基金Supported by the Chinese National Key Project for Basic Research （Grant No. 2002CB412610）, the National Natural Science Foundation of China （Grant Nos. 40542008 and 40672012） and Chinese Geological Survey Project （Grant No. 200213000009）The corresponding author is indebted to Drs. Bob Nicoll and H. Kozur for their help. Dr. Kozur kindly provided the age of their undescribed species Mesogondolella sp. nov. Dr. Nicoll gave an affirmative answer to our identification of genus Vjalovognathus, ＂definitely, with no reservation＂（personal communication）.The authors are greatly indepted to Dr. John Repetski and Prof. R J Aldridge for critically reading the manuscript and valuable comments.
基金中国科学院资源环境领域知识创新工程重要方向性项目（KZCX2-YW-154）、国家自然科学基金（No.40772004,41072008）和中国科学院“外国专家特聘研究员”计划项目（No.200922-7）Chinese Academy of Sciences Visiting Professorship for Senior International Scientists（Grant No.200922-7）联合资助.
基金This work was supported by the Project 111 of China （B06008）, the Scien- tific Research Operating Expenses, Jilin University-the Base Platform Construction Project, the National Natural Science Foundation of China （40972001）, and RFBR No. 11-05-92692-1nd_a. We are very grateful to Prof Sun, Key-Lab for Evolution of Past Life ＆ Environment, MOE （Jilin Univ.） and Prof Dilcher, NAS, Department of Geology, Indiana University for their careful reviews of this paper as well as the anonymous reviewers for their useful comments. Thanks are extended to Prof. Zhu Huaicheng （NIGPAS） for his help in the stratigraphic column of Baode, Senior Engi- neer Huang Fengbao （NIGPAS） for her help to study cuticles, as well as Prof. Zhang Wu, Shenyang Institute of Geology ＆ Minerul Resources and Prof. Na Jie, College of Chemistry and Biology, Shenyang Normal Univer- sity for their positive suggestions in studying cuticles. Thanks go to Prof. Wang Jun, Prof Liu Lujun and Senior Engineer Mei Shengwu （NIGPAS）, Dr. Tian Ning and Bai Shuchong （PMOL）, as well as Mr. Yuan Quansheng vice director of the Nanhegou of Baode for supporting our excursion in Baode.