| Urasterella | |
|---|---|
 | |
| Urasterella asperula | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Asteroidea |
| Order: | † Platyasterida |
| Family: | † Palasteriscidae |
| Subfamily: | † Urasterellinae |
| Genus: | † Urasterella McCoy (1851) |
| Species | |
see text | |
| Synonyms | |
| |
Urasterella is an extinct genus of sea stars that lived from the Ordovician to the Devonian. [1] Its fossils are known from Europe, North America and southern Africa. [1]
There have been a number of species assigned or transferred to the genus since its description in 1851. [1]
 | This prehistoric asteroidea-related article is a stub. You can help Wikipedia by expanding it. |
Iniidae is a family of river dolphins containing one living genus, Inia, and four extinct genera. The extant genus inhabits the river basins of South America, but the family formerly had a wider presence across the Atlantic Ocean.
Crassostrea is a genus of true oysters containing some of the most important oysters used for food.
The smooth snake is a species of non-venomous snake in the family Colubridae. The species is found in northern and central Europe, but also as far east as northern Iran. The Reptile Database recognizes two subspecies as being valid, including the nominotypical subspecies described here.
Coronella is a genus of harmless snakes in the family Colubridae. The genus is endemic to Europe, North Africa and West Asia. Two species are currently recognized as being valid.
Praenuculidae is an extinct family of prehistoric bivalves in the superfamily Nuculoidea. Praenuculidae species lived from the early Ordovician, Arenig stage through the Early Devonian Emsian stage. Praenuculidae fossils are found worldwide, present on every continent except Antarctica. Species in this family are thought to have been sessile, attached to the substrate in shallow infaunal marine water environments, where they formed shells of an aragonite composition. The family Praenuculidae was named by A. Lee McAlester in 1969.
Belonostomus is a genus of prehistoric ray-finned fish that was described by Louis Agassiz in 1844. It is a member of the order Aspidorhynchiformes, a group of fish known for their distinctive elongated rostrums.
Sphaerexochus is a genus of trilobite from the Middle Ordovician to Late Silurian of Asia, Australia, Europe, and North America.
Stylemys is the first fossil genus of dry land tortoise belonging to the order Testudines discovered in the United States. The genus lived in temperate to subtropical areas of North America, Europe, and Asia, based on fossil distribution. The genus was first described in 1851 by Joseph Leidy. The tortoise was common in the prehistoric Badlands, especially Nebraska and South Dakota. The species has also been found in the formations in and around Badlands National Park. Fossil fragments have also been found in the Palm Park Formation of New Mexico.
Nesodon is a genus of Miocene mammal belonging to the extinct order Notoungulata which inhabited southern South America during the Late Oligocene to Miocene living from 29.0 to 16.3 Ma and existed for approximately 12.7 million years. It had a relatively large size, weighing up to 554 kg (1221 lbs) and reaching 1.5 m in height.
Herpetotherium is an extinct genus of metatherian mammal, belonging to the possibly paraphyletic family Herpetotheriidae. Native to North America from the Eocene to Early Miocene, fossils have been found in California, Oregon, Texas, Florida, Montana, Wyoming, Colorado, North and South Dakota, Nebraska, and Saskatchewan. The oldest species, H. knighti, is dated to around 50.3 mya, and the most recent, an unnamed species, may be as recent as 15.97 mya. A morphological analysis of marsupials and basal metatherians conducted in 2007 found Herpetotherium to be the sister group to extant marsupials. It is the youngest known metatherian from North America until the migration of the Virginia opossum from South America within the last 2 million years.
Placenticeras is a genus of ammonites from the Late Cretaceous. Its fossils have been found in Asia, Europe, North and South America.
Saukiella is a genus of trilobites of the Saukiidae family.
Studeria is a genus of sea urchins in the family Neolampadidae.
Phragmolites is an extinct genus of molluscs in the family Bucaniidae, paleozoic molluscs of uncertain position possibly being either Gastropods or Monoplacophorans in the superfamily Bellerophontoidea.
Comptonia is an extinct genus of prehistoric sea stars in the family Goniasteridae. Species are from the Cretaceous of Canada (Alberta) and France. The type species, C. elegans was recovered from France.
Brachydiceratherium is an extinct genus of teleoceratine rhinocerotid that inhabited Eurasia during the Oligocene and Miocene epochs.