2004年 第42卷 第2期：P154~161
编辑：王俊卿 朱 敏
摘要：A new eubrachythoracid arthrodire , Phymosteus liui gen. et sp. nov. , is described from theUpper Devonian (Early Famennian) Xiejingshi Formation of Shimen County , Hunan , central China. The specimen under study , a nearly complete nuchal plate , was collected from the upper part ofthe formation in association with plant fossils , such as Leptophloeum guanzhuangense and Cyclostigma hunanense , by Dr. Gen Baoyin of Institute of Botany , Chinese Academy of Sciences in 1990s.The new form is at the pachyosteomorph level of organization having a large nuchal gap and possibly referred to the Selenosteidae of aspinothoracid arthrodires. It is the first record of the aspinothroacid arthrodires from China , but whether it widens the distribution of the Selenosteidae from Europe and North America to Asia needs further fossil materials.