檢視盾皮鱼纲的原始碼

[[File:盾皮鱼纲.jpg|缩略图|[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E7%9B%BE%E7%9A%AE%E9%B1%BC%E7%BA%B2%20%20%E6%90%9C%E7%8B%90&step_word=&hs=0&pn=2&spn=0&di=20350&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=2&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=-1&cs=2331512948%2C247037698&os=107909824%2C3371055426&simid=4215310597%2C762570296&adpicid=0&lpn=0&ln=399&fr=&fmq=1629857130033_R&fm=result&ic=&s=undefined&hd=&latest=&copyright=&se=&sme=&tab=0&width=&height=&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fss3.baidu.com%2F9fo3dSag_xI4khGko9WTAnF6hhy%2Fzhidao%2Fpic%2Fitem%2Fd62a6059252dd42a92daa573043b5bb5c8eab813.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fzit1w5_z%26e3Bkwt17_z%26e3Bv54AzdH3Fq7jfpt5gAzdH3Fccmdnb89m8acm8la8d_z%26e3Bip4s&gsm=1&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined 原图链接][https://zhidao.baidu.com/question/556238146105619012.html 来自百度知道]]]
'''盾皮鱼纲'''是最原始的颌口类。它们初见于上志留纪，至泥盆纪则称霸水域，故泥盆纪之所以被称为鱼类的时代（Age of Fishes），就是由于此类动物之盛产。当时介皮类式微，而软骨鱼类仅见端倪。泥盆纪结束，盾皮鱼类大部分灭亡。古生代结束后，便不再有此类动物存在。