The hippocampus or hippocamp, also hippokampos (plural: hippocampi or hippocamps; Greek: ἱππόκαμπος, from ἵππος, "horse" and κάμπος, "sea monster"), often called a sea-horse in English, is a mythological creature shared by Phoenician, Etruscan, Pictish, Roman and Greek mythology, though its name has a Greek origin. The hippocampus has typically been depicted as having the upper body of a horse with the lower body of a fish.
The ahuizotl (from the Classical Nahuatl: āhuitzotl for "spiny aquatic thing", a.k.a. "water dog") is a legendary creature in Aztec mythology. It is said to lure people to their deaths. The creature was taken as a mascot by the ruler of the same name, and was said to be a "friend of the rain gods".The conquistador Hernán Cortés once reported to the King of Castile that one of his men had been killed by an ahuizotl.
