Ranging from 100 to 200 microns across, the width of several human hairs, these microscopic fossils are surprisingly complex and constitute almost a textbook example of a bilaterian, including the three major tissue layers (the endoderm, mesoderm and ecto
Ranging from 100 to 200 microns across, the width of several human hairs, these microscopic fossils are surprisingly complex and constitute almost a textbook example of a bilaterian, including the three major tissue layers (the endoderm, mesoderm and ecto
这些微化石的大小为100~200微米，相当于几根头发的宽度，牠们看起来出奇复杂，而且简直就像两侧对称动物的教科书般，展示了各种特徵：包括三个主要的组织层（内胚层、中胚层及外胚层，都是中学生物课本中熟悉的名词），前后连接口部与肛门的肠腔，肠腔外还围绕著成对的体腔。