The origin, phylogeny and radiation of early tetrapods and their relatives among the lobe-finned fish. The "fish-tetrapod" transition, and the evolution of terrestriality. Timing and sequence of skeletal and other changes which occurred during the transition, and the origin and relationships of the diverse tetrapods of the Late Palaeozoic. Origins of the modern radiations of tetrapods

Pierce, S. E., Clack J. A. and Hutchinson J. R. 2012. Three-dimensional limb joint mobility in the early tetrapod Ichthyostega. Nature. 486:523-526 Smithson, T.R., Wood, S.P., Marshall, J.E.A. and Clack, J.A. 2012. Earliest Carboniferous tetrapod and arthropod faunas from Scotland populate Romer's Gap. Proceedings of the National Academy of Sciences. 109:4532-4537 Clack, J.A. 2012. Gaining ground: the origin and evolution of tetrapods. Second Edition. Indiana University Press. Bloomington, Indiana, USA. 523 pp Pierce, S. E., Clack J. A. and Hutchinson J. R. 2011. Comparative axial morphology in pinnipeds and its correlation with aquatic locomotory behaviour. Journal of Anatomy (pagination tba) Clack. J. A. and Milner, A. R. 2010. The Morphology and Systematics of the Pennsylvanian Amphibian Platyrhinops lyelli (Amphibia: Temnospondyli). Transactions of the Royal Society of Edinburgh, Earth and Environmental Sciences 100, 275-295 Clack, J. A. 2009 The fish - tetrapod transition: new fossils and interpretations. Evolution: Education and Outreach. 2:213-223 Kimmel, C, Sidlauskas, B. and Clack, J. A. 2009 Linked morphological changes during palate evolution in early tetrapods. Journal of Anatomy 215: 91-109 doi: 10.1111/j.1469-7580.2009.01108.x Clack, J. A. and Klembara J. 2009 An articulated specimen of a chroniosuchid from the Late Permian of Russia. Special Papers in Palaeontology. 81:15-42 Clack, J. A. (2009) The fin to limb transition: new data, intepretations, and hypotheses from paleontology and developmental biology. Annual Review of Earth and Planetary Sciences. 37: 163-179 Callier, V., Clack, J. A., Ahlberg, P. E. (2009) Contrasting ontogenetic trajectories in the earliest known tetrapod forelimbs. Science. 324, 364-367. DOI: 10.1126/science.1167542 Ahlberg, P.E., Clack, J. A., Luksevics, E., Blom, H. and Zupins I. (2008) Ventastega curonica and the origin of tetrapod morphology. Nature 453, 1199-1204 Clack, J. A., (2007) Devonian climate change, breathing, and the origin of the tetrapod stem group. Integrative and Comparative Biology, 47: 510-523 Ruta, M. and Clack, J. A. (2006) A review of Silvanerpeton miripedes, a stem amniote from the Lower Carboniferous of East Kirkton, West Lothian, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, 97, 31-63 Clack, J. A. (2006) The emergence of early tetrapods. Palaeogeography, Palaeoclimatoogy, Palaeoecology. 232, 167-189 Clack, J. A. (2005) Making headway and finding a foothold: tetrapods come ashore. In: Evolving form and function: fossils and development. D. E. G. Briggs, (ed.) Peabody Museum of Natural History Special Publications, Yale University. pp 223-244. Ahlberg, P. E., Clack, J. A. and Blom, H. (2005) The axial skeleton of the Devonian tetrapod Ichthyostega. Nature. 437, 137-140 *Clack, J. A., Ahlberg P. E., Finney, S. M, Dominguez Alonso P., Robinson, J and Ketcham, R. A. 2003. A uniquely specialised ear in a very early tetrapod. Nature. 425, 65-69 Clack, J.A. (2002). Gaining ground: the origin and evolution of tetrapods. Indiana University Press. Bloomington, Indiana, USA. 369 pp