A singular Hegetotheriinae (Notoungulata, Typotheria) from the late Oligocene-Early Miocene of the Subandean Region of Bolivia
Abstract Geological studies in the northern sector of the Chaco foreland Basin, Bolivia, yielded new fossils coming from late Oligocene-late Miocene of the Petaca Formation. Few fossil mammals were known from the Subandean Region of Bolivia. We report a partially complete mandible of a hegetotheriid Hegetotheriinae (Notoungulata, Typotheria) from Abapó (Río Grande River). The specimen (YPFB-LIT-PAL-005) is very close in size and dental morphology to the late Oligocene (Deseadan South American Land Mammal Age, SALMA) — Santacrucian (early Miocene) Prohegetotherium schiaffinoi (Kraglievich 1932) from Fray Bentos (Uruguay and Argentina), Salla (Bolivia), Divisadero Largo-Potrerillos and Quebrada Fiera (Argentina). However, mandibular characteristics, as the shape with a marked change in height along its length, increasing towards the back, a prominent masseteric crest, a deep mandibular groove, and a remarkable thickening of the ventral rim of the mandible, indicate differences between this specimen and Prohegetotherium schiaffinoi and the other Hegetotheriinae. The affinity of YPFB-LIT-PAL-005 with P. schiaffinoi suggests a late Oligocene to early Miocene for the upper bearing horizon of the Petaca Formation (in Abapó), an older age than previously assigned to the top of this unit (late Miocene), and confirms the taxon distribution between ∼ 36 ° to ∼ 17 ° south latitude.
Main Authors: | Reguero,Marcelo Alfredo, Tineo,David Eric, Bona,Paula, Pérez,Leandro Martín, Vergani,Gustavo Dardo, Ruiz,Gloria González, Poiré,Daniel Gustavo |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Sociedade Brasileira de Geologia
2021
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000200307 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Diversity and biostratigraphy of the late Oligocene-late Miocene sand dollars (Echinoidea: Scutelliformes) of Argentina and Uruguay
by: Del-Río,Claudia-J., et al.
Published: (2021) -
Swietenia (Meliaceae) flower in late oligocene-early miocene amber from Simojovel de Allende, Chiapas, Mexico
by: Castañeda Posadas, Carlos autor/a, et al. -
A Miocene toxodontid (Mammalia: Notoungulata) from the sedimentary series of the Cura-Mallín Formation, Lonquimay, Chile
by: Croft,Darin A., et al.
Published: (2003) -
Variations in elemental and mineralogical compositions of Late Oligocene, Early and Middle Miocene coal seams in the Kale-Tavas Molasse sub-basin, SW Turkey
by: Karayigit, Ali Ihsan, et al.
Published: (2020) -
Evidence of large Anacardiaceae trees from the Oligocene-early Miocene Santiago Formation, Azuero, Panama
by: Rodríguez-Reyes,Oris, et al.
Published: (2020)