Oldfieldthomasiidae
Oldfieldthomasiidae is an extinct family of notoungulate mammals known from the Late Paleocene to Late Eocene of South America. The family was classified by George Gaylord Simpson in 1945 and a synonym is Acoelodidae, defined by Florentino Ameghino in 1901.Oldfieldthomasiidae
at

Fossilworks

.org

Etymology

The family is named after British zoologist

Colbertia
''Colbertia'' is an extinct genus of oldfieldthomasiid notoungulate. It lived from the Early to the Middle Eocene, and its fossilized remains were discovered in Argentina and Brazil. Description This animal was roughly the size of a Virginia opossum, reaching approximately 50 centimeters in length excluding its tail. Its weight has been estimated to have been around 2 to 3 kilograms. ''Colbertia'' had a relatively elongated skull, with low-crowned (brachydont) molars ; the cusps of the molars were joined to form ridge-like structures called lophs, and are therefore considered lophodont. The paracone and the metacone had notable folds. The ankle bones of ''Colbertia'' indicates that it was a plantigrade, an ancestral condition within Notoungulata. The bone morphology at the base of the skull was very similar to other basal Notoungulates, although the petrous bone had distinct characteristics also found in similar but slightly more recent notoungulates, such as '' Dolichostylodo ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Dolichostylodon
''Dolichostylodon'' is an extinct species of mammal, belonging to the order Notoungulata. It lived during the Middle Eocene, and its fossilized remains were discovered in South America. Description About the size of a marmot, this animal was quite similar to other basal notoungulates such as '' Oldfieldthomasia'', '' Ultrapithecus'' and ''Colbertia'', from which it was mainly distinguished by the characteristics of its teeth. The deciduous premolars were more triangular-shaped than in ''Ultrapithecus'', the paracone was more prominent, and the deciduous third lower premolar had a well-developed metaloph. The upper molars had a very prominent parastyle and metastyle. The metacone column was wider than in ''Colbertia'', and the mesiolabial dimple was not present, while the distolabial dimple was wide and shallow. Classification ''Dolichostylodon saltensis'' was first described in 2009, based on fossil remains found in the locality El Simbola, in the Salta Province of Argentina. ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Typotheres
Typotheria is a suborder of the extinct mammalian order Notoungulata and includes five families: Archaeopithecidae, Campanorcidae, Interatheriidae, Mesotheriidae, and Oldfieldthomasiidae. CifelliCifelli, Richard L. 1993. The phylogeny of the native South American ungulates. pp. 195-216 ''in'' F. S. Szalay, M. J. Novacek and M. C. McKenna (''eds.'') ''Mammal Phylogeny, Volume 2, Placentals''. Springer-Verlag, New York. indicated that Typotheria would be paraphyletic if it excluded members of the suborder Hegetotheria and he advocated inclusion of the hegetothere families Archaeohyracidae and Hegetotheriidae Hegetotheriidae is an extinct family of notoungulate mammals known from the Oligocene through the Pliocene of South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a r ... in Typotheria. References Prehistoric animal suborders Mammal suborders {{paleo-mammal-stub ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Ultrapithecus
''Ultrapithecus'' is an extinct genus of oldfieldthomasiid notoungulate that lived during the Middle Eocene of what is now Argentina. Description This genus is mostly known from its dentition, and a detailed reconstruction is impossible. It can be supposed that ''Ultrapithecus'' was, like its better known relatives, similar in size and appearance with a modern marmot. Its dentition consisted of low-crowned (brachydont) teeth. The molars were devoid of mesostyle, while the premolars lacked the fold of the metacone. Classification The genus ''Ultrapithecus'' was first described in 1901 by Florentino Ameghino, based on fossil remains found in Argentine terrains dated from the end of the Middle Eocene. Ameghino described two species, ''Ultrapithecus rutilans'' and ''U. rusticulus'', and thought that this genus was an archaic primate, hence its genus name, ''Ultrapithecus'', meaning "monkey from the other side", referring to its discovery in South America instead of the Old ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Xenostephanus (mammal)
''Xenostephanus'' may refer to: * preoccupied synonym (1963) of '' Zenostephanus'', an ammonite genus * ''Xenostephanus'' (mammal) (1962), a genus of notoungulates in the family Oldfieldthomasiidae Oldfieldthomasiidae is an extinct family of notoungulate mammals known from the Late Paleocene to Late Eocene of South America. The family was classified by George Gaylord Simpson in 1945 and a synonym is Acoelodidae, defined by Florentino Ameghi ...

Paginula
''Paginula'' is an extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ... genus of oldfieldthomasiid notoungulate. It lived during the Eocene in what is now Argentina.Notices préliminaires sur des ongulés nouveaux des terrains crétacés de Patagonie reliminary notes on new ungulates from the Cretaceous terrains of Patagonia ''Boletín de la Academia Nacional de Ciencias de Córdoba'' 16:349-429 References Typotheres Eocene mammals of South America Paleogene Argentina Fossils of Argentina Fossil taxa described in 1901 Taxa named by Florentino Ameghino Prehistoric placental genera Golfo San Jorge Basin Sarmiento Formation {{paleo-mammal-stub ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Oldfieldthomasia
''Oldfieldthomasia'' is an extinct genus of Notoungulate, probably related to the suborder Typotheria. It lived during the Middle Eocene, in what is today South America. Description This animal was approximately the size of a marmot, and probably superficially resembled a rodent. The 10 centimeters long skull was rather low and had an elongated muzzle ; the orbits, of large dimension, were posteriorly opened and located in the posterior area of the skull. The zygomatic apophysis was rather slender. The posterior part of ''Oldfieldthomasia debilitata'' was closely studied by George Gaylord Simpson in 1936, through the realization of 55 very thin sections ; the study highlighted numerous cranial characteristics, such as the relationships between the various cavities. The tympanic and hypotympanic cavities were not separated and were devoid of spongy tissue ; the path of the pneumatic orifice can be followed between the epitympanic recess and the epitympanic sinus, filling free, an ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Notoungulata
Notoungulata is an extinct order of mammalian ungulates that inhabited South America from the early Paleocene to the Holocene, living from approximately 61 million to 11,000 years ago. Notoungulates were morphologically diverse, with forms resembling animals as disparate as rabbits and rhinoceroses. Notoungulata are the largest group of South American native ungulates, with over 150 genera in 14 families having been described, divided into two major subgroupings, Typotheria and Toxodontia. Notoungulates first diversified during the Eocene. Their diversity declined during the Late Neogene, with only the large toxodontids persisting until the end of the Pleistocene. Collagen analysis suggests that notoungulates are closely related to litopterns, another group of South American ungulates, and their closest living relatives being perissodactyls (odd-toed ungulates), including rhinoceroses, tapirs and equines. but their relationships to other South American ungulates are uncertain. Se ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Allalmeia
''Allalmeia'' was a small notoungulate mammal of around 3 kilograms. It lived in Mendoza Province, Argentina (Divisadero Largo Formation) during the Late Eocene. ''Allalmeia'' belonged to the Oldfieldthomasiidae family within the suborder Typotheria.''Allalmeia''
at

Fossilworks

.org

Description

It was a small mammal, with and lophobunodont teeth, teeth that have a combination of ridges (

Prehistoric Mammal Families
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. T ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opini ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Fossilworks
Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Pale ..., a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was created in 1998 by John Alroy and is housed at Macquarie University. It includes many analysis and data visualization tools formerly included in the Paleobiology Database.{{cite web, title=Frequently asked questions, url=http://www.fossilworks.org/cgi-bin/bridge.pl?page=FAQ, publisher=Fossilworks, access-date=17 December 2021 References {{Reflist External links {{Wikidata property, P842 * [Baidu]