"Acipenseriformes /\u00E6s\u0268\u02C8p\u025Bns\u0259r\u0268\u02C8f\u0254rmi\u02D0z/ are an order of basal ray-finned fishes that includes the sturgeons and paddlefishes, as well as some extinct families.Notable characteristics of Acipenseriformes include: Cartilaginous endoskeleton Lack of vertebral centrum Spiral valve intestine Conus arteriosus\u2191 \u2191 \u2191"@en . "Acipenseriformes"@en . . . . . .