Mermaids
Mermaids and mermen (sometimes called Marine Humans by non-humanoids) are a race of aquatic humans that are totally water dependent. While they can breathe air, they are not able to walk on land, for they have lost their legs and now have fish-like tails. They will usually live in seas close to the land so they have access to more resources, since they too need the same resources as humans do. A close relative of this subspecies is the Toadian, an amphibious human subspecies.