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Joseph John Sepkoski Jr. was a University of Chicago paleontologist. Sepkoski studied the fossil record and the diversity of life on Earth. Sepkoski and David Raup contributed to the knowledge of extinction events. They suggested that the extinction of dinosaurs 66 mya was part of a cycle of mass extinctions that may have occurred every 26 million years.
In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.3 Ma to around 168.3 Ma. The Bajocian age succeeds the Aalenian age and precedes the Bathonian age.
Aulacostephanus is an extinct ammonoid cephalopod genus from the Upper Jurassic Tithonian belonging to the perisphinctacean family Aulacostephanidae.
Eudmetoceras is an extinct genus from a well-known class of fossil cephalopods, the ammonites. It lived during the Jurassic Period, which lasted from 171.6 to 168.4 million years ago.
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
Tselfatia is an extinct genus of prehistoric bony fish. It has been discovered in Texas and Germany. The type species, Tselfatia formosa, was named and described in 1944 by French paleontologist Camille Arambourg.
Phylloceras is an extinct genus of ammonoid cephalopods belonging to the family Phylloceratidae. These nektonic carnivores lived from Early Jurassic to Late Cretaceous.
Saxoceras is a genus of very evolute schlotheimiid ammonoids from the Lower Jurassic.
Harpoceras is an extinct genus of cephalopod belonging to the family Hildoceratidae. These cephalopods existed in the Jurassic period, during Toarcian age from Falciferum zone to Commune subzone of Bifrons zone. They were fast-moving nektonic carnivores.
Parkinsoniidae is a family of ammonites belonging to the order Ammonitida. The cephalopod family lived from the Bajocian stage to the Bathonian age of the Middle Jurassic.
Parkinsonia is a genus of ammonites belonging to the family Parkinsoniidae.
Reynesocoeloceras is genus of ammonite that lived during the lower Pliensbachian stage of early Jurassic, ammonite zones Ibex—Davoei.
Reynesoceras is genus of ammonites that lived during the upper Pliensbachian stage of early Jurassic. It has evolved from Prodactylioceras, or Cetonoceras. Dactylioceras (Eodactylites) has probably evolved from this genus. Aveyroniceras is a name for macroconchs of this genus. Their fossils were found in Europe, northern Africa, Asia, North America and South America.
Raimondiceras Upper Jurassic ammonite belonging to the ammonitida family.
Rasenoides is a flat sided, evolute, radially ribbed Lower Jurassic ammonite belonging to the ammonitida.
Reineckeites is a Lower Jurassic ammonite belonging to the ammonitid.
Riasanites is an Upper Jurassic ammonite belonging to the ammonitid.
Ringsteadia is a Jurassic ammonite belonging to the ammonitid.
Rollerites is a Jurassic ammonite belonging to the ammonitid.
Rollieria is a Jurassic ammonite belonging to the ammonitid.
References
- Notes
- ↑ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database" . Retrieved 2017-10-16.
- 1 2 Paleobiology Database - Rursiceras. 2017-10-16.
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