Ancalecetus (from Greek ankale, "bent arm", and ketos, "whale") is an extinct genus of early whale known from the Late Eocene (Priabonian, 37.2 to 33.9 million years ago) Birket Qarun Formation (29°18′N 30°00′E / 29.3°N 30.0°E, paleocoordinates 24°36′N 26°12′E / 24.6°N 26.2°E) in Wadi Al-Hitan, Egypt.The species is named after anthropologist and primate researcher Elwyn L. Simons who discovered the type specimen in 1985.