Critter of the deep - Episode 2: A little Antarctic octopus
This is a really cute little octopus (Pareledone genus) from cold Antarctic waters, and we have records of them living from 62-2804 m deep.
Octopods have three hearts and contractile veins that pump hemolymph (like blood), which is highly enriched with the blue oxygen transport protein hemocyanin (so they are blue-blooded).
One Pareledone species, P. charcoti, has the highest concentration of hemocyanin in its blood – at least 40 percent more compared to the other species, and ranks amongst the highest levels reported for any octopod.
There are five described species in the genus Pareledone and several undescribed species in this group. It is the most commonly found octopus genus in Antarctica.
Here's a great link to more information from one of the international experts on this group, Dr. Louise Allcock: