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Heminautilus is an extinct genus of nautiloids from the nautilacean family Cenoceratidae that lived during the Early Cretaceous. Fossils of Heminautilus have been registered in rocks of Barremian and Aptian age. Nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species.

Heminautilus has a discoidal compressed involute shell with flanks converging on a narrow flattened outer margin, the venter. Whorls are higher than they are wide. The suture is sinuous with a ventral lobe, subtriangular saddles on the ventral shoulders, broad lateral lobes, and narrow rounded saddles on the umbilical shoulders. The siphuncle is subcentral.

Species

The following species of Heminautilus have been described:

• H. boselliorum
• H. etheringtoni
• H. japonicus
• H. lallierianus
• H. rangei
• H. sanctaecrucis
• H. saxbii
• H. stantoni
• H. tejeriensis
• H. tyosiensis
• H. verneuilli

Distribution

Fossils of Heminautilus have been found in Bulgaria, Colombia (at Caballos Formation, Boyacá, Tolima and Une Formation), Egypt, France, Hungary, Japan, Mexico, Spain, Switzerland, Tunisia, the United Kingdom, the United States (Arkansas), Venezuela.

See also

• List of nautiloids

References

1. ^ Kummel, 1964
2. ^ Heminautilus at Fossilworks.org
3. Baudouin et al., 2016, p.87
4. Baudouin, 2016, p.76
5. Baudouin, 2016, p.66
6. Baudouin, 2016, p.72

Bibliography

• Baudouin, Cyril; Delanoy, Gérard; Moreno Bedmar, Josep Antón; Pictet, Antoine; Vermeulen, Jean; Conte, Gabriel; Gonnet, Roland; Boselli, Patrick; Boselli, Marc (2016). "Revision of the Early Cretaceous genera Heminautilus SPATH, 1927, and Josanautilus MARTÍNEZ & GRAUGES, 2006 (Nautilida, Cenoceratidae)" (PDF). Carnets de Géologie. 16 (5): 61–212. doi:10.4267/2042/58977. Retrieved 2017-01-20.
• Kummel, B. (1964). Nautiloidea -Nautilida. Geological Society of America and University of Kansas Press. {{cite book}}: |work= ignored (help)

Further reading

• Sepkoski Jr., J.J. (2002). D.J. Jablonski & M.L. Foote (ed.). "A compendium of fossil marine animal genera". Bulletins of American Paleontology. 363: 1–560.

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• Prehistoric nautiloid genera
• Cretaceous animals of Asia
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• Cretaceous animals of North America
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• Cretaceous Colombia
• Fossils of Colombia
• Aptian life
• Early Cretaceous genus first appearances
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