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Sirenoidei

1、肺鱼目

...代美洲和非洲肺鱼相接近肺鱼亚纲︰脑颅分成可活动两部分上腭齿退化在较晚期类群中已消失一些齿愈合成齿板仅1目肺鱼目(Sirenoidei)单肺亚目(Monopneuma):单个有功能肺胸鳍和腹鳍退化但成触须状鳞大现存澳大利亚肺鱼1种双肺亚目(Dipneuma):两个有功能肺体鳗状鳞小...

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