Genomic Data from Extinct North American Camelops Revise Camel Evolutionary History

Area of Science:

• Paleogenomics
• Evolutionary Biology
• Mammalian Paleontology

Background:

• Paleogenomic technologies are advancing our understanding of extinct mammals.
• Many Quaternary species lack molecular data due to fossil rarity and poor DNA preservation.
• Camelops cf. hesternus, an extinct North American western camel, has remained enigmatic.

Purpose of the Study:

• To reconstruct the evolutionary relationships of Camelops cf. hesternus using paleogenomic data.
• To resolve phylogenetic discrepancies between molecular and morphology-based studies of Camelops.

Main Methods:

• Extraction and analysis of paleogenomic data from Camelops cf. hesternus fossil bones.
• Reconstruction of high-coverage mitochondrial genomes and low-coverage nuclear genomes.
• Phylogenetic analysis comparing Camelops with extant camelid species.

Main Results:

• Complete mitochondrial and partial nuclear genomes were reconstructed from fragmented DNA (modal length ~35 bp).
• Camelops was found to be sister to African and Asian camels (bactrian and dromedary).
• Camelops is distinct from South American camelids (llamas, guanacos, alpacas, vicuñas).

Conclusions:

• Paleogenomic data place Camelops as an Old World camel lineage, diverging in the Late Miocene.
• This contradicts previous morphology-based hypotheses suggesting a link to South American camelids.
• Modern paleogenomics can successfully resolve evolutionary histories of extinct taxa even with degraded DNA.