Tiktaalik is a genus of extinct fish . This sarcopterygian ( lobe-finned ) fish from the late Devonian period , has many features akin to those of tetrapods ( four-legged animals ) . Tiktaalik is a genus of extinct sarcopterygian ( lobe-finned `` fish '' ) from the late Devonian period , with many features akin to those of tetrapods ( four-legged animals ) .