Description of Euroleptochromus gen.n. (Coleoptera, Staphylinidae, Scydmaeninae) from Baltic amber, with discussion of biogeography and mouthpart evolution within Clidicini
Description of Euroleptochromus gen.n. (Coleoptera, Staphylinidae, Scydmaeninae) from Baltic amber, with discussion of biogeography and mouthpart evolution within Clidicini
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DOI：
10.1111/j.1365-3113.2012.00623.x
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发表时间：
2012-04
影响因子：
4.8
通讯作者：
P. Jałoszyński
中科院分区：
文献类型：
--
作者：
P. Jałoszyński
拟蚁石甲虫超族一新种--萨氏欧细光石甲虫。& sp.n.在始新世波罗的海琥珀中发现Clidicini的系统发育分析，Leptomastacini和Mastigini的代表外组类群，提供了强有力的支持姐妹组之间的关系，新热带Leptochromus和新属。Clidicini的单系性受到质疑，因为Nearctic Papusus作为Leptomastacini + [Clidicus +（Palaeoleptochromus +（Euroleptochromus + Leptochromus））]的姐妹分类单元的替代位置。分散vicariance分析提供了三种替代方案的Mastigitae的进化，与Laurasia的超部落的祖先地区，主要的分支事件发生在欧亚大陆或Laurentia和两个trans-Beringia分散在晚白垩世和始新世。Euroleptochromus，Palaeoleptochromus和Leptochromus共享postgenae和下颚须上的高度衍生结构，可能是专门的进食或猎物捕获机制的一部分。这些修改在Clidicini的形成被证明涉及一个过程（追溯到Campanian，79马）的伸长和缩小的下颚须，并形成一个表皮的感觉刚毛突起从一个扩大的插入部位。
A new extinct species of the ant-like stone beetle supertribe Mastigitae, Euroleptochromus sabathigen. & sp.n. is described from Eocene Baltic amber. A phylogenetic analysis of Clidicini, with representatives of Leptomastacini and Mastigini as out-group taxa, provided strong support for a sister-group relationship between the Neotropical Leptochromus and the new genus. The monophyly of Clidicini is questioned because of an alternative placement of Nearctic Papusus as a sister taxon to Leptomastacini + [Clidicus + (Palaeoleptochromus + (Euroleptochromus + Leptochromus))]. A dispersal-vicariance analysis provided three alternative scenarios for the evolution of Mastigitae; with Laurasia as the ancestral area of the supertribe, major branching events occurring within either Eurasia or Laurentia and two trans-Beringia dispersals in Late Cretaceous and Eocene. Euroleptochromus, Palaeoleptochromus and Leptochromus share highly derived structures on postgenae and maxillary palps, probably as part of a specialised feeding or prey capture mechanism. The formation of these modifications in Clidicini is demonstrated to involve a process (traced back to the Campanian, 79 Ma) of elongation and narrowing of maxillary palps and forming a cuticular setal projection from a broadened insertion site of sensory setae.