. "Mola"@en . . . . . . . "A sunfish (or mola) is any fish in the Mola genus (family Molidae). The fishes develop their truncated, bullet-like shape because the back fin, with which they are born, never grows. Instead, it folds into itself as the creature matures, creating a rounded rudder called a clavus. Mola in Latin means \"millstone\" and describes the ocean sunfish\u2019s somewhat circular shape."@en .