Английская Википедия:Cheltonia

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Шаблон:Short description Шаблон:Automatic taxobox

Cheltonia is an extinct genus of ammonite from the Upper Sinemurian substage of Lower Jurassic of Europe, Africa,[1] and America.Шаблон:Citation needed It is probably a microconch of genus Oxynoticeras.[2]

Description

Ammonites belonging to this genus had small platyconic shell, on which the last whorl has been eccentrically coiled. Ventral rostrum could be preceded by 3 to 5 crawlings. Umbilicus took about 30—40% of diameter. Ribs were falcoid and weak. Suture has been the same as in the case of young Oxynoticeras.[2]

References

Шаблон:Reflist

Шаблон:Taxonbar


Шаблон:Ammonitina-stub

  1. Cheltonia at Fossilworks.org
  2. 2,0 2,1 Ошибка цитирования Неверный тег <ref>; для сносок Howarth2013 не указан текст