论文部分内容阅读
本文记述昼蜓科化石一新属新种———孟氏丽昼蜓Abrohemeroscopusmengigen .etsp .nov.。化石采自辽宁省义县早白垩世九佛堂组地层中。新属与巴依萨昼蜓HemeroscopusPritykina,1977在形态上比较相似 ,但在演化程度上更为原始 ,主要体现在下面几个方面 :(1)后翅臀套较小 ,仅有 6～ 7个翅室 ;(2 )径增脉 (Rspl)缺 ;(3)后翅CuAa脉弯曲 ,带有 5个明显的后分支 ;(4 )前翅MP脉不显短 ,终止于翅后缘近翅结处 ;(5 )翅痣下有一个明显的支脉 ;(6 )后翅CuAa和MP域基部较窄 ,在三角室下方仅有 1排翅室。这是昼蜓科化石在中国的最老记录
This article describes a new species of Fagus Dayfly a new species --- Monteggia dayfly Abrohemeroscopusmengigen.etsp. Nov .. Fossils from Yixian, Liaoning Province, Cretaceous Jiufotang formation. HemeroscopusPritykina, 1977 is similar in morphology but more primitive in evolutionary degree, mainly in the following aspects: (1) hind wings buttocks are small, only 6 to 7 Wing chamber; (2) absence of Rspl; (3) curvature of the posterior wing CuAa vein with five distinct posterior branches; (4) (5) There is an obvious branch vein under the mole; (6) The base of the CuAa and MP of the hind wing is narrow, and there is only 1 row of wing chambers below the triangle chamber. This is the oldest record of dayfly fossils in China