While octopus brains are very different from vertebrate brains, they share with vertebrates, a huge number of microRNAs.
Paleontology sometimes seems like a kind of imaginative Rorschach test with the flattened fauna of roadkill.
Outstandingly bright — with eyes that strikingly resemble ours — yet their ancestors split from mammals and birds 600 million years ago.
Just as vertebrates differ greatly in intelligence and sentience, invertebrates may differ greatly too.
Even compared to each other, the genomes of three cephalopods studied had been broken up and extensively reorganized.