Английская Википедия:Heminautilus

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Шаблон:Short description Шаблон:Italic title Шаблон:Taxobox

Heminautilus is an extinct genus of nautiloids from the nautilacean family Cenoceratidae 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, Tunisia,[6] the United Kingdom, the United States (Arkansas), Venezuela.[2]

See also

Шаблон:Portal

References

Шаблон:Reflist

Bibliography

Further reading

Шаблон:Taxonbar


Шаблон:Paleo-Nautiloidea-stub

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  1. ↑ 1,0 1,1 Шаблон:Not a typo, 1964
  2. ↑ 2,0 2,1 2,2 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
Источник — http://wikihandbk.com/ruwiki/index.php?title=Английская_Википедия:Heminautilus&oldid=15196659