Conference Abstracts
Total: 100 conference abstracts
2025
Coming soon.
2024
99. Bateman, H.* & T.A. Hegna. 2024. Investigation of a unique end-Devonian extinction locality in western New York. 12th North American Paleontological Convention. June 17-21, Ann Arbor, MI. [poster]
* denotes SUNY Fredonia undergraduate student
98. Pankowski, M.V.°, M.G. Pankowski°, & T.A. Hegna. 2024. The Devonian-Carboniferous diversity of clam shrimp (Crustacea: Branchiopoda: Laevicaudata, Spinicaudata, Cyclestherida): A preliminary report. 12th North American Paleontological Convention. June 17-21, Ann Arbor, MI. [poster]
° denotes a high school student
97. Hegna, T.A. & S.R. Losso. 2024. How to eat with a fork: Unprecedented post-antennal appendage differentiation in the trilobite Isotelus (Asaphida; Ordovician). 12th North American Paleontological Convention. June 17-21, Ann Arbor, MI. [talk]
96. Bateman, H.* & T.A. Hegna. 2024. Investigation of a unique end-Devonian extinction locality in western New York. Earth Science Student Forum, Buffalo Museum of Science, Buffalo, NY. [poster]
* denotes SUNY Fredonia undergraduate student
95. Lamberton, S.*, Rangnekar, I.P.*, Rigney, F.*, Glow, J.*, Hegna, T.A., Tucker, P. & Decker, D. 2024. The Art of Natural History: 3D Printing a Skull Collection. Earth Science Student Forum, Buffalo Museum of Science, Buffalo, NY. [poster]
* denotes SUNY Fredonia undergraduate student
94. Echevarria, R.* & T.A. Hegna. 2024. An ontogenetic study of a newly discovered population of Cyzicus gynecius (Crustacea: Branchiopoda: Spinicaudata) from Mud Lake (Cassadaga, NY) using SEM imagery. Earth Science Student Forum, Buffalo Museum of Science, Buffalo, NY. [poster]
* denotes SUNY Fredonia undergraduate student
93. Echevarria, R.* & T.A. Hegna. 2024. An ontogenetic study of clam shrimp using SEM imagery. Sigma Xi Student Showcase, virtual. [received 2nd place in the undergraduate division]
Awarded 2nd place for best poster in the undergraduate division
* denotes SUNY Fredonia undergraduate student
2023
93. Poschmann, M.J., T.A. Hegna, T.I. Astrop, & R. Hoffmann. 2022. Early colonization of non-marine habitats by clam shrimp—A new perspective from the Devonian(Emsian) Klerf Formation in Germany. Geological Society of America Annual Meeting, Pittsburgh, PA. [talk by Hegna]
92. Melim, L.A., A. S. Terrile*, T.A. Hegna, B.J. Bellott, & R. Lerosey-Aubril. 2023. New evidence for bacterial mediation of the silicification of carbonate fossils. Geological Society of America Annual Meeting, Pittsburgh, PA. [poster]
* denotes WIU undergraduate student
2022
91. Melim, L.A., S.R. Mure-Ravaud*, T.A. Hegna, B.J. Bellott, & R. Lerosey-Aubril. 2022. Silicification of trilobites and biofilm from the Cambrian Weeks Formation, Utah: Evidence for microbial mediation. 6th International Palaeontological Congress, Khon Kaen, Thailand, 7-11 November. [poster]
* denotes WIU undergraduate student
90. Hegna, T.A. 2022. A fossil and phylogenetic perspective on marine-freshwater and freshwater-marine transitions in branchiopod crustaceans. Geological Society of America Annual Meeting, Denver, CO. [talk] [link]
89. Hegna, T.A., A. Perez-Huerta, R. Greenberger, A. Brodskii. 2022. Cones and Prisms: Possible Sexual Dimorphism in the Holochroal Eye Structure of Asaphid Trilobites. Geological Society of America Annual Meeting, Denver, CO. [poster] [link]
88. Hegna, T.A. 2022. Species, Vague Boundaries, and Biodiversity: Reframing Woodger's Paradox. William T. and Charlotte N. Hagan Young Scholar/Artist Award Ceremony Lecture, SUNY Fredonia, Fredonia, NY.
87. Hegna, T.A. 2022. Species, Vague Boundaries, and Reframing Woodger's Paradox. The Future of the Past: Philosophical Issues in the "Historical Sciences." August 8-9th, Jerusalem, Israel. [talk] (https://fotp2022.wordpress.com/)
86. Bogan, B. & Hegna, T.A. 2022. A new method of morphometric analysis for extant and extinct notostracans. Society for Integrative and Comparative Biology Annual Meeting, Phoenix, AZ. [poster]
2021
83. Monferran, M.D. & T.A. Hegna. 2021. An end-Triassic survivor?: A possible euthycarcinoid arthropod from the Jurassic of Argentina. Geological Society of America, Annual Meeting, Portland, OR. [poster] [link]
82. Bradbury, M.* & T.A. Hegna. 2021. Small shellies in the late Cambrian?—Enigmatic silicified shelly fossils from the St. Charles Formation, Late Cambrian (Furongian) of Southeastern Idaho, USA. Geological Society of America, Annual Meeting, Portland, OR. [poster] [link]
* denotes SUNY Fredonia undergraduate student
81. Van Houte, E.*, T.A. Hegna, & A. Butler. 2021. A new genus and species of ?parthenogenic anostracan (Crustacea, Branchiopoda, ?Thamnocephalidae) from the Cretaceous Koonwarra Fossil Beds in Australia. Geological Society of America, Annual Meeting, Portland, OR. [poster] [link]
* denotes SUNY Fredonia undergraduate student
80. Melim, L.A., S.R. Mure-Ravaud*, T.A. Hegna, B.J. Bellott, & R. Lerosey-Aubril. 2021. Complex SEM fabrics in Silicified trilobties from the Cambrian Weeks Formation: Clues to the process of silicification. Geological Society of America, Annual Meeting, Portland, OR. [poster] [link]
* denotes WIU undergraduate student
79. Monferran, M.D., D.E. Perez, O.F. Gallego, & T.A. Hegna. 2021. Phylogenetic analysis of the family Afrogratidae (Branchiopoda-Diplostraca-Estheriellina). Geological Society of America, Annual Meeting, Portland, OR. [poster] [link]
2020
78. Konstans, N.*, T.A. Hegna, & D.C. Rogers. 2020. Modern clam shrimp ornamentation patterns as a key to the past. 64th Annual Meeting of the Palaeontological Association, Oxford, UK, Dec. 16-18. [poster]
* denotes SUNY Fredonia undergraduate student
77. Hegna, T.A. 2020. The taxonomy of Orthestheria shupei (Stephenson, in Stephenson & Stenzel, 1952) from the Cenomanian (Cretaceous) of Texas. 64th Annual Meeting of the Palaeontological Association, Oxford, UK, Dec. 16-18. [poster]
2019
76. Hegna, T.A. 2019. Lineage-thinking, or the conceptual non-necessity of species and its implications. Paleontological Research Institution’s Summer Symposium, August 2019. [talk]
75. Konstans, N.*, T.A. Hegna, & D.C. Rogers. 2019. The Utility of Clam Shrimp (Branchiopoda: Laevicaudata, Spinicaudata, Cyclestherida) Carapace Ornamentation Patterns: A Rosetta Stone for Understanding Modern and Fossil Clam Shrimp Phylogeny. The Crustacean Society Mid-Year Meeting, Hong Kong, May 26-30, 2019. [poster]
* denotes WIU undergraduate student
74. Hoenig, C. L.* & T.A. Hegna. 2019. Multistate vs. binary characters in a real analysis of calmanostracan crustaceans. The Crustacean Society Mid-Year Meeting, Hong Kong, May 26-30, 2019. [poster]
* denotes WIU undergraduate student
73. Hegna, T.A. 2019. The systematic schism in clam shrimp study—working toward its resolution. The Crustacean Society Mid-Year Meeting, Hong Kong, May 26-30, 2019. [talk]
72. Hegna, T.A. 2019. The fossil record of 'conchostracans.' The Crustacean Society Mid-Year Meeting, Hong Kong, May 26-30, 2019. [talk]
71. Broda K., Rak Š., & Hegna T.A. 2019. A study of Concavicarididae and Protozoeidae (?Crustacea, Thylacocephala) carapace micro-ornamentation. The Crustacean Society Mid-Year Meeting, Hong Kong, May 26-30, 2019. [poster]
70. Park, T.-Y., T.A. Hegna, B. Bomfleur, & G.D.F. Wilson. 2019. Jurassic phreatoicid isopods from Victoria Land, Antarctica. The Crustacean Society Mid-Year Meeting, Hong Kong, May 26-30, 2019. [poster]
69. Park, T.-Y., T.A. Hegna, B. Bomfleur, & G.D.F. Wilson. 2019. Jurassic phreatoicid isopods from Victoria Land, Antarctica. 8th International Conference on Fossil Insects, Arthropods and Amber, April 7th to 11th 2019, Santo Domingo, Dominican Republic. [poster]
68. Broda K., Rak Š., & Hegna T.A. 2019. Micro-ornamentation patterns of 13 different thylacocephalan species. ZOOLOGICKÉ DNY Brno 2019, 7-8.02.2019, Brno, Czech Republic. Sborník abstraktů z konference, pp. 36-37. [poster]
67. Broda K., Rak Š., & Hegna T.A. 2019. Do the clothes make the thylacocephalan? A study of Concavicarididae and Protozoeidae (?Crustacea, Thylacocephala) carapace micro-ornamentation. 7th Symposium on Mesozoic and Cenozoic Decapod Crustaceans, June 17-21, 2019, Ljubljana, Slovenia. [poster]
2018
66. Hegna, T.A. 2018. Lineage-thinking, or the conceptual non-necessity of species and its implications. Geological Society of America Annual Meeting, Indianapolis, IN. [talk] [link]
65. Synder, K.*, Hegna, T.A., Synder, D., Darroch, S.A.F. 2018. EDS and CT analysis of a Triassic silicified Pteronisculus sp. nodule found in northern Madagascar. Geological Society of America Annual Meeting, Indianapolis, IN. [poster] [link]
* denotes WIU undergraduate student
64. Pankowski, M.K.*, Pankowski, M.J.*, Hegna, T.A. 2018. Legacy data in phylogenetics and a re-analysis of mid-Paleozoic phacopid phylogeny. Geological Society of America Annual Meeting, Indianapolis, IN. [poster] [link]
* denotes a high school student
63. Hegna, T.A. 2018. The fossil record of branchiopod crustaceans. 9th International Crustacean Congress, Washington, DC. [talk]
62. Hegna, T.A., A.D. Czaja, & D.C. Rogers. 2018. Raman spectroscopic analysis of the composition of clam shrimp (Laevicaudata, Spinicaudata, Cyclestherida) carapaces: a novel dual mineralization system. 9th International Crustacean Congress, Washington, DC. [poster]
61. Elsea, P.K.*, S. Voigt, & T.A. Hegna. 2018. Almatium sp. from the middle to late Triassic Madygen Formation, SW Kyrgyzstan and the structure of the Calmanostraca. 9th International Crustacean Congress, Washington, DC. [poster]
* denotes WIU undergraduate student
60. Hegna, T.A. 2018. The fossil record of large branchiopod crustaceans. North Central Section Meeting of the Geological Society of America, Ames, IA. [link] [poster]
59. Hegna, T.A., A.D. Czaja, & D.C. Rogers. 2018. Raman spectroscopic analysis of the composition of clam shrimp (Laevicaudata, Spinicaudata, Cyclestherida) carapaces: implications for the fossil record. North Central Section Meeting of the Geological Society of America, Ames, IA. [link] [poster]
58. Elsea, P.K.*, S. Voigt, & T.A. Hegna. 2018. Almatium sp. from the middle to late Triassic Madygen Formation, SW Kyrgyzstan and the phylogenetic structure of the Calmanostraca. North Central Section Meeting of the Geological Society of America, Ames, IA. [link] [poster]
* denotes WIU undergraduate student
2017
57. Hegna, T.A., R.R. Gaines, J. Ortega-Hernández, P. Van Roy, & R. Lerosey-Aubril. 2017. The phylogenetic placement of the arthropods from the Cambrian Weeks Formation. International Workshop on Evolution of Cambrian Arthropods. 1-6 Sept., Xi'an, China.
2016
56. Hegna, T.A. 2016. The amber window and the amphipod fossil record. Geological Society of America Annual Meeting, Denver, CO. [link]
55. Hegna, T.A., R. Gaines, J. Ortega-Hernández, & R. Lerosey-Aubril. 2016. New engimas in the patterns of silicification from the Cambrian Weeks Formation Lagerstätte. North Central Section Meeting of the Geological Society of America, Champaign, IL. [link]
54. Hegna, T.A., J. Christensen*, N. Liming*, C. Peters-Kaffenberger*, H. Starr*, A. Turner*, R. Gaines, P. Van Roy, J. Ortega-Hernández, & R. Lerosey-Aubril. 2016. The Biota of the Cambrian Weeks Formation Lagerstätte, House Range, Utah. North Central Section Meeting of the Geological Society of America, Champaign, IL. [link]
* denotes WIU undergraduate student
53. Santana Oliveira, R.*, T.A. Hegna, & R. Lerosey-Aubril. 2016. Preliminary work on the ontogenies of trilobites from the Weeks Formation (Cambrian; Utah). North Central Section Meeting of the Geological Society of America, Champaign, IL. [link]
* denotes WIU undergraduate student
52. Cavett, K.*, T.A. Hegna, & C. Sperry. 2016. Outcrop mapping in Argyle Lake State Park using LiDAR slope mapping. North Central Section Meeting of the Geological Society of America, Champaign, IL. [link]
* denotes WIU undergraduate student
2015
51. Lerosey-Aubril, R., J. Ortega-Hernández, R.R. Gaines, T.A. Hegna, & P. Van Roy. 2015. Remarkable lophotrochozoans from the Weeks Formation Konservat-Lagerstätte. 59th Annual Meeting of the Palaeontological Association, Cardiff, Wales, UK.
50. Hegna, T.A. & M. Martin. 2015. Pyritized in situ trilobite eggs from the Ordovician of New York (Lorraine Group): Implications for trilobite reproductive biology. Geological Society of America Annual Meeting, Baltimore, MD. [link]
49. Hegna, T.A. 2015.Trilobites as arthropods: the implications of the arthrodial membrane for trilobite taphonomy. Geological Society of America Annual Meeting, Baltimore, MD. [link]
48. Hegna, T.A., T.P.H. Harvey, & P. Huber. 2015. Possible minute branchiopod mandibles (?Cladocera) from the lake deposits (Ciniza Lake) in the Upper Triassic Chinle Formation (New Mexico) and the temporal record of small carbonaceous fossils (SCFs). Geological Society of America Annual Meeting, Baltimore, MD. [link]
47. Hegna, T.A., M. Martin, & Soriano, C. 2015. Pyritized in situ trilobite eggs from the Ordovician of New York (Lorraine Group): Implications for trilobite reproductive biology. North Central Section Meeting of the Geological Society of America. [link]
46. Juron, M.K.*, T.A. Hegna, & M. Martin. 2015 Possible trilobite-in-trilobite sheltering behavior (Silurian Gun River Formation, Anticosti Island, Canada). North Central Section Meeting of the Geological Society of America. [link]
* denotes WIU undergraduate student
45. Liming, N.*, C. Peters*, T.A. Hegna, R. Lerosey-Aubril, & R. R. Gaines. 2015. Silicification of trilobites in the Cambrian Weeks Formation (House Range, Utah). North Central Section Meeting of the Geological Society of America. [link]
* denotes WIU undergraduate student
44. Ososky, S.* & T.A. Hegna. 2015. Mississippian bryozoans preserved in glauconite (Illinois, USA). North Central Section Meeting of the Geological Society of America. [link]
* denotes WIU undergraduate student
43. Starr, H.*, T.A. Hegna, & M.A.S. McMenamin. 2015. Epilogue to the tale of the Triassic Amphipod: Rosagammarus is a decapod tail (Luning Formation, Nevada). North Central Section Meeting of the Geological Society of America. [link]
* denotes WIU undergraduate student
2014
42. Hegna, T. A. & Snyder, D. 2014. "Horse collars" are for balancing? The function of an enigmatic Devonian fossil re-examined with 3D visualization. 10th North American Paleontological Convention. Gainsville, FL. [poster]
2013
41. Lagebro, L., P. Gueriau, T.A. Hegna, N. Rabet, and G.E. Budd. 2013. The earliest head-shield-bearing Calmanostraca found in the Upper Devonian Strud Lagerstätte, Belgium. 57th Annual Meeting of the Palaeontological Association, Zurich, Switzerland. 13-16 Dec.
40. Lerosey-Aubril, R., R. Gaines, T.A. Hegna, J. Ortega-Hernández, L.E. Babcock, B. Lefebvre, C. Kier, E. Bonino, Q. Sahratian & J. Vannier. 2013. Composition and significance of the Weeks Formation Fauna (Guzhangian; Utah, USA). 57th Annual Meeting of the Palaeontological Association, Zurich, Switzerland. 13-16 Dec.
39. Hegna, T.A., M. d. L. Serrano-Sánchez, F.J. Vega & E. Lazo-Wasem. 2013. Not quite frozen in time: windows into the internal taphonomy of fossils in amber via microCT-scan technology. Geological Society of America Annual Meeting, Denver, CO. [talk]
38. Knecht, B.J.*, T.A. Hegna & R. Garwood. 2013. The Carboniferous whip spider Graeophonus (Arachnida: Amblypygi): New data on pedipalp evolution. Geological Society of America, Annual Meeting, Denver, CO [poster] [link]
* denotes WIU undergraduate student
37. Hegna, T. A., F.J. Vega & K.A. González-Rodríguez. 2013. First Mesozoic Thylacocephalans (Arthropoda, ?Crustacea; Cretaceous) in the western hemisphere: New discoveries from the Muhi Quarry Lagerstätte, México. Geological Society of America Annual Meeting, Denver CO. [poster] [link]
36. Lerosey-Aubril, R., R. Gaines, T.A. Hegna, J. Ortega-Hernández, L.E. Babcock, B. Lefebvre, C. Kier, E. Bonino, Q. Sahratian & J. Vannier. 2013. The Weeks Formation Lagerstätte (Cambrian; Utah, USA): a unique insight into the evolution of soft-bodied metazoans during the late Cambrian. Geological Society of America Annual Meeting, Denver, CO. [talk] [link]
2012
35. Lerosey-Aubril, R., Vannier, J., Hegna, T.A., Kier, C. & Bonino, E. 2012. Inside the Cambrian explosion: the diversity of midgut morphologies in Cambrian arthropods. 56th Annual Meeting of the Palaeontological Association, Dublin, Ireland.
34. Hegna, T. A., Lerosey-Aubril, R., Bonino, E. & Kier, C. 2012. The interpretation of a new enigmatic arthropod from the Cambrian Weeks Formation, Utah. 56th Annual Meeting of the Palaeontological Association, Dublin, Ireland. Poster.
33. Wolfe, J. M. and Hegna, T.A. 2012. Testing the phylogenetic position of Cambrian 'Orsten' pancrustacean larval stages using semaphoront coding. 56th Annual Meeting of the Palaeontological Association, Dublin, Ireland.
32. Hegna, T.A. 2012. Stem-ward slippage and the relevance of arthropod decay for interpreting fossil morphology: a new look at Strudiella and Ebullitiocaris. Annual Meeting of the Geological Society of America (Charlotte, NC). November 3-7th, 2012.
31. Knecht, B.*, R.J. Garwood & T.A. Hegna. 2012. First CT-scan reconstruction of Graeophonus, a late Carboniferous whip spider (Arachnida: Amblypygi) from Coseley, Staffordshire, UK. Annual Meeting of the Geological Society of America (Charlotte, NC). November 3-7th, 2012.
* denotes WIU undergraduate student
30. Hegna, T.A., R. Lerosey-Aubril, E. Bonino & C. Kier. 2012. A new enigmatic arthropod from the Cambrian Weeks Formation, Utah. Annual Meeting of the Geological Society of America (Charlotte, NC). November 3-7th, 2012.
29. McRoberts, C., T.A. Hegna, J. Burke, M.L. Stice*, S. Mize & M. Martin. 2012. Original spotted patterns on Middle Devonian phacopid trilobites from western and central New York. Annual Meeting of the Geological Society of America (Charlotte, NC). November 3-7th, 2012.
* denotes WIU undergraduate student
28. Lerosey-Aubril, R., T.A. Hegna, X.-J. Zhu & R.J. Garwood. 2012. Morphology and taphonomy of trilobite guts: recent developments and perspectives. The 5th Conference on Trilobites and their relatives, Prague, Czech Republic, Abstracts. p. 37.
27. Lerosey-Aubril, R., T.A. Hegna, C. Kier, E. Bonino, J. Habersetzer & M. Carré. 2012. Exploring the preservation of digestive structures of fossil arthropods: The phosphatisation of trilobite guts in the Weeks Formation Lagerstätte (Cambrian; Utah). Journal of Guizhou University (Natural Science). vol. 29(suppl. 1): 171-172. [The 17th Field Conference of the Cambrian Stage Subdivision Working Group, International Subcommission on Cambrian Stratigraphy and Celebration of the 30th Anniversary of the Discovery of the Kaili Biota]
2011
26. Wolfe, J. M. & T.A. Hegna. 2011. Semaphoronts and the phylogenetic position of fossil pancrustacean larvae. 55th Annual Meeting, Palaeontological Society Association, December 17th-20th, Plymouth University, UK.
25. Hegna, T. A. & D. E. G. Briggs. 2011. Unmineralized exoskeletal morphology of Isotelus (Arthropoda, Trilobita, Asaphida); Possible evidence of cephalic limb differentiation. Annual Meeting of the Geological Society of America; Minneapolis, MN. [link]
24. Hegna, T. A. 2011. New insights on notostracan limb differentiation and evolution and its implications for calmanostracan phylogeny. 2nd International Congress on Invertebrate Morphology, Harvard University, Cambridge, MA.
23. Lerosey-Aubril, R., T. A. Hegna, C. Kier, E. Bonino, M. Carré & J. Habersetzer. 2011. Trilobite guts: an inside look at the morphology and its mechanism of preservation. 2nd International Congress on Invertebrate Morphology, Harvard University, Cambridge, MA.
22. Wolfe, J. M. & Hegna, T. A. 2011. Testing the phylogenetic position of fossil pancrustacean larvae: a semaphoront-based coding system. 2nd International Congress on Invertebrate Morphology, Harvard University, Cambridge, MA.
21. Lerosey-Aubril, R., Kier, C., Bonino, E., Hegna, T. A., Carré, M., & Habersetzer, J. 2011. The digestive system of the trilobites from the Weeks Formation (Middle Cambrian, USA): a unique insight into the paleobiology of primitive arthropods. 2nd German Trilobite Symposium, Frankfurt, Germany.
20. Vega, F. J., Hegna, T. A., Lazo-Wasem, E. A., & Zúñiga, L. 2011. Implicaciones paleobiológicas y paleoambientales de los crustáceos semiacuáticos en amber del Mioceno Inferior de Simojovel, Chiapas. XII Congreso Nacional de Paleontología Edificio Carolino, Benemérita Universidad Autónoma de Puebla.
19. Astrop, T. A. & Hegna, T. A. 2011. An integrative assault on clam shrimp ('Conchostraca'; Branchiopoda; Crustacea) Paleobiology and Phylogeny. GSA Northeastern & North-Central Joint Regional Meeting (20–22 March 2011) in Pittsburgh, PA. [link]
18. Roberts, E. M., S. Perritt, H. A. Jelsma, T. A. Hegna. 2011. Mesozoic—early Cenozoic sedimentary cover sequences in the Kasai region of the Congo Basin. 23rd Colloquium of African Geology (2011), Johannesburg, South Africa.
17. Hegna, T. A. 2011. Living fossils? The phylogeny and fossil record of branchiopod crustaceans. 2011 Annual Meeting of the Society for Integrative and Comparative Biology, Salt Lake City, UT.
16. °Hegna, T. A. 2011. Fossil insights on notostracan limb differentiation and evolution. 2011 Annual Meeting of the Society for Integrative and Comparative Biology, Salt Lake City, UT.
°recipient of the Crustacean Society’s best student poster award
2010
15. Lerosey-Aubril, R. & T. A. Hegna. 2010. The morphological variability of the trilobite digestive system: insights from the frontal auxiliary impressions. 54th Annual Meeting of the Palaeontological Association, Ghent, Belgium.
14. Hegna, T. A. 2010. The fossil record of branchiopod crustaceans: Stasis no more? Annual Meeting of the Geological Society of America; Denver, CO. [link]
13. Hegna, T. A., Vega, F. J., & Lazo-Wasem, E. A. 2010. MicroCT investigation of a new genus and species of Amphipoda (Crustacea: Malacostraca: Talitridae) preserved in amber from the lower Miocene of Chiapas, Mexico. Annual Meeting of the Geological Society of America; Denver, CO. [link]
12. Lerosey-Aubril, R. & T. A. Hegna. 2010. Inferring internal anatomy from the trilobite exoskeleton: the relationship between frontal auxiliary impressions and the digestive system. 80th meeting of Paläontologischen Gesellschaft (the German Palaeontological Society) at Ludwig-Maximilians-Universität München, Germany.
11. Lerosey-Aubril, R., Kier, C., Bonino, E. & T. A. Hegna. 2010. Reading the entrails of . . . trilobites: A unique insight into the palaeobiology of early arthropods. 80th meeting of Paläontologischen Gesellschaft (the German Palaeontological Society) at Ludwig-Maximilians-Universität München, Germany.
10. Hegna, T. A. 2010. The fossil record of branchiopod crustaceans. Fossil Insect, Arthropod and Amber Conference, Beijing, China.
9. Hegna, T. A. & D. Ren. 2010. Two new “notostracans”, Chenops gen. nov. and Jeholops gen. nov. (Crustacea: Branchiopoda: ?Notostraca) from the Yixian Formation, northeastern China. Fossil Insect, Arthropod and Amber Conference, Beijing, China.
8. Vega, F. J., Hegna, T.A. & E. A. Lazo-Wasem. 2010. MicroCT Investigation of a Unique, Crustacean-Bearing (Amphipoda, Ostracoda) Piece of Lower Miocene Amber from Chiapas, Mexico. Fossil Insect, Arthropod and Amber Conference, Beijing, China.
2009
7. Hegna, T.A. 2009. Decay experiments on lightly sclerotized arthropods (Branchiopoda, Crustacea) and the death of the oldest ‘living fossil’ species, Triops cancriformis. Annual Meeting of the Geological Society of America; Portland, OR. [link]
2008
6. Hegna, T.A. 2008 The function of forks: the asaphid-type hypostome. 52nd Annual Meeting of the Palaeontological Association, Glasgow, UK. [talk]
5. Pickering, J., J. Alonzo, D. E. G. Briggs & T.A. Hegna. 2008. GEODES: Increasing Diversity of Geoscience Students through Museum-Based High School Programs. Geological Society of America Annual Meeting, Houston, TX. [link]
4. Hegna, T.A. 2008. Cladistic analysis of ptychaspidid trilobites (Upper Cambrian), and a new hypothesis of ingroup relationships. 4th International Trilobite Confernce, Toledo, Spain. [talk]
2006
3. 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. 50th Annual Meeting of the Palaeontological Association, Sheffield, UK. [poster]
2004
2. Hegna, T.A. & J.M. Adrain. 2004. Reduced biofacies differentiation in Silurian trilobite faunas of Laurentia. Geological Society of America Annual Meeting; Denver, CO. [talk] [link]
2003
1. Hegna, T.A. & J.M. Adrain. 2003. Early Silurian trilobites from northeastern Missouri. Geological Society of America, North-Central Sectional Meeting; Kansas City, MO. [poster] [link]