Hao HUANG 黄灏, Chang-Chin CHEN 陈常卿 & Cheng-Ming XIAO 萧成铭

Abstract: Dorcus zhaoyangi sp. nov. is described from Zhari, Longzi, southern Xizang, China. The new species is sister to and allopatric with D. cuonaensis Huang & Chen, 2013, but can be distinguished from the latter by the following characters: relatively longer tibiae in similarly sized males; smoother and less punctate elytral surfaces around the suture in small-sized males and females; a wider non-pigmented medial patch on the last tergite in both sexes; a longer flagellum (permanently everted internal sac) in the male genitalia; a longer median lobe of the aedeagus; and a completely pigmented caudal ventral lobe of the basal piece. The Kimura 2-parameter distance in the barcode fragment of the mitochondrial COI gene (658 bp) between the two species exceeds 0.10, which is markedly larger than the distances observed among several well-accepted species within the genus. Additionally, on the mtDNA COI tree, the divergence between Dorcus zhaoyangi sp. nov. and D. cuonaensis is significantly greater than that among populations of D. cuonaensis from different localities.

Keywords: China, Dorcus, Lucanidae, new species

摘要：本文记述了采自中国西藏南部隆子县扎日地区的Dorcus zhaoyangi sp. nov.（昭阳大锹）新种。该新种与D. cuonaensis Huang & Chen, 2013（错那大锹）互为姊妹种，呈异域分布，但可通过以下特征与后者区分：在体型相近的雄性个体中，胫节相对较长；小型雄性和雌性的鞘翅缝周围表面较光滑、刻点较稀疏；两性最后一节背板上的中部无色斑块较宽；雄性外生殖器之外翻囊较长；阳茎中叶较长；以及阳茎基片后腹突完整无分裂。两物种线粒体COI基因条形码片段（658 bp）的Kimura双参数距离大于0.10，显著大于该属内一些公认物种间的距离。此外，在线粒体COI基因树上，这两个物种之间的遗传分化明显大于D. cuonaensis不同地理种群之间的分化程度。

关键词：中国，大锹属，锹甲科，新种

Published online: 2026-03-27 15:27:52

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