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Dumortieria
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Dumortieria
Dumortieria is a genus of ammonites belonging to the family Graphoceratidae.
These cephalopods were fast-moving nektonic carnivores. They lived in the Early Jurassic, upper Toarcian age (from about 180.1 to 175.6 million years ago). Fossils of species within this genus can be found in Bulgaria, Canada, France, Germany, Hungary, Iran, Italy, Spain and Tunisia.
Dumortieria are rather similar to Grammoceras and Catulloceras from the same age, having a thin, discoidally evolute shell with simple, gently sigmoid ribbing and a low ventral keel, but this genus has a less rounded venter and Catulloceras has a subquadrate whorl section.
Species within this genus include:
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Dumortieria
Dumortieria is a genus of ammonites belonging to the family Graphoceratidae.
These cephalopods were fast-moving nektonic carnivores. They lived in the Early Jurassic, upper Toarcian age (from about 180.1 to 175.6 million years ago). Fossils of species within this genus can be found in Bulgaria, Canada, France, Germany, Hungary, Iran, Italy, Spain and Tunisia.
Dumortieria are rather similar to Grammoceras and Catulloceras from the same age, having a thin, discoidally evolute shell with simple, gently sigmoid ribbing and a low ventral keel, but this genus has a less rounded venter and Catulloceras has a subquadrate whorl section.
Species within this genus include:
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