Occurrence of Cyclusphaera scabrata in Achiri (late middle-early late Miocene?, Bolivian Altiplano): Paleogeographical implication

Prámparo, Mercedes B.; Antoine, Pierre‐Olivier; Marivaux, Laurent; Flores, Rubén Andrade; Fernández‐Monescillo, Marcos; Boscaini, Alberto; Quispe, Bernardino Mamaní; Fauquette, Séverine; Bonnet, Colline; Münch, Philippe; Pujos, François

doi:10.1016/j.jsames.2022.103990

Cited by 2 publications

(22 citation statements)

References 37 publications

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“…2017; Boschman 2021; Prámparo et al . 2022). Curiously, the region of Achiri where the fossils were found is currently both at a similar height (3960 m ASL) and c .…”

Section: Discussionmentioning

confidence: 99%

“…2020; Prámparo et al . 2022). Given that T. achachila appears as distantly related to these species, lacking some features recovered as synapomorphic of the T. marmoratus species group (and adjacent nodes) such as the greater anterior extent of frontoparietals (B17: c4, 1 → 0) and otic ramus of squamosal (B17: c31, 0 → 1) (Barrionuevo 2017b; this study), it is likely that convergences between them are related to environmental adaptation to an aquatic life.…”

Section: Discussionmentioning

confidence: 99%

“…These fine‐grained and plant‐rich green marls are indicative of lacustrine and low‐energy fluvial settings in the area, which is confirmed by the palynological assemblage recovered at the loci ACH‐25 and ACH‐26 (Prámparo et al . 2022). The Telmatobius ‐yielding locus ACH‐14 is a white, tuffaceous, fine‐grained laminated siltite of low‐energy fluviolacustrine origin, intercalated between green marl‐dominated beds, which crops out 4 km south of Achiri near the base of Cerro Pisakeri (Prámparo et al .…”

Section: Geological Settingmentioning

confidence: 99%

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A new early water frog (Telmatobius) from the Miocene of the Bolivian Altiplano

Gómez,

Ventura,

Turazzini

et al. 2024

Papers in Palaeontology

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We describe the new frog Telmatobius achachila sp. nov. from the late Middle to earliest Late Miocene of Achiri, based on a partial skeleton found at 3960 m above sealevel in the Bolivian Altiplano. This skeleton, attributed to a male adult, constitutes the first documented fossil record of the speciose living genus Telmatobius, endemic to the Andean Cordillera and the Altiplano. Phylogenetic analysis confirms the new species as being part of the crown group, and diverging both later than the T. verrucosus group and earlier than the T. bolivianus, T. marmoratus and T. macrostomus groups. Coupled with its accurate stratigraphic provenance and age, this phylogenetic position provides a relevant calibration point for timing the evolutionary history of these highland, mostly aquatic frogs. The skeleton of T. achachila indicates that several of the osteological peculiarities of extant Telmatobius were already acquired at c. 12 Ma, including some that might be linked to their aquatic lifestyle. Together with mixed montane–rainforest pollen vegetation uncovered in the same level, this fossil specimen further provides key data enabling a more accurate reconstruction of ancestral habitats and elevation ranges of Telmatobius, agreeing with the previously postulated conditions in which these water frogs might have first evolved. Ultimately, this discovery adds to the sparse evidence of a humid tropical Bolivian Altiplano just prior to: (1) the Late Miocene uplift pulse of the Central Altiplano; and (2) the drastic climate deterioration that occurred from Late Miocene time onward, leading to the harsh highland‐steppe environments reigning there today.

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“…2017; Boschman 2021; Prámparo et al . 2022). Curiously, the region of Achiri where the fossils were found is currently both at a similar height (3960 m ASL) and c .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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A new early water frog (Telmatobius) from the Miocene of the Bolivian Altiplano

Gómez,

Ventura,

Turazzini

et al. 2024

Papers in Palaeontology

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“…It is important to mention that despite these growth patterns represent an endogenous aspect of the biology of mammals, other external factors such as environmental fluctuations and/or availability of food resources may also reinforce and/or be synchronized with growth. In this sense, increments of the rainfall patterns between 11-10 Ma have been recently interpreted from the stratigraphic record of Caragua and nearby localities [48,53,[87][88][89][90]. This information suggests the onset of wetter conditions and ecosystem reorganization at the local and regional scales.…”

Section: Plos Onementioning

confidence: 99%

“…Causality between both factors has been invoked through observed changes along the stratigraphic sections, including base level re-accommodation, modifications in the sedimentary regimes and watershed architecture, increment in basement-derived components, and associated landscape incision, beginning around 12 Ma [48,53,91]. Rapid climatic changes can lead to marked seasonality [90] imposing long lasting stressors over species and/or faunal interactions, with possible ecological and physiologic effects on individuals that can be observed in their skeletal structures, such as malnutrition or fibrous osteodystrophy [92,93]. Similar factors also may impact populations, including the disruption of trophic dynamics, negative density-dependent effects, or selective local extirpation/extinctions [94].…”

Section: Plos Onementioning

confidence: 99%

Paleohistology of Caraguatypotherium munozi (Mammalia, Notoungulata, Mesotheriidae) from the early late Miocene of northern Chile: A preliminary ontogenetic approach

Campos-Medina

Montoya‐Sanhueza²,

Moreno³

et al. 2023

PLoS ONE

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The Miocene Caragua fossil fauna in northern Chile contains a considerable number (7) of articulated partial skeletons tentatively assigned to Caraguatypotherium munozi (Notoungulata, Mesotheriidae), which presents up to 40% body size difference. Since either inter- and intra- specific wide size range has been observed in the Mesotheriidae family in general, we wanted explore the ontogenic stage signature of the sample, by carrying out the first comprehensive paleohistological description of the appendicular system in Notoungulata. Results show that: 1) they can be classified as subadults and adults, based on the presence of bone tissues typical of ceased somatic growth; 2) there is a notorious inter-skeletal variation on bone growth rates (skeletal modularity), particularly, the humerus showed a slower diameter growth and less remodelling than the femur, resulting as a better element for ontogenetic analyses; 3) marked cyclical growth is observed, characterised by fast early ontogenic continuous growth, and subsequent fast/slow stratified bone tissue layering. In general, such growth pattern suggests that C. munozi had a similar ontogenetic growth process as other modern mammals, that it should also be influenced by other sex-related, ecological and environmental factors. Likely related to the presence of rapid climatic variations, due to orogenic uplift and concomitant re-organization of the drainage processes along the western tectonic front of the Central Andes at that time.

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Occurrence of Cyclusphaera scabrata in Achiri (late middle-early late Miocene?, Bolivian Altiplano): Paleogeographical implication

Cited by 2 publications

References 37 publications

A new early water frog (Telmatobius) from the Miocene of the Bolivian Altiplano

A new early water frog (Telmatobius) from the Miocene of the Bolivian Altiplano

Paleohistology of Caraguatypotherium munozi (Mammalia, Notoungulata, Mesotheriidae) from the early late Miocene of northern Chile: A preliminary ontogenetic approach

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