Sinodorcadion zenghuaae Xie & Wang, 2020

Zhao, Shuai, Xie, Guanglin & Wang, Wenkai, 2020, Two new species of the genus Sinodorcadion Gressitt, 1939 (Coleoptera: Cerambycidae: Lamiinae), Zootaxa 4768 (2), pp. 291-296 : 293-294

Sinodorcadion zenghuaae Xie & Wang sp. nov. (dzṃṃḎK+)

( Figs 5–8 , 13–16 )

Description. Male: Length 9.6 mm, humeral width 2.5 mm, maximum elytral width 3.0 mm. Body mostly black brown to black, with dense gray and black-brown pubescence. Head, pronotum and elytra densely punctate. Lower margin and apex of mandible black, maxillary and labial palpi mostly dark brown, only distal segment pale brown apically. Antennomeres dull red brown with the apices slightly dark brown except scape and pedicel nearly black. Head, scape, pedicel, antennomeres III-IV, legs and underside with dense gray pubescence; pronotum disc mostly with gray pubescence, with a short black oblique pubescent strip on each side of midline behind middle and a black longitudinal strip on either side. Scutellum with dense gray pubescence. Elytra mostly with gray pubescence, with a large black pubescent patch around scutellum of which the sides subparallel and posterior edge strongly zigzag; and a broad black median pubescent band.

Head densely punctate, frons slightly convex, with a smooth black longitudinal median sulcus extending to occiput; maxillary and labial terminal palpomere expanded and truncated apically ( Fig. 13 ). Eyes coarsely faceted, lower lobe narrow. Antennae about 1.8 times as long as body; antennal tubercles broadly separated; scape cylindrical, slightly thickened apically, with inner side with sparse shallow punctures; antennomere III longer than IV, about 1.5 times as long as scape; antennomeres IV–X gradually shorter in length, antennomere XI subequal to V. Pronotum slightly wider than long, similarly punctate as on head; anterior margin slightly wider than posterior margin, lateral margin enlarged outward in the middle; lateral tubercle conspicuous, slightly directed upward; disc strongly convex, conspicuously sloping behind middle, anterior and posteriorly with a distinct transverse sulcus. Scutellum short, lingulate. Elytra elongate, strongly and evenly convex, about 2.0 times as long as maximum elytral width; widest at middle, then gradually narrowed towards apex, apex rounded; elytral surface more sparsely and coarsely punctate than on head and pronotum, diminishing towards apex. Prosternum, mesanepisternum, and mesoventrite coarsely and shallowly punctate anteriorly; mesoventral process impunctate.

Abdominal sternites without distinct punctures, apex of terminal sternite slightly emarginate. Legs relatively long, tibiae approximately as long as femora, claws widely divergent.

Female: Length 7.0 mm, humeral width 2.0 mm, maximum elytral width 3.0 mm. Similar to male, but antennae about 1.5 times as long as body; maxillary and labial palpi with apical palpomere fusiform ( Fig. 14 ); elytra relatively short and wide, ovate, length about 1.8 times as long as maximum width; apical edge of terminal abdominal sternite nearly straight.

Material examined. Holotype (male), China: Guangxi, Jinxiu county, Changdong township , N 24°06′28.77″, E 110°11′30.25″, alt. 1246 m, June 5, 2015, coll. by Jingsheng Zhao . Paratype: one female, the same locality as the holotype, but N 24°05′42.77″, E 110°10′37.96″, alt. 1129 m, May 22, 2015.

Distribution. China: Guangxi.

Etymology. Following wishes of Mr. Tianlong He (OiKAE) who presented us with the specimens of this species, the new species is named after his mother, Ms. Zenghua Tang, to express his love and gratitude.

Comments. The new species is differentiated from the other species of the genus by the body with dense gray pubescence, the pronotum with two black oblique strip and the elytra with a big black basal patch and a broad median band.

It is the second species having the rather long antennae. Both, male and female antennae are remarkable longer than body, the ratio of antennal length to body length is 1.8 in males and 1.5 in females. It’s the third species with the scape punctate.

At first glance, the new species is similar to Elegantogyaritus wakaharai (Yamasako, Hasegawa & Ohbayashi, 2012) ( Gyaritini ) by the elytral pubescence pattern. However, the new species differs from the latter in lacking suberect long setae on body, lacking a pair of spinous tubercles on pronotal disc and mesocoxal cavities open.

Figures

FIGURES 1–8. Habitus of Sinodorcadion spp. 1–4. S. chinense Xie & Wang sp. nov. 5–8. S. zenghuaae Xie & Wang sp. nov. 1, 2, 5, 6. Holotype, male. 3, 4, 7, 8. Paratype, female.

FIGURES 9–16. Sinodorcadion spp. 9–12. S. chinense Xie & Wang sp. nov. 13–16. S. zenghuaae Xie & Wang sp. nov. 9–10. Labial palpus. 11, 15. Scape showing the sparse punctures. 12, 16. Mesoventrite. 13–14. Head in ventral view showing the maxillary and labial palpi. 9, 11–13, 15–16. Holotype, male. 10, 14. Paratype, female.