We present the first parsimony analysis of the agnathan subclass Galeaspida based on the analysis of 53 morphological ch......

记述了产于云南文山古木早泥盆世坡松冲组华南鱼类大窗鱼一新种--长矛大窗鱼(Macrothyraspis longilanceussp.nov.).新种头甲呈头......

基于对53个形态学特征的讨论，首次开展了无颌类盔甲鱼亚纲的简约性分析，获得了3个最简约的分支图，其步长为126，一致性指数为0．508，保留指......