Description: English: A photograph of shell-less gastropod called sea butterfly Clione limacina (Gastropoda: Gymnosomata). The specimen is "flying" in the water column using a pair of diminutive "wings" – parapodia. Date:. Source: sanctuaries.nos.noaa.gov transferred form English wikipedia. Author: Jeff Hannigan (NOAA). Other versions: File:Clione limacina detail.jpg — cropped version.
Description: English: Larva of Pneumoderma. Date: 1896. Source: Lydekker R. (ed.) (1896). The royal natural history 6(section 12): page 367. Author: Unknown authorUnknown author.