Heminautilus
Heminautilus Temporal range: Aptian
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Scientific classification | |
Kingdom: | |
Phylum: | Mollusca
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Class: | |
Subclass: | Nautiloidea
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Order: | |
Superfamily: | |
Family: | |
Genus: | Heminautilus Spath 1927
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Species | |
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Heminautilus is an extinct genus of nautiloids from the nautilacean family that lived during the Early Cretaceous.[1] Fossils of Heminautilus have been registered in rocks of Barremian and Aptian age.[2] 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.[1]
Species[]
The following species of Heminautilus have been described:[2]
- 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),[3] Egypt,[4] France, Hungary,[5] Japan, Mexico, Spain, Switzerland, Tunesia,[6] the United Kingdom, the United States (Arkansas), Venezuela.[2]
See also[]
- List of nautiloids
References[]
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: 61–212. doi:10.4267/2042/58977. Retrieved 2017-01-20.
- Kummel, B. (1964). Nautiloidea -Nautilida. Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press.
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. Vol. 363. pp. 1–560.
- Prehistoric nautiloid genera
- Cretaceous animals of Asia
- Cretaceous molluscs of Europe
- Cretaceous animals of North America
- Cretaceous Mexico
- Cretaceous United States
- Cretaceous animals of South America
- Cretaceous Colombia
- Fossils of Colombia
- Aptian life
- Early Cretaceous genus first appearances
- Early Cretaceous genus extinctions
- Fossil taxa described in 1927
- Prehistoric nautiloid stubs