Английская Википедия:Berriasella

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Шаблон:Short description Шаблон:Automatic taxobox

Berriasella is a discoidal evolute perisphinctacean ammonite, and type genus for the neocomitid subfamily Berriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from the umbilical seam across the venter; its whorl section generally compressed, the venter more or less narrowly rounded. The species Berriasella jacobi traditionally has been regarded an index fossil defining the base of the Cretaceous, however since 2016 this had been replaced by the first occurrence of Calpionella alpina. Some authors regard B. jacobi as instead belonging to the genus Strambergella.[1]

Berriasella, named by Uhlig, 1905, is known from the late Upper Jurassic, Tithonian, to the early Lower Cretaceous, Berriasian and has a fairly worldwide distribution.[2]

Distribution

Fossils of Berriasella have been found in:

Jurassic
Cretaceous

References

Шаблон:Reflist

Further reading

Шаблон:Taxonbar


Шаблон:Ammonitina-stub

Партнерские ресурсы
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Разное

  1. ↑ Шаблон:Cite journal
  2. ↑ Paleobiology Database - Berriasella at Fossilworks.org
Источник — http://wikihandbk.com/ruwiki/index.php?title=Английская_Википедия:Berriasella&oldid=13486754