Earliest Arikareean (later early Oligocene) Iniyoo local Fauna from Chilapa Formation of Santiago Yolomécatl area in northwestern Oaxaca, southern Mexico

Jiménez-Hidalgo, Eduardo; Lander, E. Bruce; Israde-Alcántara, Isabel; Rodríguez-Caballero, Nadia Wendoline; Guerrero-Arenas, Rosalía

doi:10.1016/j.jsames.2021.103307

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…Stylemys or aff. 'Stylemys' has been previously reported from the late Oligocene (Arikareean 1) of southern Mexico (Jiménez-Hidalgo et al, 2015;Jiménez-Hidalgo et al, 2021;Carbon-Chanona et al, 2022). The oldest occurrence of a rhinoclemmydine in southernmost North America is Rhinoclemmys (sensu lato) (UF 532008) from the Lirio Norte LF.…”

Section: Discussion and Conclusion Turtles From The Las Cascadas Form...mentioning

confidence: 85%

“…Stylemys or aff. 'Stylemys' gisellae has been previously reported from the late early Oligocene (Arikareean 1) Iniyoo local fauna (LF) of southern Mexico (Jiménez-Hidalgo et al, 2015;Jiménez-Hidalgo et al, 2021;Carbot-Chanona et al, 2022). A second testudinid taxon is known from only a single badly preserved partial shell (UF 275495) with a plastral forelobe unlike any other testudinid examined (Fig.…”

Section: Discussion and Conclusion Turtles From The Las Cascadas Form...mentioning

confidence: 95%

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A Ptychogastrine (Testudines, Geoemydidae) From the Early Miocene of Panama and a Review of Miocene Testudinoids From Central America

Bourque¹

2022

FLMNH

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Forachelys woodi gen. et sp. nov. is described from lower Miocene (Arikareean NALMA) exposures of the upper Las Cascadas Formation (~21 Ma) in the Panama Canal Basin. It represents the latest occurrence of ptychogastrine geoemydids in North America, a group known primarily from the early Eocene to late Miocene of Europe. Forachelys woodi shares features with taxa such as Geiselemys ptychogastroides (middle Eocene, Germany) and some species of the Ptychogaster/Temnoclemmys group (late Eocene to late Miocene, Europe). The epiplastral morphology is furthermore comparable to Bridgeremys pusilla (middle Eocene of Wyoming and Utah), a taxon previously interpreted as a rhinoclemmydine ancestor. Within the Las Cascadas Formation, F. woodi co-occurred with an undescribed species of rhinoclemmydine geoemydid that represents the oldest record of Rhinoclemmys (sensu lato). The Miocene fossil record of testudinoids in Central America is reviewed and reexamined. Testudinids are diverse in the Miocene of Panama and Honduras, represented by aff. Stylemys, Caudochelys (2–3 large to giant species), and an undescribed genus and species that resembles ‘Testudo’ costarricensis. Rhinoclemmydines persisted in Panama almost continuously from the early to late Miocene, with records from the Las Cascadas (~21 Ma), upper Culebra (~20–19 Ma), Cucaracha (~19 Ma), and lower Gatun (~12–11 Ma) formations. At least two concurrent rhinoclemmydines are present in the Cucaracha Formation of Panama, and two possibly concurrent taxa in the Gracias Formation (9–6.6 Ma) of Honduras.

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Section: Discussion and Conclusion Turtles From The Las Cascadas Form...mentioning

confidence: 85%

Section: Discussion and Conclusion Turtles From The Las Cascadas Form...mentioning

confidence: 95%

A Ptychogastrine (Testudines, Geoemydidae) From the Early Miocene of Panama and a Review of Miocene Testudinoids From Central America

Bourque¹

2022

FLMNH

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“…Specimens were collected from a fluviolacustrine sequence conformed by silty–clayey sediments with occasional lithics, which represents the marginal facies of the early Oligocene Chilapa Formation (Jiménez-Hidalgo et al . 2021). Two uranium–lead dating maximum depositional ages of 30.6 ± 0.77 and 30.62 ± 0.67 Ma, for detrital zircon grains from sandstone beds occurring above the bottom and top of the vertebrate fossil-bearing interval, indicate an early Oligocene age for the formation (Guerrero-Arenas et al .…”

Section: Study Areasmentioning

confidence: 99%

First Mexican records of Anthracotheriidae (Mammalia: Artiodactyla)

Jiménez-Hidalgo

Carbot-Chanona

2023

Earth and Environmental Science Transactions of the Royal Society of Edinburgh

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Anthracotheres are generalised artiodactyls that have an extensive record in the Cenozoic of Eurasia and Africa. In North America they have been collected in middle Eocene to early Miocene localities from the California Coast, the Great Plains and the Gulf Coast of the United States, with a single record from the early Miocene of Panama. Here we report few specimens from the early Oligocene (Ar1) Iniyoo Local Fauna of north-western Oaxaca, and the earliest Miocene of Simojovel de Allende, in northern Chiapas. This material has diverse features that indicate they belonged to the bothriodontine Arretotherium, such as selenodont cristids associated with the protoconid and hypoconid, the absence of a premetacristid, and the crenulated enamel. They share with Arretotherium acridens and Arretotherium meridionale the absence of a mesiolingual metacristid, but their general morphology and size indicate a close relationship to Ar. meridionale. Nevertheless, in absence of better-preserved specimens, we decided not to assign the fossil material to this species. Specimens from Oaxaca and Chiapas are the first records of anthracotheres in Mexico. These new records link the previous ones from temperate North America and tropical Central America and indicate that Anthracotheriidae had a very wide geographical distribution in North America during the Palaeogene and the Neogene. Additionally, they represent the southern-most records of Arretotherium in North America during the Oligocene and the early Miocene.

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