–1.40 (1.37, on average, n= 8) times as wide as pronotum. Less than anterior 1 / 2 and apical part of outer margin of epipleura visible from above. Elytral surface between outer margin of epipleura and sutural margin slightly convex and coarse, with irregular prominences and very sparse punctures. Epipleura surface smooth, with fine wrinkles and very sparse granules. Visible abdominal sternites with punctures and brown setae, 1 to 3 visible abdominal sternites with longitudinal wrinkles.

Legs robust, length (width) ratio of pro-, meso- and metafemora 72 (25): 83 (22): 100 (23); that of corresponding tibiae: 70 (11): 70 (12): 87 (16). Upper edge of inner surface of profemur ( Fig. 14 View FIGURES 11 – 23 ) with massive arcuate prominence near apex. Protibiae with massive upper spur at apical margin longer than protarsomere 1, lower spur fine and pointed. Ventral surface of protarsomeres 1 and 2 and mesotarsomere 1 with hair brushes. Mesofemur and mesotibiae as in Fig. 15 View FIGURES 11 – 23 . Metatibiae weakly incurved. Length (width) ratio of metatarsomeres 1 to 4 as follows: 24 (6.7): 13 (6.2): 12 (6.2): 20 (6.0).

Aedeagus ( Figs 16–18 View FIGURES 11 – 23 ): length 2.17 mm, width 0.58 mm. Parameres 0.67 mm long and 0.46 mm wide, with outer margins smoothly converging from base to apex. Spiculum gastrale as in Fig. 19 View FIGURES 11 – 23 . Apical margin of abdominal inner sternite 8 sinuate ( Fig. 20 View FIGURES 11 – 23 ).

Female ( Figs 12, 21– 23 View FIGURES 11 – 23 ). Body wider. Antennae ( Fig. 12 View FIGURES 11 – 23 ) shorter than in male. Upper spur of fore tibiae massive and rounded apically; lower spur missing. Ventral surface of pro- and mesotarsomeres without hair brushes. Ovipositor as in Figs 21–22 View FIGURES 11 – 23 . Spiculum ventrale as in Fig. 23 View FIGURES 11 – 23 .

Measurements. Male body length 10.6–11.5 mm, width 5.7–6.2 mm; female body length 11.1–11.7 mm, width 6.3–6.7 mm.

Distribution. China: Sichuan (Xiangcheng, Litang).