Clione limacina

Clione limacina is a small, transparent pelagic sea slug in the family Clionidae, known as the sea angel. It lives in cold ocean waters and preys mainly on shelled pteropods.

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Pteropod: A pelagic gastropod mollusk, including both shelled and shell-less forms. Clione is a shell-less pteropod whose prey includes shelled members of this group.
Clionidae: A family of shell-less, predatory sea slugs in the order Pteropoda. Clione limacina belongs to this family of swimming pteropods.
Arctic food web: The network of feeding relationships among organisms in Arctic ecosystems. Clione is a predator of sea butterflies within cold-water plankton communities.
Thecosomata: An order of pelagic gastropods, many of which retain a small external shell. Sea butterflies in this group are shelled relatives and common prey of Clione.
Limacina helicina: A small, shelled sea butterfly that lives in cold ocean waters. This pteropod is a principal prey species of Clione limacina.
Gymnosomata: An order of pelagic gastropods commonly called sea angels. Clione is classified among these shell-less, free-swimming pteropods.
Ocean acidification: The decline in ocean pH caused mainly by seawater absorbing atmospheric carbon dioxide. Changes in carbonate chemistry threaten the shelled pteropods that Clione eats.
Sea butterfly: A common name for a small, swimming pelagic gastropod, often with a coiled shell. Unlike these shelled prey, Clione is a shell-less predator called a sea angel.
Pteropod feeding: The specialized capture and consumption of pelagic snails by marine predators. Clione captures shelled pteropods with grasping structures and feeds on their soft tissues.
Parapodium: A lateral body extension used for movement or other functions in some invertebrates. Clione's paired parapodia beat like wings to propel it through the water.