Argonaut octopuses are best known for what appears to be a beautiful, delicate spiral shell. We now know that female argonauts spend their whole lives growing these thin ‘shells’, which they use as buoyant submersibles and as brood chambers for their eggs. But what about male Argonauts? For hundreds of years, no one ever saw … Continue reading “Sperm Worms”: How Male Argonauts Taught Scientists About Octopus Sex