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Victorlemoinea
''Victorlemoinea'' is an extinct litoptern genus of the family Sparnotheriodontidae, that lived from the Early to Middle Eocene. Fossils of ''Victorlemoinea'' have been found in the Las Flores, Sarmiento and Koluel Kaike Formations of Argentina, the Itaboraí Formation of Brazil and La Meseta Formation, Antarctica.''Victorlemoinea'' at .org Description ''Victorlemoinea'' was a medium-sized litoptern. '' Sparnotheriodon'', ''Victorlemoinea'', and one species of '' |
Sparnotheriodontidae
Sparnotheriodontidae is an enigmatic extinct family of litopterns known primarily from teeth. Sparnotheriodontids are one of two South American native ungulate clades known to have reached Antarctica, the other being astrapotheres. Description Sparnotheriodontids ranged in size from the mid-sized ''Phoradiadus'' to the large ''Sparnotheriodon''. ''Sparnotheriodon'' and one species of ''Notiolofos'', ''N. arquinotiensis'', have been estimated to have had masses of roughly . Another species of ''Notiolofos'', ''N. regueroi'', was smaller, with a body mass estimated to have been between 25 and 58 kg. Classification The phylogenetic position of Sparnotheriodontidae is uncertain. Most researchers consider them to belong to Litopterna. In contrast, Cifelli and Bergqvist have argued that sparnotheriodontids are condylarths. Their methodology, based on attempting to associate isolated teeth and isolated postcranial bones based on size and relative abundance, has been criticized. Phylo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itaboraian
The Itaboraian ( pt, Itaboraiense) age is a period within the Early Eocene geologic time (53.0–50.0 Mya (unit), Ma) epoch of the Paleogene, used more specifically with South American land mammal ages (SALMA). It follows the Riochican and precedes the Casamayoran age. Etymology This age is named after the Itaboraí Formation in the Itaboraí Basin in Itaboraí, a Rio de Janeiro metropolitan area, Greater Rio municipality in the state of Rio de Janeiro (state), Rio de Janeiro in Brazil not very far away from Niterói. Formations Fossils Correlations References Bibliography ;Itaboraí Formation * * * * * * ;Bogotá Formation * * * ;Cerrejón Formation * * * * * * * * * * * * * ;Chota Formation * * ;Las Flores Formation * * * ;Koluel Kaike Formation * ;Maíz Gordo Formation * ;Mogollón Formation * * ;Muñani Formation * ;Peñas Coloradas Formation * * ;Río Loro Formation * {{SALMA Itaboraian, Paleocene Sout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Itaboraí Formation
The Itaboraí Formation ( pt, Formação Itaboraí) is a highly list of fossiliferous stratigraphic units in Brazil, fossiliferous geologic Formation (geology), formation and LagerstätteKellner & Campos, 1999, p.399 of the Itaboraí Basin in Rio de Janeiro (state), Rio de Janeiro, southeastern Brazil. The formation reaching a thickness of is the defining unit for the Itaboraian South American land mammal age (SALMA), dating to the Eocene, Early Eocene, approximately 53 to 50 Ma. The formation is restricted to the Itaboraí Basin, a minibasin of around the city of Itaboraí, northeast of Rio de Janeiro, and comprises limestones, marls and lignites, deposited in an alluvial to lacustrine depositional environment, environment, dominated by heavy rainfall. The formation overlies Precambrian basement (geology), basement and is overlain by Early Eocene basalts and Late Eocene to Early Oligocene conglomerate (geology), conglomerates. The up to thick formation has provided many fossi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sparnotheriodon
''Sparnotheriodon'' is an extinct genus of sparnotheriodontid litoptern that lived during the Middle Eocene of what is now Argentina, leaving fossils in the Sarmiento Formation. Description ''Sparnotheriodon'' was a medium-sized litoptern. ''Sparnotheriodon'', ''Victorlemoinea'', and one species of ''Notiolofos'', ''N. arquinotiensis'', have been estimated to have had masses of roughly , whereas another species of ''Notiolofos'', ''N. regueroi'', was smaller, with a body mass estimated between 25 and 58 kg, making them one of the largest litopterns of the Paleogene. Litopterns reached such sizes again in the Miocene. Taxonomy ''Sparnotheriodon'' was first named by Miguel Fernando Soria in 1980 on the basis of a mandible and teeth from the Sarmiento Formation of Argentina, with the type species being ''Sparnotheriodon epsilonoides''. In 1983, Richard Cifelli tentatively synonymized ''Sparnotheriodon'' with ''Victorlemoinea ''Victorlemoinea'' is an extinct litoptern genus of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Litoptern
Litopterna (from grc, λῑτή πτέρνα "smooth heel") is an extinct order of fossil hoofed mammals from the Cenozoic era. The order is one of the five great orders of South American ungulates that were endemic to the continent, until the Great American Biotic Interchange brought new ungulate species. Like other endemic South American mammals, their relationship to other mammal groups had long been unclear, but recent genetic and proteomic evidence indicates that their closest living relatives are Perissodactyls (odd-toed ungulates) including horses, rhinoceros, and tapirs, and that litopterns are closely related to notoungulates, another widespread group of South American ungulates. There were two major groups of litopterns: Proterotheriidae and Macraucheniidae. Proterotheriids were medium to large animals that evolved adaptations for fast running, and occupied a variety of niches that elsewhere were filled by animals such as goats and antelopes, mouse deer, and hors ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notiolofos
''Notiolofos'' is an extinct genus of sparnotheriodontid ungulate from the order Litopterna. The animal lived during the Eocene, in modern-day Antarctica. The genus contains two species, ''N. arquinotiensis'', the type species, and ''N. regueroi''. Description ''Notiolofos'' was originally named in 2006 by Bond ''et al.'', as '' Notolophus arquinotiensis'', on the basis of a few fossil teeth. However, after the genus was named, it became clear that the name ''Notolophus'' was already in use by a genus of moths, and the genus name was subsequently changed to ''Notiolofos'' by Bond ''et al.'' in 2009. The second species in the genus, ''Notiolofos regueroi'', was named in 2017 by Gelfo, Lopéz & Santillana, based on a single fossil molar. Fossils of ''N. arquinotiensis'' have been found in multiple layers of the La Meseta Formation of Seymour Island, Antarctica, and are dated from 55 to 34 million years ago. However, ''N. regueroi'' is only known from the Cucullaea I layer from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarmiento Formation
The Sarmiento Formation (Spanish: ''Formación Sarmiento''), in older literature described as the Casamayor Formation, is a geological formation in Chubut Province, Argentina, in central Patagonia, which spans around 30 million years from the mid-Eocene to the early Miocene. It predominantly consists of pyroclastic deposits, which were deposited in a semi-arid environment. It is divided up into a number of members. The diverse fauna of the Sarmiento Formation, including a variety of birds, crocodilians, turtles and snakes, also includes many mammals such as South American native ungulates (notoungulates, litopterns, astrapotheres) as well as armadillo Armadillos (meaning "little armored ones" in Spanish) are New World placental mammals in the order Cingulata. The Chlamyphoridae and Dasypodidae are the only surviving families in the order, which is part of the superorder Xenarthra, along wi ...s, and caviomorph rodents. Material was copied from this source, which is availabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Meseta Formation
The La Meseta Formation is a sedimentary sequence deposited during the Eocene. The formation is found on Seymour Island, Antarctica. Description La Meseta Formation lies unconformably on the Cretaceous Lopez de Bertodano Formation. It is an approximately thick sequence of poorly consolidated sandstones and siltstones. The depositional environment was probably coastal, deltaic or estuarine in character. The top of the sequence is an erosional unconformity to Pleistocene glacial gravels. La Meseta Formation is one of the sequences that make up the fill of the Late Jurassic to Paleogene James Ross Basin. Fossil content La Meseta Formation is extremely rich in fossils. Among mammals, the meridiungulata ''Antarctodon'' and ''Trigonostylops'' have been found in the formation.''Antarctodon'' at Fossilworks.org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Museum Novitates
''American Museum Novitates'' is a peer-reviewed academic journal published by the American Museum of Natural History. It was established in 1921. According to the ''Journal Citation Reports'', the journal has a 2013 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 1.636. References External links * Publications established in 1921 Open access journals American Museum of Natural History English-language journals Zoology journals Paleontology journals Geology journals Academic journals published by museums 1921 establishments in the United States {{paleontology-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
