A new coptoclavid larva (Coleoptera: Adephaga: Dytiscoidea) from the Middle Jurassic of China, and its phylogenetic implication

A new coptoclavid larva (Coleoptera: Adephaga: Dytiscoidea) from the Middle Jurassic of China, and its phylogenetic implication
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中国中侏罗世一新的鞘翅目幼虫(鞘翅目:甲虫:龙虱总科)及其系统发育意义

DOI:
10.1134/s0031030109060082
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发表时间:
2009-12
影响因子:
0.6
通讯作者:
Wang, B.
Wang, B.
中科院分区:
地球科学4区
文献类型:
--
作者:
Ponomarenko, A. G.;Zhang, H-Ch.;Wang, B.

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本文描述了采自中国东北道虎沟侏罗纪的67具幼虫化石中的一新属新种--道虎沟甲虫(Daohugounectes acetivus)。它不同于其他coptoclavids在以下特征的组合:鼻侧叶存在;腿相对较短,与跗骨平和轻微扩张;腹部terterpellum VIII几乎圆形;腹节IX的衍生物存在; urogomphi短;和气管的螺旋增厚弱。大多数这些功能是plesiomorphic的家庭Coptoclavidae和超家庭Dytiscoidea。在Dytiscoids中,腹节IX的衍生物仅存在于最近发现的遗迹家族Aspidytidae的幼虫中。
Daohugounectes primitivus, a new genus and species of coptoclavid beetles, is described from 67 fossil larvae from the Jurassic locality of Daohugou, northeastern China. It differs from other coptoclavids in the combination of the following characters: lateral lobes of nasale present; legs relatively short, with tarsi flat and slightly dilated; abdominal tergite VIII almost circular; derivative of abdominal segment IX present; urogomphi short; and helical thickening of tracheae weak. Most of these features are plesiomorphic for the family Coptoclavidae and the superfamily Dytiscoidea. Among dytiscoids, a derivative of abdominal segment IX is present only in the larvae of the recently discovered relic family Aspidytidae.
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