DISCOVERY OF THE MOST COMPLETE FOSSIL LEAVES OF Ctenis kaneharai Yokoyama

Some recently discovered fossil leaves of cycad (Ctenis kaneharai Yokoyama) from the Middle Jurassic Haifanggou Formation in Changlongdigou, Beipiao, Western Liaoning Province are summarily reported. This species of fossil plant was firstly described by Japanese researcher Yokoyama from the Middle Jurassic Dabao Formation of Nianzigou, Fengcheng, Eastern Liaoning. Later on, it was also found in Japan and England. However, all the previously reported specimens are some fragments of the fossil plant, so that people could not know the complete picture of the plant. The specimens reported in this paper are not only plenty in number, but also conserved intact. Undoubtedly, these fossil plants are the best conserved so far for this genus in the Middle Jurassic Yanliao Flora. The present discovery of these specimens is significantly important for the paleoecology, paleoclimatology and other researches on the Yanliao Flora in China.