by Sea angels (clade Gymnosomata) are a large group of extremely small, swimming sea slugs.
Sea angels are also sometimes known as "cliones" but this is potentially misleading because the family Clionidae is just one of the families within this clade.
In this clade, the foot of the gastropod has developed into wing-like flapping appendages (parapodia) and their shells have been lost.
Both adaptations suit their free-swimming oceanic lives.
The adaptations also explain the common name sea angel and the scientific name of the order; from Greek gymnos meaning "naked" and soma meaning "body".
Source
Sea angels are also sometimes known as "cliones" but this is potentially misleading because the family Clionidae is just one of the families within this clade.
In this clade, the foot of the gastropod has developed into wing-like flapping appendages (parapodia) and their shells have been lost.
Both adaptations suit their free-swimming oceanic lives.
The adaptations also explain the common name sea angel and the scientific name of the order; from Greek gymnos meaning "naked" and soma meaning "body".
Source
