pteropod noun1 •Any of free-swimming pelagic sea snails and sea slugs, of the suborder Thecosomata, that have winglike lobes on the feet; a sea butterfly.Pteropods, also known as sea butterflies, are marine gastropods adapted to pelagic life.[…]When pteropods constitute a high percentage of the ooze the deposit is called pteropod ooze. — 1998 formspteropods
