Trigonocnera granulata, Ba, Yi-Bin & Ren, Guo-Dong, 2009

Ba, Yi-Bin & Ren, Guo-Dong, 2009, Taxonomy of Trigonocnera Reitter, with the description of a new species (Coleoptera, Tenebrionidae), Zootaxa 2230, pp. 51-56 : 52-54

Trigonocnera granulata sp. nov.

( Figs. 2–14 , 28 )

Type material. Holotype: ɗ, Mt. Maan, Lingwu County, Ningxia Province, China, 2 May 1987, collected by Ren Guodong. Paratypes: China: 7 ɗɗ, 10 ΨΨ, same data as holotype; 2 ɗɗ, 1 Ψ, Mt. Maan, Lingwu county, Ningxia Province, 25 August 2007; 2 ɗɗ, 3 ΨΨ, Baijitan, Lingwu county, Ningxia Province, 4 May 1987; 4 ɗɗ, 5 ΨΨ, Lingwu county, Ningxia Province, 5 May 1987; 1 ɗ, 1 Ψ, Yinchuan City, Ningxia Province, 28 May 1987; 2 ɗɗ, 2 ΨΨ, Shuxin, Qingtongxia City, Ningxia Province, 18 May 1980; 1 Ψ, Mt. Mahuang, Yanchi county, Ningxia Province, 8 July 1988; collected by Ren Guodong; 15 ɗɗ, 22 ΨΨ, Zhongning County, Ningxia Province, 15 August 2008, collected by Zhang Chengli; 6 ɗɗ, 7 ΨΨ, Wulate Qianqi, Neimenggu Province, collected by Cai Jiakun; 1 ɗ, 2 ΨΨ, Bayin, Alashan Zuoqi, Neimenggu Province, 1 May 1992; 2 ɗɗ, 1 Ψ, Alashan Zuoqi, Neimenggu Province, 2 May 1992; collected by Yu Youzhi.

Diagnosis. The new species is similar to T. pseudopimelia pseudopimelia and T. pseudopimelia reitteri . In addition to the the differences given in the key, T. granulata differs from the two subspecies of T.

pseudopimelia in the form of the aedeagus..

Etymology. The specific name is derived from the word “granula”, and refers to the densely granulate body.

Description. Body broadly oval, color shiny black. Head broad; punctures of frons sparser on middle than on sides, every one with a seta; anterior and lateral margins of clypeus straight; genae slightly arcuate, narrower than breadth between eyes. Antennae moderately short, reaching base of pronotum; 3rd segment 2.8 times as long as broad, terminal segment short, oval; relative length ratio of 2nd to 11th segments as follows: 18.0: 55.0: 32.0: 28.0: 30.0: 29.0: 26.0: 25.0: 15.0: 8.0. Mentum approximately square, anterior margin shallowly incurved.

Pronotum 1.3 times as broad as long; anterior margin straight and bordered; lateral margin arcuate, but straight near base, broadest at apical 1/3, border invisible in dorsal view; base broadly bordered; anterior angles acute, posterior angles obtuse; disc feebly convex, middle line distinct, umbilicate punctures large, larger in diameter than interspaces, with hairs, and somewhat sparse medially.

Elytra broadly oval, 1.4 times as long as broad, and 3.0 times as long as pronotum; base W – shaped, humeri round; lateral margin parallel, humeral rows obvious only on apical 2/3, granules of rows fine and dense in apical 1/2; granules of marginal rows thick on basal 1/2, and small and dense on apical 1/2, humeri densely granuliferous, similar with humeral rows; pseudopleuron sparsely granuliferous.

Propleura sparsely granuliferous and with dense hairs, prosternal process distinctly curved beyond procoxae, round and bordered apically. Mesosternum gibbous anteriorly, with even and round granules and hairs. Abdomen sparsely and finely granuliferous and with dense hairs. Aedeagus long and broad; paramera 1.3 times as long as basal piece, middle flat in dorsal view, lateral margin straight, apex triangulate; lateral margin of basal piece straight, broadest at apical 1/3, apex round. Ovipositor short and broad, valvula digitiform.

Protibiae gradually broadened to apex. Meso- and metatibiae slightly broad apically. Ratios of relative length of metatarsi 1st to 4th segments as follows: 30.0: 13.0: 12.0: 30.0.

Measurements. Body length: 16.0 – 22.0 mm; width: 8.0 – 11.0 mm.

Figures

FIGURES 2 – 14. Trigonocnera granulata sp. nov. 2. Head; 3. Pronotum; 4. Antenna; 5 – 6. Prosternal process in dorsal and lateral views; 7. Protibia; 8. Metatarsus; 9 – 11. Aedeagus in ventral, lateral and dorsal views; 12 – 13. Ovipositor in dorsal and ventral views; 14. Spiculum ventrale of male.

FIGURES 28 – 30. Trigonocnera spp. 28. T. granulata sp. nov.; 29. T. pseudopimelia pseudopimelia; 30. T. pseud. reitteri (from Medvedev, 1990).