Limacina retroversa  Limacina retroversa is a species of swimming predatory sea snail in the family Limacinidae, that belong to the group commonly known as sea butterflies (Thecosomata). There is one subspecies: "Limacina retroversa australis" (Eydoux & Souleyet, 1840)  This marine species has a wide distribution:  Pteropod "Clione limacina" feeds almost entirely on genus "Limacina": on "Limacina helicina" and on "Limacina retroversa".