Abas, son of Poseidon and Arethusa. A Thracian by birth, Abas founded a tribe known as the Abantians or Abantes. Abas and his Abantian followers migrated to the island of Euboea, where he subsequently reigned as king. He was father of Chalcodon, and grandfather of Elephenor; the latter who led a contingent of Abantian warriors from Euboea to the Trojan War.
Abas was one of Diomedes' companions, whom Aphrodite turned into a swan.
Abas was a son of Metaneira who was changed by Demeter into a lizard, because he mocked the goddess when she had come on her wanderings into the house of her mother, and drank eagerly to quench her thirst. Other traditions relate the same story of a boy, Ascalabus, and call his mother Misme.