Aridian

The Aridians were a marine humanoid race native to Aridius, possessing silvery skin, crested heads and fins along their spines. They originally lived in an underwater city, but the oceans slowly dried up and turned into deserts. The Aridians had to not only adapt to this new climate, but also contend with the Mire Beasts and a brief Dalek invasion. (DW: The Chase)