辽宁西部九佛堂组昼蜓化石的新发现及其地质意义  

Discovery of hemeroscopid dragonfly from Jiufotang Formation in western Liaoning and its geological implications

作　　者：刘金远 任东[2] 高春玲 程晓冬 李宁宁[3] 刘正玲[4] 

机构地区：[1]大连自然博物馆,辽宁大连116023 [2]首都师范大学生物系,北京100037 [3]青岛大学师范学院,山东青岛266071 [4]石家庄中铁三局集团二公司学校,河北石家庄050031

出　　处：《世界地质》2004年第3期209-212,219,共5页World Geology

基　　金：国家自然科学基金(30025006;30370184);北京市自然科学基金(5032003);北京市教育委员会科技发展计划重点项目(KZ200410028013)联合资助

摘　　要：发现于辽宁省义县早白垩世九佛堂组上段地层中的昼蜓化石(孟氏丽昼蜓AbrohemeroscopusmengiRen,Liu et Chen,2003)与北京西山卢尚坟组的巴依萨昼蜓(HemeroscopusbaissicusPritykina,1977)在形态上比较相似,但在演化程度上更为原始,主要体现在后翅臀套较小(仅有6～7个翅室),径增脉(Rspl)缺,后翅CuAa脉弯曲、带有5个明显的后分支,前翅MP脉短、终止于翅后缘近翅结处,翅痣下有一个明显的支脉,后翅CuAa 和MP域基部较窄、在三角室下方仅有1排翅室。据此,九佛堂组上段的地质时代定为早白垩世早期(Berriasian-Hauterivian)较为合理。A new hemeroscopid dragonfly fossil,Abrohemeroscopus mengi Ren,Liu et Chen,2003,found from the upper part of the Jiufotang Formation,Liaoning Province,northeastern China,is similar to the Hemeroscopus baissicus Pritykina,1977,and more primitive phylogenetically than H. baissicus in the following characters:① hindwing anal loop is smaller,with only 6～7 cells(plesiomorphy);② Rspl is absent(plesiomorphy);③ the hindwing vein CuAa is curved and has five distinct posterior branches(plesiomorphy);④ the forewing MP shortened,reaches the posterior wing margin slightly beyond the level of the nodus(plesiomorphy);⑤ pterostigmata more distinctly braced(plesiomorphy);⑥ the hindwing area between MP and CuAa is narrow,with only one row of cells near the discoidal triangle(plesiomorphy). These facts demonstrate that the upper part of the Jiufotang Formation should be early Early Cretaceous in age.

关 键 词：蜻蜓 昼蜓 九佛堂组 热河生物群 早白垩世 辽宁 

分 类 号：P534.53[天文地球—古生物学与地层学]