I thought I would take up your offer "if someone else might like to" give some more info.
"Sea angels previously known as one kind of pteropod, are a large group of small swimming sea slugs in six different families. These are pelagic marine opisthobranch gastropod molluscs in the clade Gymnosomata within the larger clade Heterobranchia.
In this clade, the foot of the gastropod has developed into wing-like flapping appendages (parapodia) and their shells have been lost. These are both adaptations which 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."
The other suborder of pteropods, Thecosomata, are superficially similar to sea angels but are not closely related. They have larger, broader parapodia, and most species retain a shell; they are commonly known as sea butterflies.
Sea angels are gelatinous, mostly transparent and very small, with the largest species (Clione limacina) reaching 5 cm. Clione limacina is a polar species; those found in warmer waters are far smaller. Some species of sea angel feed exclusively on sea butterflies; the angels have terminal mouths with the radula common to mollusks, and tentacles to grasp their prey, sometimes with suckers similar to cephalopods. Their "wings" allow sea angels to swim much faster than the larger (usually fused) wings of sea butterflies.
The animals are simultaneous hermaphrodites, and fertilization occurs internally. A gelatinous egg mass is released during spawning, and the eggs float freely until hatching. Their embryonic shells are lost within the first few days after hatching.
The IPCC reports that increasing atmospheric carbon dioxide is causing acidification of the oceans, which could eliminate pteropods from the Southern Ocean and cause serious repercussions throughout the food chain. In popular culture
** The Digimon MarineAngemon is based on the Sea Angel in appearance and name.
** Pokémon water-types Phione and Manaphy are based on the sea angel.
** The Skies of Arcadia monsters Ghastling, Graver, Lurker, and Ghrost resemble sea angels."