- This article is about the shark-shaped daemon. For the Greek river god, see Achelous.
In Greek mythology, Acheilos could transform into a shark. He also stated that he was fairer than Aphrodite .
Acheilos saved Ajax the Lesser from death, which was decreed by the goddess Athena. Akheilos was ultimately killed by her and his power was then bestowed to Poseidon.
It was said that Akheilos was the son of Lamia and Zeus.