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Agnatha |
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Agnatha [′ag·nə′thə] (vertebrate zoology) The most primitive class of vertebrates, characterized by the lack of true jaws. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Metamorphosis of larval sea
lamprey Petromyzon marinus (an agnathan fish) is also affected by
exposure to perchlorate (Manzon and Youson 1997, 2002; Manzon et al. Because the evidence of these
fish, called agnathans, is scant and fragmentary, scientists know little
about the agnathans' appearance or about their evolutionary
history. |
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