Eurypterid

Eurypterids have the common name 'sea scorpions'. That's exactly what they are, giant, eight foot long scorpions. They are brown creatures with large pincers and a scorpion tail. Similar to how a cat would pur, eurypterids make a hissing sound when they are pet. Elves use eurypterids as a way of travel in Atlantis, similar to a taxi.