Jason P. Downs

Jason P. Downs is an American vertebrate paleontologist, assistant professor of Biology at Delaware Valley University, and research associate at the Academy of Natural Sciences of Philadelphia.
Selected Publications
* Downs, J.P., E.B. Daeschler, F.A. Jenkins, Jr., and N.H. Shubin. 2013. Holoptychius bergmanni sp. nov. (Sarcopterygii, Porolepiformes) from the Late Devonian of Nunavut, Canada, and a review of Holoptychius taxonomy. Proceedings of the Academy of Natural Sciences of Philadelphia 162:147-159.
* Downs, J.P., K.E. Criswell, and E.B. Daeschler. 2011. Mass mortality of juvenile antiarchs (Bothriolepis sp.) from the Catskill Formation (Upper Devonian, Famennian Stage), Tioga County, Pennsylvania. Proceedings of the Academy of Natural Sciences of Philadelphia 161:191-203.
* Downs, J.P., E.B. Daeschler, N.H. Shubin and F.A. Jenkins, Jr. 2011. A new species of Laccognathus (Sarcopterygii, Porolepiformes) from the Late Devonian of Ellesmere Island, Nunavut, Canada. Journal of Vertebrate Paleontology 31(5):981-996.
* Downs, J.P. and P.C.J. Donoghue. 2009. Skeletal biology of Bothriolepis canadensis (Placodermi, Antiarchi) and evolution of the skeleton at the origin of jawed vertebrates. Journal of Morphology 270:1364-1380.
* Downs, J.P., E.B. Daeschler, F.A. Jenkins, Jr., and N.H. Shubin. 2008. The cranial endoskeleton of Tiktaalik roseae, Nature 455(7215).
* Shapiro, M.D., N.H. Shubin, and J. P. Downs. 2007. Limb diversity and digit reduction in reptilian evolution. In: Fins Into Limbs: Evolution, Development, and Transformation, Hall, B. K. (ed.). University of Chicago Press.
* Donoghue, P.C.J., I.J. Sansom, and J. P. Downs. 2006. Early evolution of vertebrate skeletal tissues and their interactions, and the canalization of skeletal development. Journal of Experimental Zoology Part B: Molecular and Developmental Evolution 306:278-294.
* Shapiro, M.D., H. You, N.H. Shubin, Z. Luo, and J. P. Downs. 2003. A large ornithomimid pes from the Lower Cretaceous of the Mazongshan Area, northern Gansu Province, People’s Republic of China. Journal of Vertebrate Paleontology 23(3):695-698.
* Downs, J.P. and E.B. Daeschler. 2001. Variation within a large sample of Ageleodus pectinatus teeth (Chondrichthyes) from the Late Devonian of Pennsylvania, U.S.A. Journal of Vertebrate Paleontology 21(4):811-814.

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