|
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 the United Kingdom. Genera Subfamily Graphoceratinae Buckman, 1905 * '' Brasilia'' * ''Graphoceras'' * ''Hyperlioceras'' * '' Ludwigia'' Subfamily Leioceratinae Spath, 1936 * '' Canavarella'' * '' Costileioceras'' * '' Vaceckia'' * '' Leioceras'' * '' Staufenia'' * '' Ancolioceras'' Subfamily Dumortieriinae Haug, 1885 * ''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 Late Jurassic, upper Toarcian age (from about 180.1 to 175.6 million years ...'' * '' Pleydellia'' * '' Catulloceras'' * '' Cotteswoldia'' * '' Walkericeras'' * '' Canavarina'' * '' Paradumortieria'' Subfamily Tmetoceratin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ludwigia (ammonite)
''Ludwigia'' is an extinct genus of ammonites in the family Graphoceratidae, which lived during the Middle Jurassic. Species *''L. murchisonae'' Sowerby, 1825, which has an elaborate ribbing and a strong ridge along the dorsal surface of the shell. Distribution Fossils of ''Ludwigia murchisonae'' are found in the Jurassic marine strata of France, Germany, Hungary, Spain and the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North .... References External links BiolibEncyclopaedia of Life Middle Jurassic ammonites of Europe Aalenian life Hildoceratoidea Ammonitida genera {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 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. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graphoceras
''Graphoceras'' is an extinct Ammonitida, ammonite genus included in the hildoceratacean family Graphoceratidae that lived during the Aalenian and Bajocian stages, Middle Jurassic in what is now Europe, north Africa, and Iran. ''Graphoceras'' produced a compressed, involute shell with a raised umbilical edge and sinuous ribbing. References * Arkell ''et al.'', 1957. Mesozoic Ammonoidea (L264), Treatise on Invertebrate Paleontology Part L. Geological Society of America and University of Kansas Press. Middle Jurassic ammonites Ammonites of Europe Hildoceratoidea Ammonitida genera {{Ammonitina-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyperlioceras
''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'' (Waagen, 18567) Morphology The shell of ''Hyperlioceras'' is very compressed and involute, with a tall persistent keel and a deep umbilicus. Biostratigraphic significance The International Commission on Stratigraphy (ICS) has defined the base of the Bajocian Stage of the Jurassic as the lowest occurrence of the genus ''Hyperlioceras'', at 170.3 ± 1.4 million years ago, which defines base of the ''Hyperlioceras discites'' Zone. This point also marks the end of the preceding Aalenian The Aalenian () is a subdivision of the Middle Jurassic Epoch/Series of the geologic timescale that extends from about 174.1 Ma to about 170.3 Ma (million years ago). It was preceded by the Toarcian and succeeded by the Bajocian. Stratigraphic ... Stage. The upper boundary of the Bajocian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |