The Allonautilus Perforatus belongs to the Kingdom Animalia, Phylum Mollusca and Family Nautilidae, which is characterize by smooth shells with straight to sinuous sutures.
Kingdom: Animalia Phylum: Mollusca Family: Nautilidae Nautilidae, both extant and extinct, are characterized by involute or more or less convolute shells that are generally smooth, with compressed or depressed whorl sections, straight to sinuous sutures, and a tubular, generally central siphuncle. 
