ocean phantom
n.— «The Ice Age melts away 100 million years later, marking the beginning of the end of large mammals and giving rise to creatures like the “ocean phantom,” a jellyfish the size of a truck; the “swampus,” a relative of the octopus that emerges from swamps to feed; and the “toraton,” a reptile bigger than dinosaurs.» —“King rat and the brilliant squibbon” by Miguel Llanos MSNBC May 2, 2005. (source: Double-Tongued Dictionary)