Still, the study lends credence to a longstanding hunch among researchers in the field, who suspected that the octopus’ ancient relatives had 10 arms, according to CNN. Now, they have direct proof.

a mollusk that split apart from the octopus approximately 480 million years ago. The fact that these species share this unique chromosome suggests that it’s been around in some form for a very long ...

The research suggest octopus and other cephalopods, like squid and cuttlefish, all rely on the ancient chromosome to determine sex.

Scientists have made an exciting discovery about octopuses: they have one of the oldest known sex chromosomes in the animal ...

The clip was shot as part of a National Geographic documentary series that explored the secret lives of deep-sea creatures.