作者：刘时藩

摘要：Some isolated plates of Arthrodira described here were found from Lower Devonian system of Lujing, Guangxi Province, China. They conclude four spinal bodies belonging to Asiacanthus multituberculatus; three median dorsal plates and an anterior ventro-lateral plate referred to Actinolepidae indet, as well as other four indeterminate spinal bodies.
    Denison E. (1978) suggested that the Asiacanthus had been originally referred to acanthodiams, but the ornament shows more similarity to that of the spinal plates of some Placodermi. The feature displaied by the new specimens also suggests that the Asiacanthus should be referred undoubtedly to Arthrodira because the lateral borders of spinal bordy attach to the anterior lateral plate and anterior ventro-lateral plate respectively in a simple harmonic suture, while anterior lateral plate and the anterior ventro-lateral plate do not occur in acanthodians.
    There are a lot of Arthrodira fossils in the base of Nakaoling Formation, most of which belong to Actinolepidae. These fossils mainly appear in Siegenian in Europe and North America.  The circumstance seems to show that the Nakaoling Formation is of Siegenian.

卷期：20卷 02期

相关附件下载：广西景节甲鱼化石