Clionid

Notes:

 * Being a mollusc of mischievous bearing and ghostly aspect, much given to rollicking in the air in a dance at once graceful and deadly. Alongside the Limule, they have grown to prominence in the wake of the great cataclysm, spreading as a plague across Abyssea.  Of the little that is known of these invertebrates, their proclivity for aggression towards mankind is well-documented.