A new genus of lance lacewings from the Middle Jurassic of Inner Mongolia, China

A new genus of lance lacewings from the Middle Jurassic of Inner Mongolia, China
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内蒙古中侏罗世的矛草蛉一新属

DOI:
10.4202/app.00691.2019
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发表时间:
2020
影响因子:
1.8
通讯作者:
Yongjie Wang
Yongjie Wang
中科院分区:
地球科学3区
文献类型:
--
作者:
Yiming Ma;Chungkun Shih;Dong Ren;Yongjie Wang

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Osmylinae的化石非常罕见,目前已知的该亚科化石只有一个属,Lithosmylus,记录于美国晚始新世Florissant组。本文报道了采自内蒙古道虎沟中侏罗统九龙山组的一个新属和两个新种:Vetosmylus tentus gen.et sp. nov.和Vetosmylus maculosus gen.et sp. nov.。在前翅上有分叉的近肋细脉;在前翅上有密集的横脉,通常形成一个完整的外级列;在后翅上,MA和MP之间的区域明显加宽,但只有一排细胞,这可能意味着在Osmylinae的进化过程中存在形态停滞。新属Vetosmylus是迄今为止第一个也是最早的中生代Osmylinae记录,增强了我们对它们早期演化阶段的理解。
Fossils of Osmylinae are rare, currently only one fossil genus of this subfamily is known, Lithosmylus which is recorded from the late Eocene Florissant Formation of USA. Herein, we report a new Osmylinae genus with two new species, Vetosmylus tentus gen. et sp. nov. and Vetosmylus maculosus gen. et sp. nov. from the Middle Jurassic Jiulongshan Formation of Daohugou Village, Inner Mongolia, China, The new genus shares many apomorphic characters with extant osmyline relatives, e.g., forked subcostal veinlets in forewing; dense cross-veins present in radial sector, usually forming one complete outer gradate series in forewing; the region between MA and MP significantly broadened in hind wing, but with only one row of cells, implying a likely morphological stasis during the evolution of Osmylinae. The new genus Vetosmylus, the first and earliest record hitherto of Osmylinae from the Mesozoic, enhances our understanding of the early stages of their evolution.
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