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B329: Palaeontological and developmental approaches for resolving vertebrate phylogenetics and character evolution (Lead Supervisor: Robert Asher, Zoology)

Supervisors: Robert Asher (Zoology) and Jason Head (Zoology)

Importance of the area of research:

Many branches on life's evolutionary tree were well-established by the close of the 19th century; others have been resolved more recently; yet others remain contentious. Resolving the tree of life is important both in applied and theoretical biology, e.g., in interpreting animal models and testing hypotheses of character acquisition. Data relevant for phylogenetics come from many sources. Only a subset of these data sources are typically available for fossils, yet most species that have ever existed during the course of Earth History are now extinct. Methods to reconstruct and assesses confidence in phylogenetics (particularly among fossils) are therefore key.

Project summary:

By applying palaeontological datasets to test phylogenetic questions for species with well-corroborated positions on the Tree of Life, we can gauge the accuracy of a palaeontological dataset relative to soft-tissues and DNA. We will also extract character data from vertebrate species using histology and microCT, combining with DNA where feasible.

What the student will do:

The student will formulate and test hypotheses on vertebrate evolution by collecting comparative anatomical data on living and fossil species using collections-based research, microCT, and/or histology. Heuristic tests of phylogenetic accuracy based on subsets of hard vs. soft tissues and DNA are also relevant. Where available, the student will also collect data on developmental changes to phenotype during the course of growth.

Please contact the lead supervisor directly for further information relating to what the successful applicant will be expected to do, training to be provided, and any specific educational background requirements.

References:

Asher RJ, Bennett N, Lehmann T. 2009. The new framework for understanding placental mammal evolution. Bioessays 31(8): 853-864.

Head JJ, Polly PD. 2015. Evolution of the snake body form reveals homoplasy in amniote Hox gene function. Nature. 2015 Apr 2;520(7545):86-9.

Pattinson DJ, Thompson RS, Piotrowski A, Asher RJ. 2015. Phylogeny, paleontology, and primates: do incomplete fossils bias the tree of life? Systematic Biology 64(2):169-186.

Follow this link to find out about applying for this project

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