| Dumortieria Temporal range: | |
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| Fossil of Dumortieria jamesoni.at Haus der Natur, Salzburg | |
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| Genus: | †Dumortieria |
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Dumortieria is a genus of ammonites belonging to the family Graphoceratidae. [1]
These cephalopods were fast-moving nektonic carnivores. They lived in the Late 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.
Dumortiera 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 species has a les rounded venter and Catulloceras has a subquadrate whorl section. [2] [3]
Species within this genus include: [2]
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appeared during the Devonian, and the last species either vanished in the Cretaceous–Paleogene extinction event, or shortly after, during the Danian epoch of the Paleocene.
Dactylioceras was a widespread genus of ammonites from the Lower Jurassic period, approximately 180 million years ago (mya).
Stephanoceras is an extinct genus of Stephanoceratoid ammonite which lived during the Bajocian. It is the type genus of the family Stephanoceratidae.
Abbasites is an extinct genus of ammonites from the early Middle Jurassic epoch, included in the ammonitid family Erycitidae.
Gleviceras is an ammonite genus that lived during the Early Jurassic Period, found in Canada, Hungary, Mexico and the United Kingdom.
Epicaridea is a former suborder of isopods, now treated as part of the infraorder Cymothoida. They are ectoparasites that inhabit other crustaceans, namely ostracods, copepods, barnacles and malacostracans. The suborder is found globally. Epicaridea are generally less well researched than other isopods.
Hyperlioceras is an extinct genus of cephalopod included in the ammonitid family Graphoceratidae that lived during the Bajocian stage of the Middle Jurassic. The type species is Hyperlioceras discites
Mammites is a Late Cretaceous ammonite genus included in the acanthoceratoidean family, Acanthoceratidae, and the type genus for the subfamily Mammitinae. Mammites was named by Laube and Bruder in 1887.
Oxynoticeratidae is a family of true ammonites included in the superfamily Psiloceratoidea.
Grammoceras is an extinct genus of ammonite found in Yorks Ravenscar, England, from Jurassic period sediments. Its overall distribution is fairly worldwide.
Pleuroceras is a genus of ammonite from the lower Jurassic, upper Pliensbachian.
Graphoceratidae is an extinct family of ammonites in the order Ammonitida, which lived during the Jurassic.
Psiloceratidae is an extinct family of cephalopods belonging to the ammonite subclass.
Echioceratidae is an extinct family of ammonites that lived during Sinemurian stage of Early Jurassic.
Harpoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae. Ammonites of this subfamily had involute and compressed shells with strong keels. Keel might be rarely missing, but this is considered to be an abnormality. This has been observed both in Cleviceras and Harpoceras and called as genus Monestieria, which is now known to be invalid. Another example is Pseudolioceras, whose unkeeled specimen was used as type for description of invalid genus Praehaploceras. Oxyconic forms of this subfamily does not have any keel. Ribs were single, but in some genera also bifurcating with shapes from sigmoidal to falcate. Sometimes, shell can have only striate ribs or is smooth. Tubercules are rare. Dimorphism is known in some genera and it is observable mostly in size. Macrochons can be 4, to 6 times larger than microconchs. As an example, macroconchs of Pseudolioceras are more than 150mm in diameter, while adult microconchs are only 35-50mm. There are big size differences even within dimorphs. Specimens ca be 2, or sometimes even 3 times bigger than other specimens of same dimorph.
Lithacoceras is an extinct ammonite cephalopod genus included in the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic period, from the Oxfordian age to the Tithonian age.
Porpoceras is genus of ammonite that lived during the early and middle Toarcian stage of early Jurassic. Members of this genus existed from uppermost part of the Harpoceras serpentinum zone to the Haugia variabilis zone. Their fossils were found in Europe, Asia, North America and South America.
The subfamily Dactylioceratinae comprises early Jurassic ammonite genera that lived during Upper Pliensbachian to Upper Toarcian stage. These dactylioceratids existed from Margaritatus ammonite Zone, when they have evolved from Reynesocoeloceratinae and died out in Variabilis Zone without leaving any descendants.
Sydney Savory Buckman was a British palaeontologist and stratigrapher. He is known for his studies of extinct marine invertebrates, especially the Brachiopoda and Ammonoidea of the Jurassic era.
Mercaticeras is an extinct genus of ammonites belonging to the family Hildoceratidae.
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