Dinoderus (Dinoderastes) nanxiheensis, Zhang & Meng & Beaver, 2022

Zhang, Yi-Feng, Meng, Ling-Zeng & Beaver, Roger A., 2022, A review of the non-lyctine powder-post beetles of Yunnan (China) with a new genus and new species (Coleoptera: Bostrichidae), Zootaxa 5091 (4), pp. 501-545 : 510-512

Dinoderus (Dinoderastes) nanxiheensis sp. nov.

Fig. 8 (A, B, C, D, E)

Type material. Holotype: CHINA: Yunnan Gulinqing Provincial Natural Reserve , 22°43′54.94″N, 103°59′39.27″E, 17.V. 2019, 594m, leg. LZ Meng ( IZAS) . Paratypes (4): as holotype except: 22°43′51.53″N, 103°59′35.34″E, 11.IV. 2019, 585m (1); as previous except: 16.vi.2019 (1); as previous except: 22°43′53.33″N, 103°59′34.97″E, 07.VI. 2019, 592m (1); as previous except: 22°43′54.94″N, 103°59′39.27″E, 01.IV. 2018, 594m (1) (all in HUC).

Description. Length 3.5–3.8 mm, 2.5 × longer than wide (n = 3), body cylindrical, elongated, black, except femora and tibiae blackish-brown, tarsi reddish-brown.

Head. Labrum sparsely punctured, shallowly concave, smooth and reflexed in middle. Epistoma narrow, its apical margin arcuately emarginate, sparse soft setae directed forwards. Frons indistinct, narrower than epistoma, with finely but distinctly micro-sculptured surface, setulae (seen only near to epistoma) directed towards middle of frons. Vertex inconspicuously wrinkled. Antennae with 10 antennomeres, the last three forming the club, penultimate segment of club transverse, last segment of subequal width and length, broadly rounded at apex. Eyes distinctly flattened, with yellowish-white, short, radially spreading setae present behind ocular margins.

Pronotum. Pronotum widest behind middle, 1.1 × wider than long (n = 3); lateral carina distinct, reaching beyond pronotal midlength and extended to join row of denticles on anterior margin; these denticles (9-10 on each side) almost evenly spaced and median two teeth widely separated, sharply triangular; those in remaining rows finer, semi-circularly distributed; basal part of pronotum with small, shallow punctures; prescutellar depressions relatively deep and conspicuous; pronotal vestiture yellowish-white, recumbent, denser only on sides and near basal angles.

Scutellar shield. Rectangular, about twice as wide as long.

Elytra. Elytra faintly shining, parallel sided, 1.5 × longer than wide (n = 3), anterior margin sharp and distinct; elytral punctures small near base, increasing in size and more closely placed towards declivity, shallow, irregularly distributed, surface between them weakly (anteriorly) to distinctly (in apical part) convex; apices of elytra invisible from above, apical margin finely crenulate; declivity with punctures similar in size and spacing to those on posterior part of elytral disc; suture distinctly raised over whole height of declivity, on either side of it a narrow, impunctate, shining groove; elytral setae very fine, hardly discernible in basal and middle parts of elytra which appear almost glabrous, distinct, erect, golden-yellow, short, and sharply pointed on declivity.

Tarsi. First tarsomere long, at least as long as the next two together, distal tarsomere somewhat shorter than the others together; ventral side of basal two tarsomeres with brushes of dense, long setae.

Diagnosis. The species belongs to the group with 10 antennomeres (see above). It is distinguished from the other species in the group by the form of the elytral declivity. The suture is raised over the whole height of the declivity, and has a narrow, impunctate, shining groove on each side.

Etymology. The species is named in reference to the type locality. All of the type specimens were collected within a small fragment of tropical monsoonal rainforest in Gulinqing Provincial Nature Reserve, belonging the Nanxihe (Nanxi River) Watershed, a tributary of the Honghe river.

Host plants. Unknown.

Distribution. China (Yunnan) only.

Figures

FIGURE 8. (A, B, C, D, E) Lateral (A), dorsal (B), posterior 45°angel (C), antennae (D) and declivity (E) views of Dinoderus (Dinoderastes) nanxiheensis sp. nov.. Total horizontal scale bar of B =1 mm.