OOOHH WWWOOOWW.
Thoughts and opinions: I think that this iguana had developed the ability to be submerged underwater for various length of time because of its diet of seaweed and algae. ( It must have been available to the iguanas ancestors and then as the water level rose it had to go completely into the water to reach its food.) maybe. who knows.

I like your question and ideas. It is an interesting case of one type of iguana adapting to survive in a very different aquatic environment. Looking forward to reading about how this happened!
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