Thomas Hegna Graduate Email Me Office: no entry in db Research Interests: Trilobite and arthropod phylogeny and evolution, branchiopod crustaceans, segmentation in the notostracan Triops, carapace evolution, Cambrian life, the interface between molecules and morphology, the philosophical foundations of paleontology and systematics Selected Publication(s): Hegna, T. A. 2008. Cladistic analysis of ptychaspidid trilobites (Upper Cambrian), and a new hypothesis of ingroup relationships. In Advances in Trilobite Research, eds. I. Rabano, R. Gozalo, & D. Garcia-Bellido, 167-169. Madrid: Instituto Geologico y Minero de Espana. Hegna, T. A. & R. Lerosey-Aubril. 2007. Trilobite publications: Statistics for the year 2006. Trilobite Papers 19:4-7. Hegna, T. A. 2006. Systematics of Late Cambrian (Sunwaptan) trilobites from the St. Charles Formation, southeastern Idaho. Unpublished M.S. thesis, Department of Geoscience, University of Iowa, Iowa City, IA, 236 pgs. Hegna, T.A., & Adrain, J.M. 2004. Reduced biofacies differentiation in Silurian trilobite faunas of Laurentia. Abstracts with Programs Geological Society of America, vol. 36, pp. 177. Hegna, T. A., J. M. Adrain, & S. R. Westrop. 2006. Silicified Upper Cambrian (Sunwaptan) trilobites from the St. Charles Formation in the Bear River Range of southeastern Idaho. Palaeontological Association Annual Meeting Abstracts. Palaeontological Newsletter 63: 58.