Spitidiscus

Spitidiscus is a group of ancient sea creatures called ammonites. Ammonites were living in the oceans many millions of years ago, and they had spiral shells that look like coiled shells or flowers. Spitidiscus belongs to a special family of ammonites known as Holcodiscidae.

These creatures were part of a huge variety of life in the ancient seas. They swam and moved around, playing an important role in the ocean ecosystems of their time. Studying Spitidiscus helps scientists learn more about how life evolved long ago and how these amazing creatures lived and interacted with their environment.

Species

Here are some species that belong to the group Spitidiscus:

• Spitidiscus hugii
• Spitidiscus kilapiae - Found in Argentina
• Spitidiscus oregonensis - Found in Oregon
• Spitidiscus riccardii - Found in Argentina
• Spitidiscus rotulia - Found in England
• Spitidiscus simitiensis - Found in Colombia
• Spitidiscus vandeckii

Description

Spitidiscus is a group of ancient sea creatures called ammonites. They had spiral shells that were mostly round in shape, with a broad, gently curved side and a deeper, indented back. Their shells had many small, thin lines that sometimes split, along with regular, shallow indentations. The main species, S. rotulia, was found in rocks from England that are from a time called the Hauterivian.

Biostratigraphic significance

The first appearance of the species Spitidiscus hugii or Spitidiscus vandeckii is used to mark the start of the Barremian.

Distribution

Spitidiscus has been found in many places around the world, including Agrio Formation in Argentina, the Magdalena Valley, Simití, and Cáqueza in Colombia, the Kaliste Formation in the Czech Republic, France, Gagra in Georgia, the Maiolica Formation in Italy, the Subbetics in Spain, Foggy Creek in Oregon, Bulgaria, Portugal, Russia, Morocco, and Mexico.