Sinodorcadion chizhouensis, Wang & Xie & Wang, 2022

Wang, Ping, Xie, Guanglin & Wang, Wenkai, 2022, Description of a new species of the genus Sinodorcadion Gressitt, 1939 (Coleoptera: Cerambycidae: Lamiinae), Zootaxa 5195 (4), pp. 385-390 : 386-388

Sinodorcadion chizhouensis sp. nov.

(池州华ǫĸ牛)

( Figs 1A–B , 2A, 2C , 3A–D , 4A–B )

Description. Male: body length 6.22 mm (measured from vertex to elytral apices), humeral width 2.21 mm (measured across humeri).

Body mostly reddish brown to dark brown, with golden-yellow pubescence; head, pronotum and elytra densely punctate. Lower margin and apex of mandible black, maxillary and labial palpi dark brown with the apices yellowish. Antennomeres reddish brown or mostly light orange-brown with the apices slightly dark brown. Elytra mostly dark brown, elytral surface unevenly clothed with golden-yellow pubescence forming irregular pubescent patches. Legs dark reddish brown, darker on femora and tarsi. Ventral surface mostly reddish brown, ventrites dark brown.

Head densely punctate, frons subquadrate, slightly convex, with a well-marked longitudinal median sulcus; vertex slightly concave. Eyes coarsely faceted and deeply emarginate; gena distinctly longer than lower eye lobe. Antennae longer than body, about 1.75 times as long as body; antennomere VII surpassing elytral apex, antennal tubercles elevated, widely separated from each other; scape cylindrical, sparsely punctate; scape distinctly shorter than antennomere III, antennomere III longer than IV, about 1.41 times as long as IV, antennomeres IV–X gradually shortening, antennomere XI sharply pointed apically, nearly equal in length of V.

Pronotum slightly wider than long, length about 0.80 times as long as the maximum width, anterior margin slightly wider than posterior margin, disc convex, with coarse, deep and dense punctures. lateral tubercle small, mastoid, slightly directed upward. Scutellum triangle, sharply pointed apically.

Elytra oval, about 1.98 times as long as humeral width, widest near basal 1/5; almost parallel from basal 1/5 to middle, then slightly arcuate to apex; 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. Mesosternal process without tubercle; mesocoxal cavities opened externally to mesepimera. Abdominal ventrites without distinct punctures, first abdominal ventrite longest, apex of terminal sternite slightly emarginate.

Legs moderately long and slender, apical half of profemora with coarse, deep punctures, metafemora exceeding elytral apex, metatarsomere I slightly longer than following two segments combined. Claws divergent.

Male genitalia( Figs 3A–D ). Tergite VIII semicircle, length about 0.73 times as long as width, apical margin with sparse short setae. Tegmen slightly bent in lateral view, paramere moderately long, gently narrowed toward subacute apex, length about 1.19 times as long as width, apex with moderately dense long setae; endophallus long, mostly membranous.

Female. Unknown.

Remarks. The new species is similar to Sinodorcadion punctuscapum Xie, Shi & Wang, 2013 (type locality: Qingliangfeng, Zhejiang, China), however, it can be easily distinguished from the latter by the combination of the following characters: pronotum slightly wider, length about 0.83 times as long as the maximum width; antennae obviously longer, about 1.75 times as long as body; elytra slightly wider, about 1.98 times as long as humeral width; profemora with coarse, deep punctures; paramere more elongate, length about 1.19 times as long as width. While in S. punctuscapum , pronotum slightly elongate, length about 0.95 times as long as maximum width; antennae slightly shorter, about 1.40 times as long as body; elytra more elongate, about 2.24 times as long as humeral width, profemora without punctures; paramere slightly wider, length about 0.81 times as long as width.

Type material examined. Holotype (male), China: Anhui, Chizhou City, Xiaokeng Grand Canyon , alt. 500m, May 3, 2022, coll. by Yu Bao ; Paratype: 1 male, same data as holotype .

Distribution. China: Anhui.

Etymology. This specific name is derived from the type locality, Chizhou city, Anhui, China.

Biology. Little is known about the biology of this genus. On the basis of collection data the adults of this genus appear from May to July in broad-leaved shrubs of East China at the altitude ≥ 500 m above the sea.

Figures

FIGURES 1A–B. Habitus of Sinodorcadion chenzhouensis sp. nov. A. dorsal view; B. ventral view. Scale bar: 5 mm.

FIGURES 2A–D. Scape and profemora of Sinodorcadion spp. A. C. S. chenzhouensis sp. nov.; B, D. S. punctuscapum Xie, Shi & Wang, 2013; A–B. scape in dorsal-lateral view; C–D. profemora in lateral view.

FIGURES 3A–H. Genitalia of Sinodorcadion species. A–B, E–F. tergite VIII; C–D, G–H. Tegmen and median lobe. A, C, E, G. ventral view; B, F. dorsal view; D, H. lateral view; A–D. S. chenzhouensis sp. nov., holotype; E–H. S. punctuscapum Xie, Shi & Wang, 2013; Scale: 0.5 mm.

FIGURES 4A–D. Field observations of Sinodorcadion chenzhouensis sp. nov. at Anhui. A–B. holotype; C–D. habitat of Xiaokeng Grand Canyon (Anhui, China).