Spirula spirula is a small, deep sea cephalopod related to squid and cuttlefish.
Their most unique feature is their spiralling shell which is so strong and buoyant that they often wash up on beaches, perhaps after drifting for miles on currents.
They also have a light-emitting photophore on their back end. Since their shell is so buoyant that they typically swim in a vertical position with their tentacles dangling beneath them, they’re basically wearing a light-up hat with wings!
Images: Dr. Steve O’Shea/Udo Schmidt/Fritz Geller-Grimm/Rachel Caauwe