Squid and octopus genome studies reveal how their elaborate nervous systems evolved

Cephalopod genomes are as weird and wonderful as they are.  

The Hawaiian Bobtail squid, a cephalopod.
Found hunting at night, the Hawaiian Bobtail squid (Euprymna scolopes), displays amazing colors through its light emitting organs. They are common in sand flats around the Hawaiian islands. Credit: David_Slater/Getty Images