Direct evidence of trophic interactions among apex predators in the Late Triassic of western North America

Abstract

Hypotheses of feeding behaviors and community structure are testable with rare direct evidence of trophic interactions in the fossil record (e.g., bite marks). We present evidence of four predation, scavenging, and/or interspecific fighting events involving two large paracrocodylomorphs (=‘rauisuchians’) from the Upper Triassic Chinle Formation (∼220–210 Ma). The larger femur preserves a rare history of interactions with multiple actors prior to and after death of this ∼8–9-m individual. A large embedded tooth crown and punctures, all of which display reaction tissue formed through healing, record evidence of a failed attack on this individual. The second paracrocodylomorph femur exhibits four unhealed bite marks, indicating the animal either did not survive the attack or was scavenged soon after death. The combination of character states observed (e.g., morphology of the embedded tooth, ‘D’-shaped punctures, evidence of bicarination of the marking teeth, spacing of potentially serial marks) indicates that large phytosaurs were actors in both cases. Our analysis of these specimens demonstrates phytosaurs targeted large paracrocodylomorphs in these Late Triassic ecosystems. Previous distinctions between ‘aquatic’ and ‘terrestrial’ Late Triassic trophic structures were overly simplistic and built upon mistaken paleoecological assumptions; we show they were intimately connected at the highest trophic levels. Our data also support that size cannot be the sole factor in determining trophic status. Furthermore, these marks provide an opportunity to start exploring the seemingly unbalanced terrestrial ecosystems from the Late Triassic of North America, in which large carnivores far outnumber herbivores in terms of both abundance and diversity.

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Abbreviations

FMNH UC:

Field Museum of Natural History University of Chicago collections, Chicago, Illinois, U.S.A.

FMNH PR:

Field Museum of Natural History Fossil Reptile collections, Chicago, Illinois, U.S.A.

GR:

Ruth Hall Museum at Ghost Ranch, New Mexico, U.S.A.

PVL:

Instituto Miguel Lillo, Tucuman, Argentina

PVSJ:

Division of Paleontology of the Museo de Ciencias Naturales, Universidad Nacional de San Juan, Argentina

TTU P:

Texas Tech University Museum of Paleontology, Lubbock, Texas, USA

UCMP:

University of California Museum of Paleontology, Berkeley, California, USA

UTCT:

The High-Resolution X-ray Computed Tomography Facility at The University of Texas at Austin, Austin, Texas, U.S.A

YPM:

Yale Peabody Museum, New Haven, Connecticut, USA

References

  1. Abel O (1922) Die Schnauzenverletzungen der Parasuchier und ihre biologische Bedeutung. Paläontol Z 5:26–57

    Article  Google Scholar 

  2. Atchley SC, Nordt LC, Dworkin SI, Ramezani J, Parker WG, Ash SR, Bowring SA (2013) A linkage among Pangean tectonism, cyclic alleviation, climate change, and biologic turnover in the Late Triassic: the record from the Chinle formation, Southwestern United States. J Sediment Res 83:1147–1161

    Article  CAS  Google Scholar 

  3. Bakker RT (1972) Anatomical and ecological evidence of endothermy in dinosaurs. Nature 238:81–85

    Article  Google Scholar 

  4. Barrett PM, Nesbitt SJ, Peecook BR (2014) A large-bodied silesaurid from the Lifua member of the Manda beds (Middle Triassic) of Tanzania and its implications for body-size evolution in Dinosauromorpha. Gondwana Res. doi:10.1016/j.gr.2013.12.015

    Google Scholar 

  5. Behrensmeyer AK (1981) Vertebrate paleoecology in a recent east African ecosystem. In: Gray J, Boucot AJ, Berry WBN (eds) Communities of the past. Hutchinson Ross Publishing Company, Stroudsburg, pp 591–615

    Google Scholar 

  6. Behrensmeyer AK, Damuth JD, DiMichele WA, Potts R, Sues H-D, Wing SL (1992) Terrestrial ecosystems through time: evolutionary paleoecology of terrestrial plants and animals. The University of Chicago Press, Chicago

    Google Scholar 

  7. Benton MJ, Tverdokhlebov VP, Surkov MV (2004) Ecosystem remodeling among vertebrates at the Permian–Triassic boundary in Russia. Nature 432:97–100

    PubMed  Article  CAS  Google Scholar 

  8. Binford LR (1981) Bones: ancient men and modern myths. Academic Press, New York

    Google Scholar 

  9. Boucot AJ (1990) Evolutionary paleobiology of behavior and coevolution. Elsevier Science Publishers, Amsterdam

  10. Boyd CA, Drumheller SK, Gates TA (2013) Crocodyliform feeding traces on juvenile ornithischian dinosaurs from the Upper Cretaceous (Campanian) Kaiparowitz Formation, Utah. PLoS One 8(2):e57605. doi:10.1371/journal.pone.0057605

  11. Brown CM, Evans DC, Campione NE, O’Brien LJ, Eberth DA (2013) Evidence for taphonomic size bias in the Dinosaur Park Formation (Campanian, Alberta), a model Mesozoic terrestrial alluvial-paralic system. Palaeogeogr Palaeoclimatol Palaeoecol 372:108–122

  12. Brusatte SL, Butler RJ, Niedźwiedzki G, Sulej T, Bronowicz R, Satkünas J (2012) First record of Mesozoic terrestrial vertebrates from Lithuania: phytosaurs (Diapsida: Archosauriformes) of probable Late Triassic age, with a review of phytosaur biogeography. Geol Mag 150:110–122. doi:10.1017/S0016756812000428

    Article  Google Scholar 

  13. Busby AB (1995) The structural consequences of skull flattening in crocodilians. In: Thomason JJ (ed) Functional morphology in vertebrate paleontology. Cambridge University Press, New York, pp 173–192

    Google Scholar 

  14. Byers SN (2005) Introduction to forensic anthropology: a textbook. Pearson/Allyn and Bacon, New York

    Google Scholar 

  15. Camp CL (1930) A study of the phytosaurs with description of new material from western North America. Mem Univ Calif 10:1–160

    Google Scholar 

  16. Campione NE, Evans DC (2012) A universal scaling relationship between body mass and proximal limb bone dimensions in quadrupedal terrestrial tetrapods. BMC Biol 10:60. doi:10.1186/1741-7007-10-60

  17. Campione NE, Evans, DC, Brown, CM, Carrano MT (2014) Body mass estimation in non-avian bipeds using a theoretical conversion to quadrupedal stylopodial proportions. Methods Ecol Evol. doi:10.1111/2041-210X.12226

  18. Charig AJ (1972) The evolution of the archosaur pelvis and hindlimb: an explanation in functional terms. In: Joysey KA, Kemp TS (eds) Studies in vertebrate evolution. Oliver & Boyd, Edinburgh, pp 121–155

    Google Scholar 

  19. Chatterjee S (1978) A primitive parasuchid (phytosaur) reptile from the Upper Triassic Maleri Formation of India. Palaeontol 21:83–127

  20. Cobos A, Lockley MG, Gascó F, Royo-Torres R, Alcalá L (2014) Megatheropods as apex predators in the typically Jurassic ecosystems of the Villar del Arzobispo Formation (Iberian Range, Spain). Palaeogeogr Palaeoclimatol Palaeoecol 399:31–41

  21. Colbert EH (1972) Vertebrates from the Chinle formation. In: Breed CS, Breed WJ (eds) Investigations in the Triassic Chinle Formation. Museum of Northern Arizona, Northland Press, Flagstaff, pp 1–11

  22. Cope ED (1869) Synopsis of the extinct Batrachia, Reptilia and Aves of North America. Trans Am Philos Soc New Ser 14:1–252

    Article  Google Scholar 

  23. Currie PJ, Jacobsen AR (1995) An azhdarchid pterosaur eaten by a velociraptorine theropod. Can J Earth Sci 32:922–925

    Article  Google Scholar 

  24. D’Amore DC, Blumenschine RJ (2009) Komodo monitor (Varanus komodoensis) feeding behavior and dental function reflected through tooth marks on bone surfaces, and the application to ziphodont paleobiology. Paleobiol 35(4):525–552

    Article  Google Scholar 

  25. Delaney-Rivera C, Plummer TW, Hodgson JA, Forrest F, Hertel F, Oliver JS (2009) Pits and pitfalls: taxonomic variability and patterning in tooth mark dimensions. J Archaeol Sci 36:2597–2608

    Article  Google Scholar 

  26. DePalma RA II, Burnham DA, Martin LD, Rothschild BM, Larson PL (2013) Physical evidence of predatory behavior in Tyrannosaurus rex. Proc Natl Acad Sci U S A. doi:10.1073/pnas.1216534110

    PubMed  PubMed Central  Google Scholar 

  27. Domínguez-Rodrigo M (2002) Hunting and scavenging by early humans: the state of the debate. J World Prehist 16(1):1–54

    Article  Google Scholar 

  28. Drumheller SK, Brochu CA (2014) A diagnosis of Alligator mississippiensis bite marks with comparisons to existing crocodylian datasets. Ichnos 21:131–146

    Article  Google Scholar 

  29. Erickson GM, Olson KH (1996) Bite marks attributable to Tyrannosaurus rex: preliminary description and implications. J Vertebr Paleontol 16(1):175–178

    Article  Google Scholar 

  30. Farlow JO, Hurlburt GR, Elsey RM, Britton ARC, Langston W (2005) Femoral dimensions and body size of Alligator mississippiensis: estimating the size of extinct Mesoeucrocodylians. J Vertebr Paleontol 25:354–369

    Article  Google Scholar 

  31. Franzen JL, Frey E (1993) Europolemur completed. Kaupia 3:113–130

    Google Scholar 

  32. Gauthier JA, Padian KP (1985) Phylogenetic, functional, and aerodynamic analyses of the origin of birds and their flight. In: Hecht JHOMK, Viohl G, Wellnhofer P (eds) The beginning of birds. Freunde des Jura Museums, Eichstatt, pp 185–197

    Google Scholar 

  33. Heckert AB (2004) Late Triassic microvertebrates from the lower Chinle Group (Otischalkian-Adamanian: Carnian), southwestern U.S.A. N M Mus Nat Hist Sci Bull 27:1–170

  34. Heckert AB, Lucas SG (2002) Lower Chinle Group (Upper Triassic: Carnian) stratigraphy in the Zuni Mountains, west-central New Mexico. N M Mus Nat Hist Sci Bull 21:51–72

  35. Heckert AB, Lucas SG, Sullivan RM, Hunt AP, Spielmann JA (2005) The vertebrate fauna of the Upper Triassic (Revueltian: Early-mid Norian) Painted Desert Member (Petrified Forest Formation: Chinle Group) in the Chama Basin, northern New Mexico. 56th Field Conference Guidebook, Geology of the Chama Basin, N. M. Geol. Soc. pp. 302–318

  36. Hungerbühler A (2000) Heterodonty in the European Phytosaur Nicrosaurus kapffi and its implications for the taxonomic utility and functional morphology of phytosaur dentitions. J Vertebr Paleontol 20(1):31–48

    Article  Google Scholar 

  37. Hunt AP (1989) Cranial morphology and ecology among phytosaurs. In: Lucas SG, Hunt AP (eds) Dawn of the age of dinosaurs in the American Southwest. New Mexico Museum of Natural History, Albuquerque, pp 349–354

    Google Scholar 

  38. Hunt AP, Downs A (2002) Taphonomy of the Late Triassic Canjilon Quarry (Petrified Forest Formation: Chinle Group), north-central New Mexico: data from new excavations. N M Mus Nat Hist Sci Bull 21:291–295

  39. Hurlburt GR, Heckert AB, Farlow JO (2003) Body mass estimates of phytosaurs (Archosauria: Parasuchidae) from the Petrified Forest Formation (Chinle Group: Revueltian) based on skull and limb bone measurements. N M Mus Nat Hist Sci Bull 24:105–113

  40. Iordansky NN (1973) The skull of the crocodilian. In: Gans C, Parsons T (eds) Biology of the Reptilia, vol 4. Academic Press, London, pp 201–262

    Google Scholar 

  41. Irmis RB (2011) Evaluating hypotheses for the early diversification of dinosaurs. Earth Environ Sci Trans R Soc 101:397–426

    Google Scholar 

  42. Irmis RB, Nesbitt SJ, Padian K, Smith ND, Turner AH, Woody D, Downs A (2007) A Late Triassic dinosauromorph assemblage from New Mexico and the rise of dinosaurs. Sci 317:358–361

    Article  CAS  Google Scholar 

  43. Irmis RB, Mundil R, Martz JW, Parker WG (2011) High-resolution U-Pb ages from the Upper Triassic Chinle Formation (New Mexico, USA) support a diachronous rise of dinosaurs. Earth Planet Sci Lett 309:258–267

  44. Jacobs LL, Murry PA (1980) The vertebrate community of the Triassic Chinle Formation near St. Johns, Arizona. In: Jacobs LL (ed) Aspects of vertebrate history: essays in honor of Edwin Harris Colbert. Museum of Northern Arizona Press, Flagstaff, pp 55–70

  45. Jacobsen AR (2001) Tooth-marked small theropod bone: an extremely rare trace. In: Tanke DH, Carpenter K (eds) Mesozoic vertebrate life. Indiana University Press, Bloomington, pp 58–63

    Google Scholar 

  46. Kidwell SM, Flessa KW (1996) The quality of the fossil record: Populations, species, and communities. Annu Rev Earth Pl Sc 24:433–464

  47. Kowalewski M (2002) The fossil record of predation: an overview of analytical methods. In: Kowalewski M, Kelley PH (eds) The fossil record of predation. The Paleontological Society Papers 8, Paleontological Society, Yale Printing Service, New Haven, pp 3–42

    Google Scholar 

  48. Läng E, Boudad L, Maio L, Samankassou E, Tabouelle J, Tong H, Cavin L (2013) Unbalanced food web in a Late Cretaceous dinosaur assemblage. Palaeogeogr Palaeoclimatol Palaeoecol 381–382:26–32

  49. Langston W (1973) The crocodilian skull in historical perspective. In: Gans C, Parsons T (eds) Biology of the Reptilia, vol 4. Academic Press, London, pp 264–284

    Google Scholar 

  50. Long RA, Murry PA (1995) Late Triassic (Carnian and Norian) tetrapods from the southwestern United States. N M Mus Nat Hist Sci Bull 4:1–254

    Google Scholar 

  51. Longrich NR, Horner JR, Erickson GM, Currie PJ (2010) Cannibalism in Tyrannosaurus rex. PLoS One 5(10):e13419. doi:10.1371/journal.pone.0013419

    PubMed  Article  PubMed Central  Google Scholar 

  52. Lupo KD, O’Connell JF (2002) Cut and tooth mark distributions on large animal bones: ethnoarchaeological data from the Hadza and their implications for current ideas about early human carnivory. J Archaeol Sci 29:85–109

    Article  Google Scholar 

  53. Lyman RL (1994) Vertebrate taphonomy. Cambridge University Press, Cambridge

    Google Scholar 

  54. Mackness B, Sutton R (2000) Possible evidence for intraspecific aggression in a Pliocene crocodile from north Queensland. Alcheringa An Aust J Paleontol 24(1):55–62

    Google Scholar 

  55. Marean CW, Spencer LM (1991) Impact of carnivore ravaging on zooarchaeological measures of element abundance. Am Antiq 56(4):645–658

    Article  Google Scholar 

  56. Mehl MG, Toepelmann WC, Schwartz GM (1916) New or little known reptiles from the Trias of Arizona and New Mexico with notes from the fossil bearing horizons near Wingate, New Mexico. Bull of the Univ of Okla New Ser 103. Univ Stud Ser 5:1–44

    Google Scholar 

  57. Merchant ME, Roche C, Elsey RM, Prudhomme J (2003) Antibacterial properties of serum from the American alligator (Alligator mississippiensis). Comp Biochem Physiol B 136:505–513

    PubMed  Article  Google Scholar 

  58. Merchant ME, Millis K, Leger N, Jerkins E, Vliet KA, McDaniel N (2006) Comparisons of innate immune activity of all known living crocodylian species. Comp Biochem Physiol B 143:133–137

    PubMed  Article  Google Scholar 

  59. Murry PA (1989) Paleoecology and vertebrate faunal relationships of the Upper Triassic Dockum and Chinle formations, southwestern United States. In: Lucas SG, Hunt AP (eds) Dawn of the age of dinosaurs in the American Southwest. New Mexico Museum of Natural History, Albuquerque, pp 375–400

  60. Neill WT (1971) The last of the ruling reptiles: alligators, crocodiles, and their kin. Columbia University Press, New York

    Google Scholar 

  61. Nesbitt SJ (2011) The early evolution of archosaurs: relationships and the origins of major clades. Bull Am Mus Nat Hist 352:1–292

    Article  Google Scholar 

  62. Nesbitt SJ, Stocker MR (2008) The vertebrate assemblage of the Late Triassic Canjilon Quarry (northern New Mexico, USA), and the importance of apomorphy-based assemblage comparisons. J Vertebr Paleontol 28(4):1063–1072

  63. Njau JK, Blumenschine RJ (2006) A diagnosis of crocodile feeding traces on larger mammal bone, with fossil examples from the Plio-Pleistocene Olduvai Basin, Tanzania. J Hum Evol 50(2):142–162

    PubMed  Article  Google Scholar 

  64. Olson EC (1952) The evolution of a Permian vertebrate chronofauna. Evol 6:181–196

    Article  Google Scholar 

  65. Olson EC (1966) Community evolution and the origin of mammals. Ecol 47:291–302

    Article  Google Scholar 

  66. Olson EC (1980) Taphonomy: its history and role in community evolution. In: Behrensmeyer AK, Hill AP (eds) Fossils in the making. Vertebrate Taphonomy and Paleoecology The University of Chicago Press, Chicago, pp 5–19

    Google Scholar 

  67. Parrish JM (1986) Locomotor adaptations in the hindlimb and pelvis of the Thecodontia. Hunteria 1(2):1–33

    Google Scholar 

  68. Parrish JM (1989) Vertebrate paleoecology of the Chinle Formation (Late Triassic) of the southwestern United States. Palaeogeogr Palaeoclimatol Palaeoecol 72:227–247

  69. Parrish JM (1993) Phylogeny of the Crocodylotarsi, with reference to archosaurian and crurotarsan monophyly. J Vertebr Paleontol 13:287–308

    Article  Google Scholar 

  70. Pauwels OSG, Mamonekene V, Dumont P, Branch WR, Burger M, Lavoué S (2003) Diet records for Crocodylus cataphractus (Reptilia: Crocodylidae) at Lake Divangui, Ogooué-Maritime Province, southwestern Gabon. Hamadryad 27:200–204

    Google Scholar 

  71. Ramezani J, Hoke GD, Fastovsky DE, Bowring SA, Therrien F, Dworkin SI, Atchley SC, Nordt LC (2011) High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): temporal constraints on the early evolution of dinosaurs. Geol Soc Am Bull 123:2142–2159

  72. Ramezani J, Fastovsky DE, Bowring SA (2014) Revised chronostratigraphy of the lower Chinle Formation strata in Arizona and New Mexico (USA): high-precision U-Pb geochronological constraints on the Late Triassic evolution of dinosaurs. Am J Sci 214:981–1008

  73. Ritchie EG, Johnson CN (2009) Predator interactions, mesopredator release and biodiversity conservation. Ecol Lett 12:982–998

    PubMed  Article  Google Scholar 

  74. Roopnarine PD (2009) Ecological modeling of paleocommunity food webs. In Dietl GP, Flessa KW (eds) Conservation paleobiology: using the past to manage for the future, paleontological society short course, October 17th, 2009. Paleontol Soc Pap 15:195–220

  75. Roopnarine PD, Angielczyk KD, Wang SC, Hertog R (2007) Trophic network models explain instability of Early Triassic terrestrial communities. Proc R Soc B 274:2077–2086

  76. Selvaggio MM, Wilder J (2001) Identifying the involvement of multiple carnivore taxa with archaeological bone assemblages. J Archaeol Sci 28:465–470

    Article  Google Scholar 

  77. Selvaraj G (2012) Herpetological notes: Tomistoma schlegelii (False Gharial). Diet. Herpetol Rev 43:608–609

    Google Scholar 

  78. Sereno PC, McAllister S, Brusatte SL (2005) TaxonSearch: a relational database for suprageneric taxa and phylogenetic definitions. PhyloInformatics 8:1–21

    Google Scholar 

  79. Shipman P (1986) Scavenging or hunting in early hominids: theoretical framework and tests. Am Anthropol 88(1):27–43

    Article  Google Scholar 

  80. Sidor CA, Vilhena DA, Angielczyk KD, Huttenlocker AK, Nesbitt SJ, Peecook BR, Steyer JS, Smith RMH, Tsuji LA (2013) Provincialization of terrestrial faunas following the end-Permian mass extinction. Proc Natl Acad Sci U S A 110:8129–8133

    PubMed  Article  CAS  PubMed Central  Google Scholar 

  81. Smith ND, Crandall JR, Hellert SM, Hammer WR, Makovicky PJ (2011) Anatomy and affinities of large archosauromorphs from the lower Fremouw Formation (Early Triassic) of Antarctica. J Vertebr Paleontol 31(4):784–797

    Article  Google Scholar 

  82. Sookias RB, Butler RJ, Benson RBJ (2012) Rise of dinosaurs reveals major body-size transitions are driven by passive processes of trait evolution. Proc R Soc B 279:2180–2187

    PubMed  Article  PubMed Central  Google Scholar 

  83. Stock C, Harris JM (1992) Rancho La Brea: a record of Pleistocene life in California, Science Series No. 37. Natural History Museum of Los Angeles County, Los Angeles

    Google Scholar 

  84. Stocker MR (2010) A new taxon of phytosaur (Archosauria: Pseudosuchia) from the Late Triassic (Norian) Sonsela Member (Chinle Formation) in Arizona, and a critical reevaluation of Leptosuchus Case, 1922. Palaeontol 53(5):997–1022

    Article  Google Scholar 

  85. Stocker MR, Butler RJ (2013) Phytosauria. In Nesbitt SJ, Desojo JB, Irmis RB (eds) Anatomy, phylogeny and palaeobiology of early archosaurs and their kin: Geol Soc Lond Spec Publ 379:91–117. http://dx.doi.org/10.1144/SP379.5

  86. Stubbs TL, Pierce SE, Rayfield EJ, Anderson PSL (2013) Morphological and biomechanical disparity of crocodile-line archosaurs following the end-Triassic extinction. Proc R Soc B 280:20131940. doi:10.1098/rspb.2013.1940

    PubMed  Article  PubMed Central  Google Scholar 

  87. Tedford RH (1970) Principles and practices of mammalian geochronology in North America. Proc N Am Paleontol Conv 1969:666–703

    Google Scholar 

  88. Tucker AD, Limpus CJ, McCallum HI, McDonald KR (1996) Ontogenetic dietary partitioning by Crocodylus johnstoni during the dry season. Copeia 1996:978–988

    Article  Google Scholar 

  89. Turner AH, Nesbitt SJ (2013) Body size evolution during the Triassic archosauriform radiation. In Nesbitt SJ, Desojo JB, Irmis RB (eds) Anatomy, phylogeny and palaeobiology of early archosaursand their kin: Geol Soc Lond Spec Publ 379:573–597. doi:10.1144/SP379.15

  90. Vandermark D, Tarduno JA, Brinkman DB (2007) A fossil champsosaur population from the high Arctic: implications for Late Cretaceous paleotemperatures. Palaeogeogr Palaeoclimatol Palaeoecol 248:49–59

  91. Webb G, Manolis C (1988) Australian freshwater crocodiles Crocodylus johnstoni. In: Webb G, Stevenson C (eds) Crocodiles, status survey and conservation action plan, 3rd edn. Darwin, Australia, pp 66–70, Crocodile specialist group

    Google Scholar 

  92. Weinbaum JC (2013) Postcranial skeleton of Postosuchus kirkpatricki (Archosauria: Paracrocodylomorpha), from the Upper Triassic of the United States. In Nesbitt SJ, Desojo JB, Irmis RB (eds) Anatomy, phylogeny and palaeobiology of early archosaurs and their kin: Geol Soc Lond Spec Publ 379:525–553. http://dx.doi.org/10.1144/SP379.7

  93. Whitaker R, Basu D (1983) The gharial (Gavialis gangeticus): a review. J Bombay Nat Hist Soc 79:531–548

    Google Scholar 

  94. Xing L, Bell RP, Currie PJ, Shibata M, Tseng K, Dong Z (2012) A sauropod rib with an embedded theropod tooth: direct evidence for feeding behavior in the Jehol Group, China. Lethaia 45(4):500–506

    Article  Google Scholar 

  95. Zanno LE, Makovicky PJ (2013) Neovenatorid theropods are apex predators in the Late Cretaceous of North America. Nat Commun. doi:10.1038/ncomms3827

  96. Zeigler KE, Geissman JW (2011) Magnetostratigraphy of the Upper Triassic Chinle Group of New Mexico: implications for regional and global correlations among Upper Triassic sequences. Geosphere 7:802–829

    Article  Google Scholar 

  97. Zittel KA (1887–1890) Handbuch der Palaeontologie. 1. Abteilung: Palaeozoologie, 3. Munchen and Leipzig

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Acknowledgments

Financial support for CT scanning was provided to MRS by the Jackson School of Geosciences and the William J. Powers, Jr. Presidential Graduate Fellowship, The University of Texas at Austin. Details related to FMNH PR 1694 were provided by W. Simpson. Information related to GR 264 was confirmed by A. Downs. Initial access to and data on GR 264 at UCMP was provided to SKD by P. Holroyd. Measurement data for some taxa in Table 1 of the Electronic Supplemental Data was provided by J. Desojo and B. Muller. Helpful discussion with C. Sumrall, S. Sheffield, R. Roney, and J. Horton, as well as informative comments from reviewer C. Brown, an anonymous reviewer, and editor S. Thatje, improved the quality of this manuscript.

The research presented in this study complies with all relevant state and federal laws. The authors declare that they have no conflicts of interest.

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Communicated by: Sven Thatje

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Drumheller, S.K., Stocker, M.R. & Nesbitt, S.J. Direct evidence of trophic interactions among apex predators in the Late Triassic of western North America. Naturwissenschaften 101, 975–987 (2014). https://doi.org/10.1007/s00114-014-1238-3

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Keywords

  • Loricata
  • Phytosauria
  • Tooth
  • Computed tomography
  • Apex predator