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Wildebeest-like bovid Rusingoryx (Pleistocene, Africa) evolved lambeosaurine-type nasal dome



Ben Creisler
bcreisler@gmail.com

A new paper that may be of interest:


Haley D. O’Brien, J. Tyler Faith, Kirsten E. Jenkins, Daniel J. Peppe,
Thomas W. Plummer, Zenobia L. Jacobs, Bo Li, Renaud Joannes-Boyau,
Gilbert Price, Yue-xing Feng & Christian A. Tryon (2016)
Unexpected Convergent Evolution of Nasal Domes between Pleistocene
Bovids and Cretaceous Hadrosaur Dinosaurs.
Current Biology (advance  online publication)
DOI: 
https://urldefense.proofpoint.com/v2/url?u=http-3A__dx.doi.org_10.1016_j.cub.2015.12.050&d=CwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=qw9lfxgHKLtUBa0vZ-H9raTEwd-y6L0x1lUEt5JrAl0&s=dRIxe5NWWO0zTcvnzO5rgk7h3e7IKEoz4AEuOQZGlCU&e=
 
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cell.com_current-2Dbiology_abstract_S0960-2D9822-2815-2901581-2DX&d=CwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=qw9lfxgHKLtUBa0vZ-H9raTEwd-y6L0x1lUEt5JrAl0&s=gSldeLm_ctH-ZXASFXU8wcL810Jbgc3330UTTwsSrc0&e=
 

pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cell.com_current-2Dbiology_pdf_S0960-2D9822-2815-2901581-2DX.pdf&d=CwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=qw9lfxgHKLtUBa0vZ-H9raTEwd-y6L0x1lUEt5JrAl0&s=J0vI_xufmBiVk1epYhOmtVnHCF889bLz1tdFKaIGf-I&e=
 

Highlights
•Pleistocene Rusingoryx atopocranion are first known mammals with
hollow nasal crests
•Rusingoryx ontogeny and evolution are broadly similar to
lambeosaurine hadrosaurs
•The best-supported nasal crest function is phonic modification
•Combination of convergent ontogeny, evolution, and function may
explain crest rarity

Summary
The fossil record provides tangible, historical evidence for the mode
and operation of evolution across deep time. Striking patterns of
convergence are some of the strongest examples of these operations,
whereby, over time, similar environmental and/or behavioral pressures
precipitate similarity in form and function between disparately
related taxa. Here we present fossil evidence for an unexpected
convergence between gregarious plant-eating mammals and dinosaurs.
Recent excavations of Late Pleistocene deposits on Rusinga Island,
Kenya, have uncovered a catastrophic assemblage of the wildebeest-like
bovid Rusingoryx atopocranion. Previously known from fragmentary
material, these new specimens reveal large, hollow, osseous nasal
crests: a craniofacial novelty for mammals that is remarkably
comparable to the nasal crests of lambeosaurine hadrosaur dinosaurs.
Using adult and juvenile material from this assemblage, as well as
computed tomographic imaging, we investigate this convergence from
morphological, developmental, functional, and paleoenvironmental
perspectives. Our detailed analyses reveal broad parallels between R.
atopocranion and basal Lambeosaurinae, suggesting that osseous nasal
crests may require a highly specific combination of ontogeny,
evolution, and environmental pressures in order to develop.

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News:

https://urldefense.proofpoint.com/v2/url?u=http-3A__phys.org_news_2016-2D02-2Dancient-2Dwildebeest-2Dlike-2Danimal-2Dbizarre-2Dfeature.html&d=CwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=x82f3Wlkwtmbr1z8IAt9jA&m=qw9lfxgHKLtUBa0vZ-H9raTEwd-y6L0x1lUEt5JrAl0&s=o1xEVtDDxx3qbNfkN1-TlH70yL15-ZtFRoYxXqbxjro&e=