Skip to Main content Skip to Navigation
Journal articles

Mitochondrial genomes reveal the extinct Hippidion as an outgroup to all living equids

Abstract : Hippidions were equids with very distinctive anatomical features. They lived in South America 2.5 million years ago (Ma) until their extinction approxima- tely 10 000 years ago. The evolutionary origin of the three known Hippidion morphospecies is still disputed. Based on palaeontological data, Hippidion could have diverged from the lineage leading to modern equids before 10 Ma. In contrast, a much later divergence date, with Hippidion nesting within modern equids, was indicated by partial ancient mitochondrial DNA sequences. Here, we characterized eight Hippidion complete mitochondrial genomes at 3.4–386.3-fold coverage using target-enrichment capture and next-generation sequencing. Our dataset reveals that the two morphospecies sequenced (H. saldiasi and H. principale) formed a monophyletic clade, basal to extant and extinct Equus lineages. This contrasts with previous genetic analyses and supports Hippidion as a distinct genus, in agreement with palaeontological models. We date the Hippi- dion split from Equus at 5.6–6.5 Ma, suggesting an early divergence in North America prior to the colonization of South America, after the formation of the Panamanian Isthmus 3.5 Ma and the Great American Biotic Interchange.
Document type :
Journal articles
Complete list of metadata
Contributor : Nathalie Lyvet Connect in order to contact the contributor
Submitted on : Monday, May 30, 2016 - 10:59:31 AM
Last modification on : Friday, August 5, 2022 - 12:31:22 PM

Links full text



Clio Der Sarkissian, Julia Vilstrup, Mikkel Schubert, Andaine Seguin-Orlando, David Eme, et al.. Mitochondrial genomes reveal the extinct Hippidion as an outgroup to all living equids. Biology Letters, Royal Society, The, 2015, 11 (20141058), pp.1-5. ⟨10.1098/rsbl.2014.1058⟩. ⟨hal-01323150⟩



Record views