江西崇义地区上泥盆统节甲类(Arthrodira)的新材料

我国泥盆系鱼化石非常丰富,尤其是下、中泥盆统。但是,上泥盆统鱼化石发现尚少,而且主要是胴甲类化石,节甲类化石则很少发现。潘江（１９６２）在对斯行健已记述的一植物化石 Ｃｈａｎｇｙａｎｏｐｈｙｔｏｎ ｈｏｐｅｉｅｎｓｉｓ Ｓｚｅ重新进行观察时认为,该化石应属于盾皮鱼类,并将其归人瓣甲类 Ｍａｃｒｏｐｔｅｔａｌｉｃｈｔｈｙｉｄａｅ（？）,化石仅包括前腹侧片和胸棘。 Ｄｅｎｉｓｏｎ（１９７８）根据潘江的文章和插图则认为, Ｃｈａｎｇｙａｎｏｐｈｙｔｏｎ ｈｕｐｅｉｅｎｓｉｓ属于原始节甲类或者瓣甲类。王念忠等…

NEW MATERIAL OF ARTHRODIRA FROM UPPER DEVONIAN OF JIANGXI PROVINCE, CHINA

A new genus and species of Arthrodira described in this paper was collected from the Upper Devonian of Chongyi, Jiangxi Province, China The characters of the new genus and species includes the anterior division of the inferognathal toothed and equal to the posterior non-biting division of the inferogathal. The biting division with anterior and posterior dental fields, anterior dental field carrying a front "tooth" which lower than other biting division; the posterior dental field with a posterior row of five teeth on posterodorsal part of the biting division of the inferognathal that stands vertically. The edentulous area concave slightly. New genus and species, Gannanichthys chongyiensis gen. et sp. nov. is erected only by two plates: the inferognathal and anterior lateral plate. It is the first Arthrodira unearthed from UPper Devonian of Jiangxi Province. The Chongyi fossil has provided scientific basis for comparing the stratigraphy and studying paleogeography. The present genus and species is similar to Dinichthys, Dunkleosteus, Eastmansteus and Gorgonichthys in shape of inferognathal, but it differs from them in the smaller size, the front "tooth" lower than other biting division, the cusp of small denticles stands vertically and the edentulous area concave slightly, and in the latters the anterior part of ventral margin of the biting division not protruding downward into a ventral process. The anterior lateral plate of the new material is very similar to Hardrosteus and Parabelosteus in shape, but the new material differs from them in the smaller size, and dorsal blade longer and ventral blade shorter. The material described is housed in the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences.