Claim: Nautilus praepompilius is classified under the order of Nautilida (a large and diverse order of generally coiled nautiloid cephalopods ) in the family Nautilidae of the Animalia kingdom.
Evidence: Order: Nautilida The Nautilida constitute a large and diverse order of generally coiled nautiloid cephalopods that began in the mid Paleozoic and continues to the present with a single family, the Nautilidae which includes two genera, Nautilus and Allonautilus, with six species. Family: Nautilidae Animalia Kingdom: