Simplicioceras centrale

Simplicioceras centrale

(J. Sowerby, 1812)

Common name Nautilus
Fossil group Molluscs
Order Nautilida
Family Nautilidae
Genus Simplicioceras
Taxonomic status Accepted
Geological age Ypresian
Recorded rarity by age
Ypresian: Not yet established
View age-specific evidence and explanation
AgeRecorded OccurrencesLocalitiesRarity
Ypresian22Not yet established

These counts describe published LBPS Occurrence records with directly assigned, unambiguous geological-unit mappings—not specimen abundance. Records at restricted Localities and ambiguous or unsupported ages are excluded. Species-level age labels are not used as proof of an age-specific Occurrence.

Specimen-based rarity requires comparable, correctly identified physical fossils, geological provenance and publication permissions. It does not estimate your chance of finding a fossil or collecting access.

Representative Specimens

Selected reference specimens illustrating this species from different geological units and fossil sites.

Quick Identification

Look for: a smooth, tightly coiled nautilus with a rounded ventricose whorl, narrow deep umbilicus and comparatively simple concave to gently sinuous chamber sutures.

Identification Examples

Choose a fossil site to view photographed reference specimens.

Summary

Simplicioceras centrale was a rounded chambered cephalopod that lived in the Eocene seas represented by the London Clay. The chambers inside its coiled shell controlled buoyancy, while the animal occupied the outermost body chamber and could move through the water by jet propulsion.

Its feeding behaviour is not directly preserved. Like other nautiloids it was probably a predator and scavenger, taking small animal prey and carrion. Its smooth, rounded shell shows that London Clay nautiloids were not all built alike: this form was more compact and evenly rounded than the sharper-profiled Deltoidonautilus.

Diagnostic Features

  • Shell is strongly involute, with earlier whorls largely concealed.
  • Whorl is rounded and ventricose rather than sharply compressed.
  • Umbilicus is narrow and relatively deep.
  • Septal sutures are simple to gently sinuous rather than strongly zig-zag.
  • Shell surface is largely smooth apart from growth lines.

Fossil Details

Typical size
About 15–60 mm; larger individuals are known.
Fossil material
Shell, Internal Mould / Cast
Preservation
The aragonitic shell may dissolve to leave a smooth internal mould. Compression can change the rounded whorl profile, and weathering may erase the simple sutures, making incomplete examples difficult to separate from other nautiloids.

Similar Species

Recorded Fossil Sites

Synonyms & Previous Names

Nautilus centralis; Eutrephoceras centralis

References

  • Edwards, F. E. (1849). A monograph of the Eocene Mollusca, or descriptions of shells from the older Tertiaries of England. Part I. Cephalopoda. Palaeontographical Society Monograph, 2, 1–56. Palaeontographical Society, London View reference
  • Hewitt, R. A. (2002). A review of the Early Eocene nautiloids of the London Clay Formation (upper division C to lowest division E) of south-east England, with particular reference to concretionary horizons and faunules in the offshore facies strata at Southend-on-Sea, Essex and in the adjacent cliffs of the Isle of Sheppey, Kent. Tertiary Research, 21(1–4), 39–50 View reference
Last Reviewed
15 August 2026 Reviewed by Sam Harris