檢視七鳃鳗纲的原始碼

[[File:七鳃鳗纲.jpg|缩略图|[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E4%B8%83%E9%B3%83%E9%B3%97%E7%BA%B2&step_word=&hs=0&pn=9&spn=0&di=41150&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=385883519%2C4047992222&os=4185735642%2C3445789138&simid=4232792013%2C720178394&adpicid=0&lpn=0&ln=258&fr=&fmq=1630015484582_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=15&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fpic1.zhimg.com%2F50%2Fv2-b84f51c362fbd8a072070bd62fc161dc_hd.jpg%26refer%3Dhttp%3A%2F%2Fpic1.zhimg.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Djpeg%3Fsec%3D1632607670%26t%3D07d2d590ed98bb55daad419139a5c33c&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bziti7_z%26e3Bv54AzdH3Fq7jfpt5gAzdH3Fdmmdb0ac8%3Fqv%3D8&gsm=a&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined 原图链接][https://www.zhihu.com/question/266287051?qc=1 来自知乎]]]
'''七鳃鳗纲'''，学名：Petromyzontida，又名八目鳗纲，是脊椎动物的一纲。