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Under "Reason for trait loss"
It may be possible that the loss of hemoglobin might be tied to a necessary adaptation for the icefish. Do to the the lower amounts of hemoglobin across several Antarctic species, it may be that this species survived by adopting minimizing iron requirements. The minimization could have aided the species survival 8.5 million years ago when Arctic diversity plummeted drastically.

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Channichthyidae