''Dumortieria'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
ammonites
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
belonging to the family
Graphoceratidae
Graphoceratidae is an extinct family of ammonites in the order Ammonitida, which lived during the Jurassic.
Distribution
Fossils are found in the Jurassic marine strata of Canada, France, Germany, Hungary, Italy, Morocco, Saudi Arabia, Spain and ...
.
Fossil record
These cephalopods were fast-moving nektonic carnivores. They lived in the
Early Jurassic
The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassicâ ...
, upper
Toarcian
The Toarcian is, in the International Commission on Stratigraphy, ICS' geologic timescale, an age (geology), age and stage (stratigraphy), stage in the Early Jurassic, Early or Lower Jurassic. It spans the time between 184.2 Megaannum, Ma (million ...
age (from about 180.1 to 175.6 million years ago). Fossils of species within this genus can be found in
Bulgaria
Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...
,
Canada
Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...
,
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
,
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
,
Hungary
Hungary is a landlocked country in Central Europe. Spanning much of the Pannonian Basin, Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and ...
,
Iran
Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
,
Italy
Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
,
Spain
Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
and
Tunisia
Tunisia, officially the Republic of Tunisia, is a country in the Maghreb region of North Africa. It is bordered by Algeria to the west and southwest, Libya to the southeast, and the Mediterranean Sea to the north and east. Tunisia also shares m ...
.
Description
''Dumortieria'' are rather similar to ''
Grammoceras
''Grammoceras'' is an extinct genus of Ammonitida, ammonite found in Yorks Ravenscar, England, from Jurassic period sediments. Its overall distribution is fairly worldwide.
''Grammoceras'' has a thin, discoidally evolute shell with simple, gent ...
'' 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.
[Sepkoski Online]
/ref>
Species
Species within this genus include:[Fossilworks]
/ref>
* ''Dumortieria brancoi'' Benecke 1905
* ''Dumortieria costula'' Reinecke 1818
* ''Dumortieria gundershofensis'' Haug 1887
* ''Dumortieria insignisimilis'' Braun 1867
* ''Dumortieria jamesoni'' (Sow.)
* ''Dumortieria kochi'' Benecke 1905
* ''Dumortieria latumbilicata'' Geczy 1967
* ''Dumortieria levesquei'' d'Orbigny 1844
* ''Dumortieria meneghinii'' Zittel 1887
* ''Dumortieria moorei'' Lycett 1857
* ''Dumortieria prisca'' Buckman 1891
* ''Dumortieria pseudoradiosa'' Branco 1879
* ''Dumortieria radians'' Reinecke 1818
* ''Dumortieria radiosa'' Seebach 1864
* ''Dumortieria rustica'' Buckman 1902
* ''Dumortieria sparsicosta'' Haug 1887
* ''Dumortieria striatulocostata'' Quenstedt 1885
* ''Dumortieria tabulata'' Buckman 1892
See also
*List of ammonite genera
This list of ammonites is a comprehensive listing of Genus, genera that are included in the subclass †Ammonoidea, excluding purely vernacular terms. The list includes genera that are commonly accepted as valid, as well as those that may be inval ...
References
{{Taxonbar, from=Q9212928
Hildoceratidae
Ammonitida genera