Allonautilus scrobiculatus is a rare species that can be distinguishes from the natty Nautilus pompilius by its hairy, slimy shell. That doesn't seem like a distinction to be proud of, but I guess it takes all types to fill an ocean.
Nautilus pompilius (left) swimming next to a rare Allonautilus scrobiculatus (right) off of Ndrova Island in Papua New Guinea.Peter Ward
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