lungfish

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seasquirt
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lungfish

Post by seasquirt » Sun Dec 30, 2007 11:35 am

Are the lungs of lungfish and mammals homologous structures or convergent?

Darby
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Re: lungfish

Post by Darby » Sun Dec 30, 2007 3:34 pm

This is something that seems t change periodically - the last source I read had them as non-homologous, but they had earlier been considered homologous.

In the same vein, I've seen lungs presented as derived from brood pouches, but now the prevailing hypothesis considers them derived from swim bladders.

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MrMistery
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Post by MrMistery » Thu Jan 03, 2008 1:42 pm

they have been presented to me as homologous, but i have always taken this skeptically as in lungfish they are derived from the esophagus
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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