Distribution in scandinavian waters
|Maximum length: 4 cm. Compare
with a finger.
Appearance: Naked sea butterflies resemble angels. It has a long spool-formed body that is blueish and transparent with pink to red-yellow areas. The shell is absent. The head is well developed and clearly evident because of an indentation on the upper part of the body. The body has robust flaps (mantel lobes) that are used for propulsion.
Depth: From sea level to unknown depth.
Misc: Naked sea butterflies of the clione species are found mostly during the autumn and winter. It is a predator and as an adult preys upon copepods and the shell furnished limacina-naked sea butterfly. The young eat amongst other things alga plankton.
Classification: Naked sea butterflies are members of the order Theocosomata (shelled pteropod), an opistobrach from the gastropod group under the molluscs.