Description of a new species of Sparassocynus (Marsupialia: Didelphoidea: Sparassocynidae) from the late Miocene of Jujuy (Argentina) and taxonomic review of Sparassocynus heterotopicus from the Pliocene of Bolivia

Abello, M. Alejandra; Reyes, Martín de los; Candela, Adriana Magdalena; Pujos, François; Voglino, Damián; Quispe, Bernardino Mamaní

doi:10.11646/zootaxa.3937.1.7

Cited by 16 publications

(20 citation statements)

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“…The Argentine Province of Jujuy has one of the most important continental late Miocene–Pleistocene sequences of South America, in areas currently near 2700 masl (Pingel et al, 2012). More precisely in the Quebrada de Humahuaca (Eastern Cordillera), the localities of Uquía, Esquina Blanca, Chucalezna, San Roque, and Maimará (Salfity et al, 1984; Reguero et al, 2007; Reguero and Candela, 2008, 2011; Pingel et al, 2012; Pujos et al, 2012; Abello et al, 2015; Galli et al, 2016; Bonini et al, 2017) have yielded a large diversity of vertebrates in which xenarthrans are well represented (Reguero and Candela, 2008, 2011; Pujos et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Note that the most fossiliferous levels at Quebrada de Maimará, where we recently collected the first vertebrates with precise stratigraphic provenance for this formation (Pujos et al, 2012;Candela et al, 2013;Abello et al, 2015), are located between the most basal tuffs of the section that outcrops west of Maimará town.…”

Section: Class Mammalia Linnaeus 1758mentioning

confidence: 95%

“…(2) Stratigraphic section at Quebrada de Maimará (modified from Abello et al, 2015) showing the most basal tuffs of the section, modified from Pujos et al (2012). late Miocene), Entre Ríos Province, northeast Argentina (Brunetto et al, 2013).…”

Section: Class Mammalia Linnaeus 1758mentioning

confidence: 99%

“…The deposits show an upwardly coarsening sequence developed in an ephemeral fluvial system under arid and semi-arid conditions (Galli et al, 2012). The original locality data provided with specimen JUY-P 49 indicates that it was surface collected by Dr. R. Loss on 5 January 1950, ~50 m to the West of the Nacional Route 9 close to the southern valley of Quebrada Maimará, stratigraphically located a few meters above the horizon represented by reddish-brown finer-grained clays and siltstones where other fossils were found (Berman, 1989; Pujos et al, 2012; Abello et al, 2015). This horizon is located between two basal massive tuffs correlated with 10HUM02 and 10HUM21 of Pingel et al (2013, fig.…”

Section: Geologic Settingmentioning

confidence: 99%

“…( 1 ) Simplified Cenozoic chronostratigraphy of the Humahuaca Basin area (modified from Abello et al, 2015), showing Maimará and Tilcara formations and 206 Pb/ 238 U zircon ages obtained from several volcanic ashes in Humahuaca Basin volcanic rocks (Pingel et al, 2013). ( 2 ) Stratigraphic section at Quebrada de Maimará (modified from Abello et al, 2015) showing the most basal tuffs of the section, modified from Pujos et al (2012). …”

Section: Geologic Settingmentioning

confidence: 99%

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First record of Toxodontidae (Mammalia, Notoungulata) from the late Miocene–early Pliocene of the southern central Andes, NW Argentina

Bonini¹,

Schmidt²,

Reguero³

et al. 2017

J. Paleontol.

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Abstract.-A new species of toxodontid notoungulate, Xotodon maimarensis n. sp., is described from the Maimará Formation (late Miocene-early Pliocene), Jujuy Province, northwestern Argentina. This is the first record of a toxodontid from the Eastern Cordillera. The specimen is housed at the Museo de Geología, Mineralogía y Paleontología, Instituto de Geología y Minería de la Universidad Nacional de Jujuy. It consists of an incomplete mandible preserving the right mandibular ramus with part of the dental series, partially preserved symphysis with all the incisors, and a small portion of the left ramus without teeth. The following characters distinguish it as a new taxon: symphysis long and narrow with slight divergence of its lateral borders; strong procumbence of lower incisors and deeply implanted i3; chin angle lower than in X. major and X. cristatus and bulging labial keel limiting strong lateral concavities. Comparative analysis in the context of the recently revised Neogene Toxodontidae indicates that the Maimará specimen shares mandibular features and dental characters with Xotodon and Mixotoxodon, differing from the latter by the more upraised symphysis. The phylogenetic position of Xotodon maimarensis n. sp. supports the taxonomic interpretation of the studied specimen as a new species of Xotodon. This new Toxodontidae increases the knowledge of the diversity and radiation of this group of notoungulates in northwest Argentina.

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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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Description of a new species of Sparassocynus (Marsupialia: Didelphoidea: Sparassocynidae) from the late Miocene of Jujuy (Argentina) and taxonomic review of Sparassocynus heterotopicus from the Pliocene of Bolivia

Cited by 16 publications

References 16 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

First record of Toxodontidae (Mammalia, Notoungulata) from the late Miocene–early Pliocene of the southern central Andes, NW Argentina

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

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