Fowlerina, one kind of "sea angel", is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of small sea slug

Slug

Slug is a common name that is normally applied to any gastropod mollusc that lacks a shell, has a very reduced shell, or has a small internal shell...

s, marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 opisthobranch gastropod mollusks in the family Clionidae

Clionidae

Clionidae is a family of sea angels, which are a group of pelagic marine gastropods.They are shaped a little like angels, and have flapping "wings", hence their common name. They are gelatinous, mostly transparent pteropods, and they only have shells in their embryonic stage...

.

Sometimes called pteropods, these are floating pelagic creatures which swim by flapping two wing-like extensions of their body known as parapodia.

Please also see: Sea angel

Sea angel

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....

 and Clionidae

Clionidae

Clionidae is a family of sea angels, which are a group of pelagic marine gastropods.They are shaped a little like angels, and have flapping "wings", hence their common name. They are gelatinous, mostly transparent pteropods, and they only have shells in their embryonic stage...

.

Species

Species in the genus Fowlerina include:

• Fowlerina punctata Tesch, 1903
• Fowlerina zetesios Pelseneer
  Paul Pelseneer
  Jean Paul Louis Pelseneer was a Belgian malacologist, morphologist, ethologist and phylogenist....
  
  , 1906