David Shale / Shelled Pteropod / Sea butterfly {Diacria trispinosa} with egg string attached, from between 188 and 507m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Midwater pteropod molluscs / Sea butterflies (Clione limacina) Mid-Atlantic Ridge, North Atlantic Ocean

Solvin Zankl / Sea butterfly {Clio recurva} (a thecosomate pteropod), Atlantic ocean

David Shale / (Cione limacina) sea angel, a pelagic pteropod mollusc from the mid-Atlantic, deep sea Atlantic ocean

Flip Nicklin / Naked Sea Butterfly (Clione limacina) underwater portrait, Arctic

David Shale / Gymnosome Pteropod mollusc, Sea butterfly, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Gymnosome Pteropod mollusc, Sea butterfly, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Shelled Pteropod / Sea butterfly {Diacria trispinosa} with egg string attached, from between 188 and 507m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Gymnosome Pteropod mollusc, Sea butterfly, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Gymnosome Pteropod mollusc, Sea butterfly, Mid Atlantic Ridge, N Atlantic, depth in 800m

David Shale / Shelled Pteropod / Sea butterfly {Diacria trispinosa} with egg string attached, from between 188 and 507m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Midwater pteropod mollusc / Sea angel(Clione limacina) Mid-Atlantic Ridge, North Atlantic Ocean