1603 -by Abraham Ortelius, from Theatrum Orbis Terrarum. Now appears in: "A Ketos in Early Athens: An Archaeology of Whales and Sea Monsters in the Greek World" by Papadopoulos and Ruscillo in American Journal of Archaeology. Ortelius issued another version of his famous map in 1603, including this detail of what he identified as the Steipereidur. Despite its fearsome teeth, Ortelius considered this animal the tamest of whales, explaining that it "fights other whales on behalf of fishermen."
Front half is a horse, back half is sea creature (usually a dolphin.) Also Called Hippocampus or the Steeds of Neptune Might actually be The fanciful version above may be based on a misunderstanding of a description of either of the an actual sea-horse (genus: hippocampus) which are only a few inches long, or a hippopotamus. Seen in A common symbolic image among sea-farers, and in heraldry.
Merrow - The Irish merpeople are called Merrow's. They can be distinguished by the red feather caps they wear to propel themselves; if stolen, they cannot return underwater. Their appearance is more fish than human, but that does not deter the women from falling in love with humans. And despite their unique beauty, fishermen avoid them because their presence, though kind in thought, is generally an omen of a storm.