Acipenseriformes /æsᵻˈpɛnsərᵻˈfɔːrmiːz/ is an order of basal ray-finned fishes that includes the sturgeons and paddlefishes, as well as some extinct families. Notable characteristics of Acipenseriformes include: \n* Cartilaginous endoskeleton \n* Lack of vertebral centrum \n* Spiral valve intestine \n* Conus arteriosus