檢視囊鳃鱼类的原始碼

[[File:囊鳃鱼类.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&step_word=&hs=0&pn=1&spn=0&di=145120&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=1704944938%2C1919656406&os=126704415%2C2744448493&simid=3355883706%2C200925186&adpicid=0&lpn=0&ln=1228&fr=&fmq=1630015146380_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=11&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fnimg.ws.126.net%2F%3Furl%3Dhttp%253A%252F%252Fdingyue.ws.126.net%252FkXDoT5SS1Sdd0ZfIRf4Wlgpqn16Vnn08cUYeXcTjwhuEB1628672245371.jpeg%26thumbnail%3D650x2147483647%26quality%3D80%26type%3Djpg%26refer%3Dhttp%3A%2F%2Fnimg.ws.126.net%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Djpeg%3Fsec%3D1632607321%26t%3Df6e5f5b2514b979fcfbc1a520ad1a5e1&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3B8mn_z%26e3Bv54AzdH3F1yAzdH3Fw6ptvsjAzdH3FGHcVcAaPac80OncI_z%26e3Bip4s&gsm=1&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined 原图链接][https://www.163.com/dy/article/GH5V5A0P0517O35I.html 来自网易订阅]]]
'''囊鳃鱼类'''鱼类一般分为无颌和有颌两大类﹐而在鱼类分类学上则还常将头索类的文昌鱼纲(Amphioxi)（见文昌鱼）作为鱼形动物归入鱼类的范畴内进行研究。<ref>[https://xw.qq.com/partner/vivoscreen/20210811A0DMED/20210811A0DMED00?isNews=1 用鳃、皮肤呼吸不算什么，它用肠道呼吸]腾讯网</ref>