Large Ancyloceras Heteromorph Ammonite

Ancyloceras (Audoliceras) sp.

Order Ammonoidea, Family Pleuroceratidae

Geological Time: Early Cretaceous, Barremian Stage (~115 million years ago)

Size (25.4 mm = 1 inch): Ammonite is 103 mm long on a 100 mm by 60 mm matrix

Fossil Site: Immouzar, Agadir, Morocco

Fossil Code: 11008

Price: Sold

Ancyloceras Heteromorph AmmoniteDescription: Coming from the Cretaceous Barremian Stage (117-113 million year old) deposits of Agadir, Morocco, this is an Ancyloceras (Audiloceras) ammonite. It has what is known as heteromorph shape. While most ammonites have spiral shells that retain the same shape throughout growth (homomorph), a major group of ammonites, the Ancyloceratina, emerged during the Late Jurassic that had uncoiled shells, and were called heteromorph ammonites (different-shaped). While little is known of their mode of life, their uncoiled shells would have precluded fast swimming. They may have wobbled their way through the water column with out-splayed tentacles, sweeping whatever came within their reach into their hungry mouths. As all ammonites, these went extinct at the end of the Cretaceous.

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