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What about deep sea anglerfishes?

Posted by gjmaven on 26 Jan 2012 at 20:45 GMT

The mature male is parasitic on the female. After attaching to the much larger female, the male's internal organs, I expect including the brain but definitely not the testes, degenerate to a marked degree. While female Lophius have a very small brain to body mass ratio, the male's brain is likely to be much smaller than the female' before as well as after this degenerative process.

The authors might want to look into this group of fishes. There are likely to be museum specimens available. As well as a compendium of modestly off color jokes.

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