Callistoctopus Callistoctopus luteus Callistoctopus bunurong Callistoctopus ornatus Callistoctopus rapanui Callistoctopus macropus Octopus kermadecensis Octopus (genus) Octopus minor Octopodidae Iwao Taki Australian weasel shark Octopus cyanea Octopus Deimatic behaviour Cephalopod Cephalopod size