A new pachyrukhine (Notoungulata: Typotheria) from the late Early Miocene of south-central Chile

Solórzano, Andrés; Encinas, Alfonso; Kramarz, Alejandro Gustavo; Carrasco, Gabriel; Núñez–Flores, Mónica; Bobe, René

doi:10.1080/08912963.2023.2214568

Cited by 2 publications

(13 citation statements)

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“…Within the Suborder Typotheria , the family Hegetotheriidae (late Oligocene–Early Pleistocene) includes placental mammals of small to medium size, with hypertrophied, hypselodont, and procumbent first incisors, hypselodont cheek teeth, lower molariforms with a deep labial groove, P2–M3 imbricated, and loss of ectoloph plications on upper molars (Cerdeño & Reguero, 2015; Kramarz & Paz, 2013; Seoane & Cerdeño, 2019). Hegetotheriidae currently comprises 11 genera distributed in two subfamilies: Hegetotheriinae , recognized as paraphyletic in most recent phylogenetic analyses (except for Billet, 2011; Seoane et al, 2017, and this work), and Pachyrukhinae , a well-established monophyletic group (Billet, 2011; Cerdeño & Reguero, 2015; Croft & Anaya, 2006; Kramarz & Bond, 2017; Reguero & Prevosti, 2010; Seoane & Cerdeño, 2019; Solórzano et al, 2023; Vera, 2019).…”

Section: Introductionmentioning

confidence: 85%

“…Croft and Anaya (2006) defined this character (Fig. S10, Supplementary Data 3) and scored Prosotherium garzoni with state 1, but Cerdeño and Reguero (2015) reinterpreted its condition as unknown, which was maintained in later phylogenies (Kramarz & Bond, 2017;Seoane et al, 2017;Solórzano et al, 2023;Vera, 2019). Among the few cranial remains of this species, MACN-A 12458 (52-455), ACM 3730, and ACM 3731 have this region preserved, but the extension of the foramina or the premaxillary-maxillary suture are not clear (Fig.…”

Section: Character Scoringsmentioning

confidence: 99%

“…S3C-E, Supplementary Data 3; Kramarz & Bond, 2017). Solórzano et al (2023) stated, "on the right side, where the canine is complete, the labial and lingual walls are slightly more labial than P1." They did not figure this feature, but our examination of "H." novum MACN-PV 11749 (Fig.…”

Section: Character Scoringsmentioning

confidence: 99%

“…Despite this change, the original definition or the first modified version were used in most phylogenies of the family Hegetotheriidae (Cerdeño & Reguero, 2015;Kramarz & Bond, 2017;Seoane et al, 2017;Vera, 2019). Recently, Solórzano et al (2023) followed Billet et al and Billet (2011). Here, we follow the modification made by Solórzano et al (2023) as it describes better the anatomical condition observed in this family (Fig.…”

Section: Character Scoringsmentioning

confidence: 99%

“…During most of the Cenozoic, South America had an endemic fauna, within which the most abundant and diverse animals were the South American native ungulates (Seoane et al, 2019). Among them, the order Notoungulata has a large fossil record extending from the Paleocene to the Early Holocene (Kramarz & Bond, 2017; Solórzano et al, 2023). Within the Suborder Typotheria , the family Hegetotheriidae (late Oligocene–Early Pleistocene) includes placental mammals of small to medium size, with hypertrophied, hypselodont, and procumbent first incisors, hypselodont cheek teeth, lower molariforms with a deep labial groove, P2–M3 imbricated, and loss of ectoloph plications on upper molars (Cerdeño & Reguero, 2015; Kramarz & Paz, 2013; Seoane & Cerdeño, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Reassessment of Tegehotherium burmeisteri Ameghino 1903–1904 ( Notoungulata , Hegetotheriidae ) and a new phylogenetic analysis of Hegetotheriidae

Seoane,

Cerdeño,

Gaetano

2023

Journal of Vertebrate Paleontology

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Within the notoungulate family Hegetotheriidae, some species have not been analyzed since their original publication more than a century ago. Here we present the first re-evaluation of Tegehotherium burmeisteri, including a detailed description of its holotype in an updated comparative framework, a species presumably coming from the Trelew Member of the Sarmiento Formation (Chubut Province, Argentina). Tegehotherium burmeisteri is included for the first time in a phylogenetic analysis centered in the interrelationships of hegetotheriids and defining clades according to the PhyloCode. Tegehotherium burmeisteri is recovered as a hegetotheriine closely related to Sallatherium and Hegetotherium; Hegetotheriopsis sulcatus is the earliest branch of the clade Hegetotheriidae, whereas Prohegetotherium and Paedotherium turn out to be paraphyletic, reinforcing results obtained in recent studies. The family Hegetotheriidae and both subfamilies, Hegetotheriinae and Pachyrukhinae, are recovered as monophyletic groups and defined phylogenetically, as well as two new clades: Pachyrukhini and Hemihegetotheriomorpha.

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Section: Introductionmentioning

confidence: 85%

Section: Character Scoringsmentioning

confidence: 99%

Section: Character Scoringsmentioning

confidence: 99%

Section: Character Scoringsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reassessment of Tegehotherium burmeisteri Ameghino 1903–1904 ( Notoungulata , Hegetotheriidae ) and a new phylogenetic analysis of Hegetotheriidae

Seoane,

Cerdeño,

Gaetano

2023

Journal of Vertebrate Paleontology

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Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S

Encinas,

Rosselot,

Sagripanti

et al. 2024

American Journal of Science

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The south-central Chile and Argentina margin experienced a regional phase of extensional tectonics during the Oligocene–early Miocene, forming several basins across the forearc, Andean Cordillera, and retroarc regions. These basins accumulated thick successions of volcanic and sedimentary rocks. Subsequently, Neogene contractional tectonics led to the development of the current Andean Cordillera and the deposition of synorogenic clastic deposits in foreland basins. Traditionally, the Cura Mallín Formation, comprising a lower volcanic unit (CMV) and an upper sedimentary unit (CMS), has been interpreted to have formed during the Oligocene–early Miocene extensional phase. However, some studies propose deposition of the CMS in a foreland basin during the early–late Miocene. To unravel the transition from extensional to contractional tectonics in the Andes of south-central Chile and Argentina, we conducted new geochronological analyses (U-Pb, LA-ICP-MS) and integrated these results with structural, stratigraphic, and sedimentological observations in key sections within the CMS and the overlying Trapa-Trapa Formation in the Principal Cordillera along the Chile-Argentina border (37°–38°S). Our findings indicate that only the lower part of the CMS was deposited in an extensional setting, as evidenced by the presence of an inverted extensional wedge dated at ∼20 Ma. The middle-upper CMS (∼19 to 9 Ma) and contemporaneous units to the east exhibit evidence of syncontractional deformation, suggesting deposition in a foreland basin generated by shortening of the western Principal Cordillera. Around 9 Ma, uplift of the Agrio and Chos Malal fold and thrust belts, east of the Principal Cordillera, led to segmentation of the foreland basin. The Trapa Trapa Formation was deposited in a hinterland basin, with sediment sourced from the east. After ∼6.5 Ma, major contractional deformation shifted westward, resulting in intense folding of the CMS and Trapa Trapa Formation and subsequent thrusting of the western Principal Cordillera over the Central Depression. Our study suggests that deformation progressed toward the eastern foreland during the early to late Miocene and then shifted toward the western forearc during the late Miocene to Pleistocene.

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A new pachyrukhine (Notoungulata: Typotheria) from the late Early Miocene of south-central Chile

Cited by 2 publications

References 54 publications

Reassessment of Tegehotherium burmeisteri Ameghino 1903–1904 ( Notoungulata , Hegetotheriidae ) and a new phylogenetic analysis of Hegetotheriidae

Reassessment of Tegehotherium burmeisteri Ameghino 1903–1904 ( Notoungulata , Hegetotheriidae ) and a new phylogenetic analysis of Hegetotheriidae

Cenozoic Basin Evolution During Alternating Extension and Shortening in the Southern Central Andes Along the Chile-Argentina Border, 37–38°S

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