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 . Fossils of species within this genus can be found in Bulgaria, Canada, France, Germany, Hungary, Iran, Italy, Spain and Tunisia.
Description
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
Species within this genus include:Dumortieria brancoi Benecke 1905Dumortieria costula Reinecke 1818Dumortieria gundershofensis Haug 1887Dumortieria insignisimilis Braun 1867Dumortieria jamesoni Dumortieria kochi Benecke 1905Dumortieria latumbilicata Geczy 1967Dumortieria levesquei d'Orbigny 1844Dumortieria meneghinii Zittel 1887Dumortieria moorei Lycett 1857Dumortieria prisca Buckman 1891Dumortieria pseudoradiosa Branco 1879Dumortieria radians Reinecke 1818Dumortieria radiosa Seebach 1864Dumortieria rustica Buckman 1902Dumortieria sparsicosta Haug 1887Dumortieria striatulocostata Quenstedt 1885Dumortieria tabulata Buckman 1892