which is the smallest sea animal in the world Share with your friends Share 0 Krishnakoli Datta answered this Zooplanktons are the smallest sea animals in the world. 0 View Full Answer Abhigyan Dey answered this The smallest sea creatures are zooplankton. Hundreds of sea animals fall into the zooplankton categories, including tiny shrimp-like animals, swimming worms, jellyfish and snails that fly. Zooplankton are vital to marine life. 0