Journal
BIOLOGY LETTERS
Volume 12, Issue 4, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsbl.2015.1047
Keywords
Titanosauria; palaeobiogeography; phylogenetics; Gondwana
Categories
Funding
- Jurassic Foundation
- Paleontological Society
- Ohio University
- National Science Foundation [EAR_1349825]
- Division Of Earth Sciences
- Directorate For Geosciences [1349825] Funding Source: National Science Foundation
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Recent model-based phylogenetic approaches have expanded upon the incorporation of extinct lineages and their respective temporal information for calibrating divergence date estimates. Here, model-based methods are explored to estimate divergence dates and ancestral ranges for titanosaurian sauropod dinosaurs, an extinct and globally distributed terrestrial Glade that existed during the extensive Cretaceous supercontinental break-up. Our models estimate an Early Cretaceous (approx. 135 Ma) South American origin for Titanosauria. The estimated divergence dates are broadly congruent with Cretaceous geophysical models of supercontinental separation and subsequent continental isolation while obviating the invocation of continuous Late Cretaceous continental connections (e.g. ephemeral land bridges). Divergence dates for mid-Cretaceous African and South American sister lineages support semi-isolated subequatorial African faunas in concordance with the gradual northward separation between South America and Africa. Finally, Late Cretaceous Africa may have linked Laurasian lineages with their sister South American lineages, though the current Late Cretaceous African terrestrial fossil record remains meagre.
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