title: Dumortieria
text: # Dumortieria
  
  Dumortieria is a genus of ammonites belonging to the family Graphoceratidae.
  
  ## Fossil record
  
  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.
  
  ## Description
  
  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.
  
  ## Species
  
  Species within this genus include:
  
  * 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
  