Mariella is an ammonoid genus, named by Nowak (1916) from the upper Albian and Cenomanian stages of the mid Cretaceous, included in the Turrilitidae. Its type is Turrilites bergeri Description Mariella resembles Turrilites in general form. The shell is asymmetric, closely wound in a long expanding trochoidal spire. Ribs are slightly oblique and are rather feeble, each with 4 more or less equally spaced tubercles. Turrilites differs primarily in being more strongly ribbed and in having a more oval aperture. Distribution Fossils of Mariella have been found in Angola, Antarctica, Australia, Brazil, Canada (British Columbia), Colombia (Hiló Formation), France, Germany, Iran, Japan, Kazakhstan, Madagascar, Mexico, Mozambique, New Zealand, South Africa, Spain, Switzerland, Turkmenistan, Ukraine, the United Kingdom, and the United States (California, Texas, Oregon). References Further reading Ammonitida Albian genus first appearances Cenomanian genus extinctions Ammonites of South America Cretaceous Brazil Cretaceous Colombia Ammonites of Australia Cretaceous animals of Australia Ammonites of Antarctica Late Cretaceous ammonites of North America Cretaceous Canada Cretaceous Mexico Cretaceous United States Cretaceous Africa Cretaceous Asia Late Cretaceous ammonites of Europe