Nautilus cookanus

Nautilus cookanus is an extinct species of nautilus. It lived during the Eocene epoch. N. cookanus placed within the genus Nautilus, together with extant species based on their shared shell characters.^[1] Fossils of the species from the Late Eocene Hoko River Formation are noted as one of the two oldest occurrences for the genus (with the other, older occurrence being N. praepompilius of the Paleogene).^[2] Its name has frequently been misspelled as "cookanum".^[3]

Nautilus cookanus Temporal range: Late Eocene
artist's reconstruction
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Family:	Nautilidae
Genus:	Nautilus
Species:	N. cookanus
Binomial name
Nautilus cookanus Whitfield, 1892
Synonyms
Nautilus cookanum Whitfield, 1892 (Missp.) Eutrephoceras cookanum (Whitfield, 1892)