Proterotheriids and macraucheniids (Litopterna: Mammalia) from the Pampa Castillo Fauna, Chile (early Miocene, Santacrucian SALMA) and a new phylogeny of Proterotheriidae

McGrath, Andrew J.; Flynn, John J.; Wyss, André R.

doi:10.1080/14772019.2019.1662500

Cited by 20 publications

(69 citation statements)

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“…Better characterizing faunal similarities between the Pinturas Formation of Argentina and the Galera Formation/Pampa Castillo fauna would help justify formally recognizing "Pinturan" as a distinct SALMA or a "subage" of the Santacrucian, if it can be clearly determined to be temporally and faunally distinct from core Santacrucian faunas. The cavioid, chinchilloid, and erethizontoid rodents of Pampa Castillo support its assignment to the Santacrucian SALMA, in agreement with previous work (Flynn et al, 2002a;McGrath et al, 2020). We also agree with the earlier observation by Chick et al (2010) that the Pampa Castillo rodent community shares certain similarities to that of the ImPF which some authors recognize as the characteristic fauna of a distinct but as yet not formalized biochronologic interval, the "Pinturan."…”

Section: Paleoenvironmental Implicationssupporting

confidence: 93%

“…brates from underlying marine strata, a list and brief description of the fossil mammal fauna, and a detailed description of the palaeothentid marsupials. They assigned the mammalian fauna to the Santacrucian SALMA based on the presence of characteristic taxa such as Nesodon Owen, 1846, Perimys Ameghino, 1887a, and Homalodotherium Flower, 1873. McGrath et al (2020 described the litopterns from Pampa Castillo, finding them consistent with assignment to the Santacrucian SALMA.…”

Section: @ Ufzgbmentioning

confidence: 90%

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Cavioids, Chinchilloids, and Erethizontoids (Hystricognathi, Rodentia, Mammalia) of the Early Miocene Pampa Castillo Fauna, Chile

McGrath

Chick

Croft

et al. 2022

American Museum Novitates

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Caviomorph rodents became important components of South American faunas after their Eocene arrival from Africa. Here we describe the cavioid, chinchilloid, and erethizontoid caviomorphs of the early Miocene Pampa Castillo fauna of southern Chile. This fauna's age and location make it key for resolving outstanding biostratigraphic questions concerning early Miocene Patagonian fossiliferous strata.Each of the four major caviomorph clades ("superfamilies") is represented in the Pampa Castillo fauna, three whose members are detailed here: cavioids (3 genera; 3 species), chinchilloids (3 genera; 6 species), and erethizontoids (2 genera; 2 species).Abundantly represented taxa, e.g., Neoreomys australis, Perimys erutus, and Prolagostomus pusillus, corroborate previous work assigning the Pampa Castillo fauna to the Santacrucian South American Land Mammal "Age" (SALMA; inclusive of the "Pinturan"). Several taxa, including Eosteiromys, Perimys intermedius, and Perimys sp. nov.?, are also found in the lower and middle Pinturas Formation (ImPF) but not "core" Santacrucian faunas (from the Santa Cruz Formation [SCF] along the Rio Santa Cruz and Atlantic coast), suggesting a distinctive

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Section: Paleoenvironmental Implicationssupporting

confidence: 93%

Section: @ Ufzgbmentioning

confidence: 90%

Cavioids, Chinchilloids, and Erethizontoids (Hystricognathi, Rodentia, Mammalia) of the Early Miocene Pampa Castillo Fauna, Chile

McGrath

Chick

Croft

et al. 2022

American Museum Novitates

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“…Comments. The genus Thoatherium has been recorded in the SCF (early-middle Miocene) of Santa Cruz Province at Río Santa Cruz (Schmidt et al, 2019), Río Chalía (Cuitiño et al, 2021;Monsalvo et al, 2021), and the Atlantic coastal localities (Cassini et al, 2012), and in the Galera Formation (early Miocene), Pampa Castillo, Aisén Region of Chile (McGrath et al, 2020). MPM-PV 19150 is comparable in size to Thoatherium minusculum and Tetramerorhinus lucarius, but smaller than Anisolophus floweri.…”

Section: Paleontologymentioning

confidence: 97%

Fossil vertebrates of the early-middle Miocene Cerro Boleadoras Formation, northwestern Santa Cruz Province, Patagonia, Argentina

Vizcaı́no

Bargo

Pérez

et al. 2022

andgeo

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The early–middle Miocene continental Cerro Boleadoras Formation (CBF) crops out in the area of Cerro Boleadoras and Cerro Plomo on the western slope of the Meseta del Lago Buenos Aires, northwestern Santa Cruz Province, Argentina. The lower levels of the CBF consist of laterally extensive medium to pebbly sandstone beds with trough cross-bedding, interpreted as fluvial channel deposits, interbedded with tabular fine-grained floodplain deposits. Recent fieldwork provided fossil vertebrates from these levels with an estimated age between ~16.5 Ma and 15.1 Ma (late Burdigalian-early Langhian). The studied section temporally overlaps with the middle or upper sections of the Santa Cruz Formation (SCF) in the Austral–Magallanes Basin of southern Patagonia, the Río Frias Formations in Chile, and the lower Collón-Curá Formation of northern Patagonia. We compile an integrated faunal list for this locality, including specimens from previous collections, and discuss its chronological and paleoenvironmental implications. The taxa list includes most of the groups recorded in the SCF: one anuran, three birds, and at least 33 mammals (metatherians, xenarthrans, litopterns, notoungulate typotheres and caviomorph rodents), indicating a Santacrucian age sensu lato. We also recorded a testudine, which constitutes the southernmost record of tortoises in South America and worldwide. Faunal differences between the vertebrate fossil content of the CBF and the mentioned sections of the Santa Cruz, Río Frías and Collón-Curá formations may reflect ecologic, climatic and geographic differences rather than temporal ones. The co-occurrence of arboreal or semiarboreal, browsing, frugivorous, and grazing mammals suggests the presence of both trees and open environments for the area occupied by the CBF rocks. However, it is not possible to discern whether these two environments coexisted or alternated, and whether one environment predominated over the other. Marker taxa, such as the chinchillid rodents Prolagostomus and Pliolagostomus, and the typothere Pachyrukhos indicate a trend to aridification during the Miocene in southern Patagonia, as previously reported for the upper part of the SCF along the Río Santa Cruz and south to the Río Coyle, along the Atlantic coast and the Río Gallegos.

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“…During the Santacrucian, Proterotheriidae have been reported to include as many as seven genera and 13 species (Villafañe et al, 2006;Ubilla et al, 2011). In contrast, Macraucheniidae is represented by one genus with several species (Scott, 1910;Croft et al, 2004;Cassini et al, 2012;Schmidt and Ferrero, 2014;McGrath et al, 2018McGrath et al, , 2019.…”

Section: Litopterna Are Conspicuous Representatives Of Santa Cruzmentioning

confidence: 99%

Litopterna (Mammalia) From the Santa Cruz Formation (Early-Middle Miocene) at the Río Santa Cruz, Southern Argentina

Schmidt

Pino

Muñoz

et al. 2020

PEAPA

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Litopterna from fossiliferous exposures of the Santa Cruz Formation (Early-Middle Miocene) along the Río Santa Cruz, Patagonia Argentina, are analyzed and described. In the prospected localities, known as Barrancas Blancas (Estancia Aguada Grande and Estancia Santa Lucía) and Segundas Barrancas Blancas (Estancia Cordón Alto and Estancia El Tordillo), specimens belonging to the families Proterotheriidae and Macraucheniidae were recorded. Within Proterotheriidae, the species Anisolophus australis, A. floweri, Tetramerorhinus lucarius, Te. cingulatum, Thoatherium minusculum and Diadiaphorus majusculus have been identified. Macraucheniidae are scarcer and represented by Theosodon sp. Although the systematics of litopterns of the Santa Cruz Formation requires a review, the new remains from the Río Santa Cruz reported here, as well as others recently recovered from the same unit in the Atlantic coast, will be valuable to clarify the taxonomy of this peculiar group of South American extinct ungulates.

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Proterotheriids and macraucheniids (Litopterna: Mammalia) from the Pampa Castillo Fauna, Chile (early Miocene, Santacrucian SALMA) and a new phylogeny of Proterotheriidae

Cited by 20 publications

References 58 publications

Cavioids, Chinchilloids, and Erethizontoids (Hystricognathi, Rodentia, Mammalia) of the Early Miocene Pampa Castillo Fauna, Chile

Cavioids, Chinchilloids, and Erethizontoids (Hystricognathi, Rodentia, Mammalia) of the Early Miocene Pampa Castillo Fauna, Chile

Fossil vertebrates of the early-middle Miocene Cerro Boleadoras Formation, northwestern Santa Cruz Province, Patagonia, Argentina

Litopterna (Mammalia) From the Santa Cruz Formation (Early-Middle Miocene) at the Río Santa Cruz, Southern Argentina

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