副蝎蛉科化石(昆虫纲长翅目)在中国首次发现(英文)

First discovery of fossil Parachoristidae (Insecta: Mecoptera) in China

报道了华夏三叠副蝎蛉Triasoparac horistahuaxiaensis gen.etspnov.(T2t)、吐孜沟准噶尔蝎蛉Junggarochorista tuzigouensis Hong.nom.nov.(J1b)和1个新转移属——冀北直脉蝎蛉属Jibeiorthophlebia Hoing,1983(transl.nov.)(J2)及其2个种J.xiao-fangzhangziensis Hong,1983(transl.nov.)、J.internata Hong,1983(transl.nov.)在中国首次发现。根据它们的脉序特征,在分类上应当归于Parachoristidae Tillyard,1937。这个科既具有二叠蝎蛉科(Permochoristidae)MP带6支脉的特征,又有直脉蝎蛉科(Or-thophlebiidae)Rs1至少带3支脉呈扇形排列的特征,形成二叠蝎蛉科和直脉蝎蛉科之间的一种独特的过渡特征的中间类群,这个类群对它们之间的演变关系的研究有重要意义。副蝎蛉科化石在中国的发现很有意义:①填补了中国中三叠世、早侏罗世、中侏罗世副蝎蛉科的空白;②可以帮助我们追溯副蝎蛉科、直脉蝎蛉科和二叠蝎蛉科之间在不同地质背景中的演变关系;③关于中侏罗世燕辽生物群及其有关问题,笔者曾先后指出,燕辽生物群(YanliaoBiota)(J2)和热河生物群(K1)均起源于华北古陆(North China Paleocontinent),燕辽地区(覆盖了新增加的内蒙古宁城地区)是它们的起源中心,尔后向外扩散与迁移,并向北覆盖到蒙古东部、俄罗斯外贝加尔等地区,形成东亚古陆(Eastern Asian Paleocontinent)中一个广阔的燕辽生物群和热河生物群的区系;④讨论了宁城地区地层层位的归属问题。

Triasoparachorista huaxiaensis gen. et sp. nov.（T2）, Junggaarochorista tuzigouensis Hong nom nov. （J1） and a transfered old genus with two species, Jibeiorthophlebia xiaofanzhangziensis Hong, 1983 and J. internata Hong, 1983 （J2） are firstly discovered in China. According to wing venational features, these genera and species should be referred to family Parachoristidae Tillyard, 1937. The main features of Parachoristidae mixed both features of the Orthophlebiidae in the Rs1 with at least 2 （Protorthophlebia）-3 （Orthophlebia） or more pectinate branches, and of the Permochoristidae in the MP with 6 branches. It formed a unique intermediate group between Orthophlebiidae and Permochoristidae , and it is different from them, meanwhile its venational features can be distin- guished in ＂Dinopanorpidae＂ Carpenter, 1972. The discovery of fossil Parachoristidae in China has certain significances, firstly it fills the gap of the field of Parachoristidae in the Midtriassic, Early Jurassic and Midjurassic of China. Secondly, In the meantime it can be used to trace the evolutionary relationship of this family in various geological age, especially to the study on the evolutionary relation- ship between Permochoristidae and Orthophlebiidae from the Late Paleozoic to Early Mesozoic. Thirdly, the author reported that the Yanliao Biota （J2） and Jehol Biota （K1） dervided from North China Palaeocontinent. Yanliao region is the origin center of Yaoliao Bio- ta and Jehol Biota, and then they migrated outwards to eastern Mongolia and arrived Zabaikalia of Russia, and formed widely a faunal province of Yanliao Biota and Jehol Biota in the Eastoasian Paleocontinent. Fourthly, the problem on the exact horizon of Ningcheng strata is discussed in this paper.