Nautilus cookanus

{{Short description|Extinct species of mollusc}}

{{Speciesbox

| fossil_range = Late Eocene

| image = Nautilus cookanum.jpg

| image_caption = artist's reconstruction

| genus = Nautilus

| species = cookanus

| authority = Whitfield, 1892

| synonyms =

• Nautilus cookanum Whitfield, 1892 (Missp.)
• Eutrephoceras cookanum (Whitfield, 1892)

}}

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.Ward, P.D. & W.B. Saunders 1997. [https://www.jstor.org/stable/1306604 Allonautilus: a new genus of living nautiloid cephalopod and its bearing on phylogeny of the Nautilida]. Journal of Paleontology 71(6): 1054–1064. 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).{{cite journal |last1=Ryoji |first1=W. |year=2008 |title= First discovery of fossil Nautilus pompilius (Nautilidae, Cephalopoda) from Pangasinan, northwestern Philippines |journal= Paleontological Research |volume=12 |issue=1 |pages=89–95 |doi= 10.2517/1342-8144(2008)12[89:FDOFNP]2.0.CO;2|display-authors=etal}} Its name has frequently been misspelled as "cookanum".{{Cite journal|title = Miocene Nautilus (Mollusca, Cephalopoda) from Taiwan, and a review of the Indo-Pacific fossil record of Nautilus| date=2022 | doi=10.1111/iar.12442 | last1=Goedert | first1=James L. | last2=Kiel | first2=Steffen | last3=Tsai | first3=Cheng-Hsiu | journal=Island Arc | volume=31 | s2cid=247532223 | doi-access=free }}