Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, B-17, Yokohama 226-8501, Japan.
Evol Dev. 2012 Sep-Oct;14(5):412-20. doi: 10.1111/j.1525-142X.2012.00561.x.
The origin of paired fins has long been a focus of both paleontologists and developmental biologists. Fossil records indicate that the first pair of fin-like structures emerged in the body wall of early vertebrates. However, extant agnathan lampreys and hagfishes lack paired fins, and thus it has been difficult to determine the developmental processes underlying the ancestral acquisition of paired fins in vertebrates. Fortunately, recent advances in our knowledge of the developmental mechanisms of the lateral plate mesoderm among different taxa have provided clues for understanding the evolutionary origin of vertebrate paired appendages.
成对附肢的起源一直是古生物学家和发育生物学家关注的焦点。化石记录表明，第一对类似鳍的结构出现在早期脊椎动物的体壁中。然而，现存的无颌纲七鳃鳗和盲鳗缺乏成对的鳍，因此很难确定脊椎动物祖先获得成对鳍的发育过程。幸运的是，我们对不同类群侧板中胚层发育机制的认识的最新进展为理解脊椎动物成对附肢的进化起源提供了线索。
