Macrochorobates scalabrinii (Moreno &amp; Mercerat) (Cingulata, Dasypodidae) en el Mioceno tardío de la Provincia de San Juan (Argentina). Implicancias biocronoestratigráficas y paleobiogeográficas

Contreras, Víctor Hugo; Tomassini, Rodrigo Leandro; Pérez, Miguel Saavedra; Oliva, Cristian

doi:10.4072/rbp.2013.2.11

Cited by 14 publications

(23 citation statements)

References 8 publications

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“…Osteoderms of JUY-P-0090 and JUY-P-0033 (previously described by Zurita et al, 2017) differ from Macrochorobates chapalmalensis in: (1) larger size; (2) the central figure of mobile osteoderms have a less acute posterior angle; and (3) the more convex peripheral figures of the fixed osteoderms. As reported by Moreno and Mercerat (1891) and Contreras et al (2013), two other characteristics of Macrochorobates scalabrinii observed in this material are: (1) in some mobile osteoderms, very shallow, barely distinguishable furrows divide the lateral figures into two parts; and (2) piliferous foramina are present on the posterior and both lateral margins, are variable in number, and form a single row.…”

Section: Systematic Paleontologysupporting

confidence: 80%

“…Radiometric dating for this unit estimated the age to be between 7.14 and 5.59 Ma (Marshall and Patterson, 1981; Latorre et al, 1997; Reguero and Candela, 2011; Bonini et al, 2017). This species has also been cited for the Epecuén Formation (Huayquerian SALMA), Buenos Aires Province (Scillato-Yané, 1980, 1982); Cerro Azul Formation (Huayquerian SALMA), La Pampa Province (Esteban et al, 2001; Urrutia et al, 2008); Salicas Formation, La Rioja Province (Tauber, 2005; Brandoni et al, 2012); and Las Flores Formation, San Juan Province (Contreras, 2007; Contreras et al, 2013) in which the fossil-bearing level is between 6.9 and 6.3 Ma (Ré et al, 2003). According to Tonni et al (1998) and Cione and Tonni (2005), the occurrence of Macrochorobates scalabrinii in the sediments overlying the Arroyo Chasicó Formation, Buenos Aires Province, allowed assignment of these levels to the Macrochorobates scalabrinii Biozone as the biostratigraphic base for the early Huayquerian Age/Stage.…”

Section: Systematic Paleontologymentioning

confidence: 94%

“…The peripheral figures are limited by furrows with numerous foramina as in Macrochorobates , Chorobates , and Proeuphractus (Scillato-Yané, 1982; Carlini and Scillato-Yané, 1995; Urrutia et al, 2008). The marginal foramina are numerous on a single row on the posterior and both lateral margins, as in Macrochorobates (Contreras et al, 2013) and Proeuphractus (Scillato-Yané, 1982; Esteban et al, 2001; Urrutia et al, 2008), but differ from Chorobates in which the foramina are on the posterior and external lateral margins (Scillato-Yané, 1982; Carlini and Scillato-Yané, 1995) and from Paraeuphractus in which the foramina are numerous, form a double row, and are present on the posterior margin (Scillato-Yané, 1982). Semimobile osteoderms of the pelvic shield are similar in morphology to mobile osteoderms; numerous piliferous foramina in a single row are present on the posterior and both lateral margins.…”

Section: Systematic Paleontologymentioning

confidence: 97%

“…The lateral figures are less elevated than the central one, and are slightly flat as in Macrochorobates (Castellanos, 1947), Euphractus , and Paraeuphractus , unlike those of Chorobates and Proeuphractus in which the lateral figures are convex and higher than the central figure (Scillato-Yané, 1982). Some osteoderms display shallow furrows oblique to the longitudinal axis of the lateral figure, which divide it into two smaller figures, anterior and posterior, as in Macrochorobates (Moreno and Mercerat, 1891; Contreras et al, 2013), Chorobates (Carlini and Scillato-Yané, 1995), Proeuphractus Ameghino, 1886 (Esteban et al, 2003; Urrutia et al, 2008), and Macroeuphractus Ameghino, 1887 (Scillato-Yané, 1982; Urrutia et al, 2008). The marginal foramina form a single row on the posterior and both lateral margins, as in Proeuphractus (Scillato-Yané, 1982; Esteban et al, 2001; Tauber, 2005; Urrutia et al, 2008) and Macroeuphractus (Mones and Mehl, 1990).…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…Most knowledge of the evolutionary history of Xenarthra comes from southern South America (Carlini et al, 2005; Croft et al, 2016), but knowledge of the group from middle and low latitudes has recently increased (Cozzuol, 2006; Ciancio et al, 2013; Tejada-Lara et al, 2015; Amson et al, 2016; Antoine et al, 2016), including Andean and sub-Andean areas (Croft et al, 2004, 2007, 2009, 2016; Reguero and Candela, 2008, 2011; Contreras et al, 2013; Bonini et al, 2017). Particularly between 30°S and 15°S, several authors have reported numerous Neogene localities bearing abundant paleofaunas (some of them from elevations of > 2500 masl) in which xenarthrans are one of the best-represented groups.…”

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: Systematic Paleontologysupporting

confidence: 80%

Section: Systematic Paleontologymentioning

confidence: 94%

Section: Systematic Paleontologymentioning

confidence: 97%

Section: Systematic Paleontologymentioning

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 last horned armadillos: phylogeny and decline of Peltephilidae (Xenarthra, Cingulata)

Barasoain

Croft

Zurita

et al. 2023

Papers in Palaeontology

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Peltephilidae (Xenarthra, Cingulata) is an ancient lineage of medium–large‐sized ‘armadillos’ from South America, characterized by chisel‐shaped molariforms, a U‐shaped dental arcade, and cephalic osteoderms modified into hornlike structures. Although the biochron of the group extends from the early Eocene to the Late Miocene, the most abundant and complete records come from the Early Miocene of Patagonia. Remains from the Late Miocene are very scarce, and the last records of the group are from the Chasicoan Stage (Tortonian). The only taxon known from this interval is Epipeltephilus kanti from the Arroyo Chasicó Formation (9.23 ± 0.09 Ma; Buenos Aires Province, Argentina), a species previously represented only by a few isolated osteoderms. Here we report new remains assigned to E. kanti from the Late Miocene of Loma de Las Tapias Formation (c. 9.0–7.8 Ma; San Juan Province, Argentina), including a hemimandible and several fixed and mobile osteoderms. These new specimens constitute the youngest record of Peltephilidae. The inclusion of E. kanti within Epipeltephilus and the monophyly of the genera Peltephilus and Epipeltephilus are corroborated for the first time through a cladistic analysis. The decline and eventual disappearance of this ‘armadillo’ group in the Late Miocene is chronologically coincident with the replacement of subtropical/tropical environments by more open and arid ones and with the proliferation of other large armadillos such as Vetelia, Macrochorobates, and Macroeuphractus.

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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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Macrochorobates scalabrinii (Moreno & Mercerat) (Cingulata, Dasypodidae) en el Mioceno tardío de la Provincia de San Juan (Argentina). Implicancias biocronoestratigráficas y paleobiogeográficas

Cited by 14 publications

References 8 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 last horned armadillos: phylogeny and decline of Peltephilidae (Xenarthra, Cingulata)

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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