10.5061/DRYAD.6S268N1
Churchill, Morgan
New York Institute of Technology
Geisler, Jonathan H.
University of Wisconsin–Oshkosh
Beatty, Brian L.
University of Wisconsin–Oshkosh
Goswami, Anjali
Natural History Museum
Data from: Evolution of cranial telescoping in echolocating whales
(Cetacea: Odontoceti)
Dryad
dataset
2018
odontocete
Oligocene
Odontoceti
disparity
Cranial Telescoping
whale evolution
National Science Foundation
https://ror.org/021nxhr62
NSF-DEB 1349697
2018-04-17T17:14:58Z
2018-04-17T17:14:58Z
en
https://doi.org/10.1111/evo.13480
1921105 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Odontocete (echolocating whale) skulls exhibit extreme posterior
displacement and overlapping of facial bones, here referred to as
retrograde cranial telescoping. To examine retrograde cranial telescoping
across 40 million years of whale evolution, we collected 3D scans of whale
skulls spanning odontocete evolution. We used a sliding semilandmark
morphometric approach with Procrustes superimposition and PCA to capture
and describe the morphological variation present in the facial region,
followed by Ancestral Character State Reconstruction (ACSR) and
evolutionary model fitting on significant components to determine how
retrograde cranial telescoping evolved. The first PC score explains the
majority of variation associated with telescoping and reflects the
posterior migration of the external nares and premaxilla alongside
expansion of the maxilla and frontal. The earliest diverging fossil
odontocetes were found to exhibit a lesser degree of cranial telescoping
than later diverging but contemporary whale taxa. Major shifts in PC
scores and centroid size are identified at the base of Odontoceti, and
early burst and punctuated equilibrium models best fit the evolution of
retrograde telescoping. This indicates that the Oligocene was a period of
unusually high diversity and evolution in whale skull morphology, with
little subsequent evolution in telescoping.
Appendix B R Code for sliding landmarks and GPAR code use in morphometric
analysisAppendix D Telescoping_supermatrixNexus file of matrix of
characters for phylogenetic analysisAppendix E Age DataAge data of
specimens/taxa in studyAppendix A list of specimenslist of specimens
United States