Xenarthra (Mammalia) from a new late Neogene fossiliferous locality in Northwestern Argentina

Zurita, Alfredo Eduardo; Camacho, María Dolores Polo; Miño-Boilini, Ángel R.; Candela, Adriana Magdalena; Cuadrelli, Francisco; Krmpotic, Cecilia Mariana; Solís, Natalia

doi:10.1016/j.jsames.2017.09.023

Cited by 10 publications

(20 citation statements)

References 19 publications

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“…In apparent concordance with the before-mentioned unit, in the western sector of Calahoyo, is another unit composed predominantly of conglomerate deposits that were interpreted by Zurita et al (2017) as the basal member of the Tafna Formation (Turner, 1964). This section is considered late Miocene–Pliocene in age according to the paleontological evidence by those authors.…”

Section: Geographic and Geological Settingsupporting

confidence: 75%

“…Finally, in the Casira Basin are the most recent fossiliferous sedimentary sequences analyzed in this work. These correspond to the levels of the upper member of Tafna Formation (Zurita et al, 2017) and are identified as Unit B in this work (Fig. 2.3).…”

Section: Geographic and Geological Settingsupporting

confidence: 67%

“…According to the paleontological content, i.e., Macrochorobates scalabrinii (Moreno and Mercerat, 1891), the age of this section is late Miocene.

Figure 2.Stratigraphic provenance of the materials: ( 1 ) lower and ( 2 ) upper section of Unit A, and (3) upper section of Unit B (Tafna Formation, sensu Zurita et al, 2017). …”

Section: Geographic and Geological Settingmentioning

confidence: 99%

“…Stratigraphic provenance of the materials: ( 1 ) lower and ( 2 ) upper section of Unit A, and (3) upper section of Unit B (Tafna Formation, sensu Zurita et al, 2017). …”

Section: Geographic and Geological Settingmentioning

confidence: 99%

“…Recently, Zurita et al (2017) reported the first finds of fossil xenarthrans at a new locality (Calahoyo) at > 3600 masl at the eastern end of the Puna. These remains were exhumed from the Tafna Formation (Turner, 1964, but see discussion below) and suggest a late Miocene–Pliocene age for the sequence.…”

Section: Introductionmentioning

confidence: 99%

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New records of Neogene Xenarthra (Mammalia) from eastern Puna (Argentina): diversity and biochronology

et al. 2019

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Xenarthra is an endemic South American lineage of mammals, probably the sister clade of the other placental mammals. The oldest records of Xenarthra are from the latest Paleocene, although its current diversity is much lower than that recorded in some intervals of the Cenozoic Era. A new Neogene Xenarthra (Pilosa and Cingulata) assemblage from two localities of the Argentine Eastern Puna (Calahoyo and Casira) is described. The newly recorded taxa—Cingulata, Dasypodidae, Eutatini: Stenotatus sp. indet. and Eutatini indet., Euphractini: Macrochorobates scalabrinii (Moreno and Mercerat, 1891), and Tardigrada, Mylodontinae: cf. Simomylodon sp. indet. and Simomylodon cf. S. uccasamamensis Saint-André et al., 2010—and those already published from Calahoyo—Cingulata: Macrochorobates chapadmalensis (Ameghino, 1908), Eosclerocalyptus sp. indet., and Tardigrada, Megatheriidae: Pyramiodontherium bergi (Moreno and Mercerat, 1891)—suggest a middle–late Miocene age for the fossil-bearing levels. In Calahoyo, the presence of Stenotatus sp. indet., in addition to some rodents currently under study in the lower levels, suggest a closer similarity with the palaeofauna of Cerdas (southern Bolivia), probably involving the last part of the Miocene Climatic Optimum. The Xenarthra recorded in the middle and upper levels of Calahoyo and Casira suggest a late Miocene–Pliocene age. A comparative analysis between Calahoyo and Casira highlights the absence of Cingulata in the latter and a high diversity in the former. This situation probably indicates different paleoenvironmental conditions. Finally, we present the first certain record of the genus Simomylodon Saint-André et al., 2010 in Argentina, which includes the oldest record of dermal ossicles for sloths in South America.

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Section: Geographic and Geological Settingsupporting

confidence: 75%

Section: Geographic and Geological Settingsupporting

confidence: 67%

“…According to the paleontological content, i.e., Macrochorobates scalabrinii (Moreno and Mercerat, 1891), the age of this section is late Miocene.

Figure 2.Stratigraphic provenance of the materials: ( 1 ) lower and ( 2 ) upper section of Unit A, and (3) upper section of Unit B (Tafna Formation, sensu Zurita et al, 2017). …”

Section: Geographic and Geological Settingmentioning

confidence: 99%

“…Stratigraphic provenance of the materials: ( 1 ) lower and ( 2 ) upper section of Unit A, and (3) upper section of Unit B (Tafna Formation, sensu Zurita et al, 2017). …”

Section: Geographic and Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New records of Neogene Xenarthra (Mammalia) from eastern Puna (Argentina): diversity and biochronology

et al. 2019

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The Late Miocene mammals from the Humahuaca Basin (northwestern Argentina) provide new evidence on the initial stages of the Great American Biotic Interchange

Candela,

Abello,

Reguero

et al. 2023

Papers in Palaeontology

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We describe new Late Miocene mammalian specimens from the Maimará Formation (Late Miocene to Early Pliocene) exposed at Humahuaca Basin (23°–24°S), northwestern Argentina (NWA), and analyse their taxonomy and relevance for our understanding of the initial stages of the Great American Biotic Interchange (GABI). The stratigraphical and geochronological control of the studied specimens indicates a time window of c. 6.6–5.8 Ma. These data are crucial for establishing the oldest records of the Holarctic immigrants of the GABI. The first record of cricetid rodents from the Maimará Formation is reported. Moreover, with an age of c. 6 Ma it is the first appearance datum (FAD) of these rodents in South America. The age of the procyonid Cyonasua recorded in this unit is estimated between c. 6.6 and c. 6.4 Ma. The record of procyonids and cricetids in the same continuous sedimentary sequence suggests that the time interval between the dispersion of both groups into the continent during GABI was c. 1 myr. Of the autochthonous mammals from the Maimará Formation, the first records of litopterns, chlamyphorid and mylodontine xenarthrans, and caviomorph rodents (including new species Pithanotomys? solisae and Palaeocavia humahuaquense) are described. FADs of immigrant and autochthonous mammals in NWA suggest a major faunal turnover during GABI at the Messinian, probably linked to global climatic changes and the tectonic activity that affected the Humahuaca Basin at that time. Hypsodonty, a dominant feature among Maimaran mammals, may be related to a landscape strongly influenced by the Andean uplift.

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First record of Posnanskytherium (Notoungulata, Toxodontidae) in the late Neogene of eastern Puna, Argentina

Ferrero,

Schmidt,

Costamagna

et al. 2024

J Mammal Evol

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Xenarthra (Mammalia) from a new late Neogene fossiliferous locality in Northwestern Argentina

Cited by 10 publications

References 19 publications

New records of Neogene Xenarthra (Mammalia) from eastern Puna (Argentina): diversity and biochronology

New records of Neogene Xenarthra (Mammalia) from eastern Puna (Argentina): diversity and biochronology

The Late Miocene mammals from the Humahuaca Basin (northwestern Argentina) provide new evidence on the initial stages of the Great American Biotic Interchange

First record of Posnanskytherium (Notoungulata, Toxodontidae) in the late Neogene of eastern Puna, Argentina

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