| Proplatyarthrus | |
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| Talus bone of Proplatyarthrus | |
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| Genus: | † Proplatyarthrus Ameghino 1905 |
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Proplatyarthrus is an extinct genus of ground sloths of the family Megalonychidae, endemic to Chubut Province, Argentina in South America. [1]
Proplatyarthrus was named and a talus bone described by Florentino Ameghino in 1905. [2] It was assigned to Megalonychidae by Carroll in 1988. [3]
Florentino Ameghino was an Argentine naturalist, paleontologist, anthropologist and zoologist, whose fossil discoveries on the Argentine Pampas, especially on Patagonia, rank with those made in the western United States during the late 19th century. Along with his two brothers –Carlos and Juan– Florentino Ameghino was one of the most important founding figures in South American paleontology.
Clasmodosaurus is a genus of titanosaurian sauropod dinosaur from the Bajo Barreal Formation. It lived during the Late Cretaceous in what is now Argentina. It is known only from three fossilized teeth, and is therefore a tooth taxon. It is a nomen dubium.
Loncosaurus was a highly dubious genus of ornithopod dinosaur from the Upper Cretaceous of Provincia de Santa Cruz, Argentina. The type species is Loncosaurus argentinus, described by the famous Argentinian paleontologist Florentino Ameghino, but is considered a dubious name. Details on this animal are often contradictory, befitting a genus that was long confused for a theropod.
Cramauchenia is an extinct genus of litoptern South American ungulate. Cramauchenia was named by Florentino Ameghino. The name has no literal translation. Instead, it is an anagram of the name of a related genus Macrauchenia. This genus was initially discovered in the Sarmiento Formation in the Chubut Province, in Argentina, and later it was found in the Chichinales Formation in the Río Negro Province and the Cerro Bandera Formation in Neuquén, also in Argentina, in sediments assigned to the SALMA Colhuehuapian. In 1981 Soria made C. insolita a junior synonym of C. normalis. A specimen of C. normalis was described in 2010 from Cabeza Blanca in the Sarmiento Formation, in sediments assigned to the Deseadan SALMA.
Palaeospheniscus bergi is a species of the extinct penguin genus Palaeospheniscus. It stood about 60 to 75 centimetres high in life, or somewhat smaller on average than the extant African penguin.
Astrapotheria is an extinct order of South American and Antarctic hoofed mammals that existed from the late Paleocene to the Middle Miocene, 59 to 11.8 million years ago. Astrapotheres were large and rhinoceros-like animals and have been called one of the most bizarre orders of mammals with an enigmatic evolutionary history.
The La Plata Museum is a natural history museum in La Plata, Argentina. It is part of the Facultad de Ciencias Naturales y Museo of the UNLP.
Octodontotherium is an extinct genus of ground sloth of the family Mylodontidae, endemic to South America during the Oligocene-Early Miocene (Deseadan). It lived from 29 to 21 mya, existing for approximately 8 million years.
Orophodon is an extinct genus of ground sloth of the family Mylodontidae, endemic to Argentina, South America.
Astrapotheriidae is an extinct family of herbivorous South American land mammals that lived from the Late Eocene to the Middle Miocene 37.71 to 15.97 million years ago. The most derived of the astrapotherians, they were also the largest and most specialized mammals in the Tertiary of South America. There are two sister taxa: Eoastrapostylopidae and Trigonostylopidae.
Liptornis is a genus of fossil birds of uncertain affinities. The type species is L. hesternus. It was described by Argentine palaeontologist Florentino Ameghino in 1894 from a large cervical vertebra from the Middle Miocene Santa Cruz Formation of Patagonia. At the time, it was referred to the Pelecanidae, though this is questionable. In his 1933 palaeornithological review, Lambrecht referred it only to the superfamily Sulides without placing it in a family. A later study has suggested family Anhingidae.
Albertogaudrya is an extinct genus of astrapotherian mammal that lived in present-day Salta, Argentina during the Eocene 48.6 to 37.2 million years ago. Fossils of Albertogaudrya have been found in the Lumbrera and Sarmiento Formations. It is named after French palaeontologist Albert Gaudry.
Astraponotus is an extinct genus of herbivorous mammals, belonging to the family of astrapotherids. It lived during the late Late Eocene and its fossil remains have been found in the Sarmiento Formation of Argentina, South America.
Notocetus is an extinct genus of river dolphin belonging to Squalodelphinidae. Known specimens have been found in Early Miocene marine deposits from Argentina, Italy and Peru.
Utaetus is an extinct genus of mammal in the order Cingulata, related to the modern armadillos. The genus contains a single species, Utaetus buccatus. It lived in the Late Paleocene to Late Eocene and its fossil remains were found in Argentina and Brazil in South America.
Proschismotherium is an extinct genus of ground sloth of the family Megatheriidae, endemic to Argentina during the Early Miocene. It lived from 17.5 mya — 16.3 mya, existing for approximately 1.2 million years. The type, and only, species, P. oppositum, was named in 1902 by Florentino Ameghino based on a single specimen found in the Santacrucian-aged Colpodon Beds of Argentina. Ameghino in 1902 placed Proschismotherium in the Megatheriidae, alongside Hapaloides, which was its sister taxon.
Ernestokokenia is an extinct genus of mammal, belonging to the Didolodontidae. It lived during the Early Eocene and the Middle Eocene, and its fossils were discovered in South America.
Paulogervaisia is an extinct genus of mammal, belonging to the family Didolodontidae. Its fossilized remains have been found in South America.
Polymorphis is an extinct genus of mammal, belonging to the order Litopterna. It lived during the Eocene in South America.
Ancylocoelus is an extinct genus of mammal, belonging to the order Notoungulata. It lived during the Late Oligocene, in what is today Argentina, in South America.
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