论文部分内容阅读
依据采自广西平果早泥盆世郁江组中部的化石材料,记述了盾皮鱼纲节甲鱼目南极鱼科的一新属、新种——小眼坡塘鱼(Potangaspis parvoculatusgen.et sp.nov.)。该新属的眶孔很小,且为颅顶甲骨片所完全包围;中点线沟发育,与眶上感觉沟、中心感觉沟和后点线沟一起共同向颈片的骨化中心辏合。系统发育分析表明新属和发现于南极洲中泥盆统的南极鱼属构成姐妹群关系,支持了南极鱼科位于节甲鱼目最基干位置的假说,同时为早埃姆斯期东冈瓦纳大陆与中国南方之间的古地理密切联系提供了新的证据。
Based on the fossil materials collected from the central part of the Yujiang Formation in the Early Devonian of Pingguo, Guangxi Province, a new genus, a new species of Potanaspis parvoculatusgen. Et sp. nov.). The new genus has a very small orbital foramina and is completely surrounded by the maxillofacial bone. The midline gully develops with the supraorbital sensation groove, the central sensory groove, and the posterior gingival valvular joint to the ossification center of the cervical disc . Phylogenetic analysis shows that the Neoclucus and the Antarctic fish found in the Antarctica, the Antarctic, form a sister group, supporting the hypothesis that the Antarctic fish family is located in the most basal position of the section Carabidae. At the same time, New evidence is provided by close ties with ancient geography in southern China.