Atlanta peronii

Taxon-Order: 
Neotaenioglossa

click on image for more illustrations

Distribution: 
Cosmopolitan between 40°N and 25°S.
Habitat: 
Epipelagic.
Size: 
Up to 11 mm.
Diet: 
Shelled pteropods, gastropod veliger larvae.
Predators: 
Fish.
Useful Facts or Characters: 

The shells are small, compressed and spirally coiled, glass like, very fragile and keeled.  They have large eyes and a single swimming fin.

References: 

video source: http://player.vimeo.com/video/15442854