Last major gap in scydmaenine evolution filled (Coleoptera: Staphylinidae)
Last major gap in scydmaenine evolution filled (Coleoptera: Staphylinidae)
复制标题
填补了仙甲藻进化的最后一个主要空白（鞘翅目：葡萄科）
DOI：
10.1016/j.cretres.2017.10.026
复制
发表时间：
2018-04-01
影响因子：
2.1
通讯作者：
Huang, Diying
中科院分区：
文献类型：
--
作者：
Yin, Ziwei;Cai, Chenyang;Huang, Diying
Scydmaenini部落是蚂蚁类石甲虫（Scydmaeninae）中最成功的现代类群之一，显示出高度的物种多样性（约750种）和形态差异。令人惊讶的是，直接的化石证据对于阐明Scydmaenini的起源和早期进化至关重要。这一知识缺口尤其令人感兴趣，因为其他主要的锡达曼系的白垩纪起源，例如，Mastigini, Eutheiini， Cephenniini和Clandulariini，最近被记录下来。本文报道了白垩纪缅甸琥珀的新属和新种Kuaju borealis gen. et sp. nov.，将最早的茎群Scydmaenini的确定记录推后至大约99 Ma。这一新分类群与最近的Scydmaenini有密切的关系，这可以从其短而圆顶状的末端（第四个）上颌端柄和一个暴露的后端柄得到强有力的支持，这是该部落的典型特征状态。然而，夸富在景观的前缘具有一种未缺口的近形特征，这在现存的Scydmaenini中是未知的，表明化石分类单元的基础位置。我们的发现提供了确凿的证据，表明茎群Scydmaenini，像其他主要的Scydmaenini谱系一样，起源于不晚于白垩纪中期，排除了Scydmaenini可能有一个年轻的第四纪起源的可能性。(C) 2017 Elsevier Ltd.版权所有。
The tribe Scydmaenini represents one of the most successful modern groups of the ant-like stone beetles (Scydmaeninae), displaying a high degree of species diversity (>750 species) and morphological disparity. Surprisingly, direct fossil evidence crucial for elucidating the origin and early evolution of Scydmaenini is lacking. This gap of knowledge is of particular interest as the Cretaceous origin of other major scydmaenine lineages, e.g., Mastigini, Eutheiini, Cephenniini, and Clandulariini, were recently documented. Here, we report a new genus and species, Kuaju borealis gen. et sp. nov., from Cretaceous Burmese amber, pushing back the oldest definitive record of stem-group Scydmaenini to approximately 99 Ma. An affinity of the new taxon with recent Scydmaenini is strongly supported by the beetle's short, dome-like terminal (fourth) maxillary palpomeres, as well as an exposed metanepimera which are typical character states of the tribe. However, Kuafu possesses a plesiomorphic un-notched anterior margin of the scape, a character state unknown among living Scydmaenini, and suggesting a basal position of the fossil taxon. Our find provides firm evidence that stem-group Scydmaenini, like other major scydmaenine lineages, originated no later than the mid-Cretaceous, removing the possibility that Scydmaenini may had a young, Quaternary origin. (C) 2017 Elsevier Ltd. All rights reserved.