A new Chinese Cyclogethes pollen beetle, with an updated key to species of the genus and notes on its phylogenetic positioning (Coleoptera: Nitidulidae: Meligethinae)
A new Chinese Cyclogethes pollen beetle, with an updated key to species of the genus and notes on its phylogenetic positioning (Coleoptera: Nitidulidae: Meligethinae)
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DOI：
10.11646/zootaxa.5406.2.8
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发表时间：
2024-02-05
期刊：
影响因子：
0.9
通讯作者：
Sabatelli，Simone
中科院分区：
文献类型：
--
作者：
Liu，Meike;Wang，Xinyue;Sabatelli，Simone
圆环藻属一新种，新种为圆环藻C.tibialissp.Nov.，采自云南西南部的中国。新种似乎在形态上与这个基本上是东方的属的其他已知成员相当孤立(包括来自北印度次大陆、北印度支那和中国西南部的六个种)。然而，它可能与来自印度北部、印度支那和中国西南部的C.abomis KirejtShuk(1979)以及来自印度北部和尼泊尔的C.aldridgei KirejtShuk(1980)更近的亲缘关系，从那里它很容易通过更拉长的身体形状和在两性中明显具深波状的后胫骨而区分开来(在梅利吉亚科中一种非常不寻常的特征状态，其中只有一些种的雄性在胫骨形状上表现出性次级特征)。新种还与该属的其他已知分类群不同，其雄性和雌性生殖器的形状也不同。到目前为止，环草属成员的幼虫寄主植物尚不清楚，尽管一些线索，也涉及这里描述的新种，可能表明与菊科的小乔木或灌木有关。初步的和不完整的分子数据似乎与环藻属在一个支系中的系统发育定位一致，该支系包括非洲的Tarchonanthogetes Audisio&Cline属，其近缘的热带分类群，以及古北界的Maliethes Stephens，1830和Brassicogethes Audisio&Cline，2009。文章包括该属所有六个已知物种的最新识别检索表和它们已知地理分布的最新地图。
A peculiar new species of the genus Cyclogethes Kirejtshuk, 1979, C. tibialis sp. nov., is described from Southwestern China (Yunnan). The new species appears to be morphologically rather isolated from the other known members of this essentially Oriental genus (including half a dozen species from Northern Indian subcontinent, Northern Indochina, and Southwestern China). However, it could be more closely related to C. abnormis Kirejtshuk, 1979 from Northern India, Indochina, and Southwestern China, and to C. aldridgei Kirejtshuk, 1980 from Northern India and Nepal, from which it is easily distinguished by the more elongate body shape, and by the markedly sinuate hind tibiae in both sexes (a very unusual character state in Meligethinae, where only males of some species exhibit sexual secondary characters in the tibial shape). The new species also differs from other known taxa of the genus by the shape of the male and female genitalia. The larval hostplants of members of Cyclogethes are thus far unknown, although some clues, also involving the new species described herein, may suggest a relationship with small trees or shrubs of the family Asteraceae. Preliminary and incomplete molecular data on a studied member of the genus (C. abnormis) seems to not disagree with a phylogenetic positioning of Cyclogethes in a clade including the African genera Tarchonanthogethes Audisio & Cline, 2009, its allied Afrotropical taxa, and the Palaearctic genera Meligethes Stephens, 1830 and Brassicogethes Audisio & Cline, 2009. The article includes an updated identification key for all six known species of this genus and an updated map of their known geographic distribution.