39. Leakey LSB (1965) Non-mammalian fauna. In: Leakey LSB, ed. Olduvai Gorge 1951–61, Volume 1: A Preliminary Report on the Geology and Fauna. Cambridge: Cambridge University Press. pp 70–72. 40. Brochu CA (2003) Phylogenetic approaches toward crocodylian history. Annual Review of Earth and Planetary Sciences 31: 357–397. 41. Blumenschine RJ, Peters CR, Masao FT, Clarke RJ, Deino AL, et al. (2003) Late Pliocene Homo and hominid land use from western Olduvai Gorge, Tanzania. Science 299: 1217–1221. 42. Ka¨lin JA (1933) Beitra¨ge zur vergleichenden Osteologie des Crocodilidenscha¨- dels. Zoologische Jahrbu¨ cher 57: 535–714. 43. Wermuth H (1953) Systematik der rezenten Krokodile. Mitteilungen der Zoologisches Museum Berlin 29: 376–514. 44. Goloboff PA, Farris JS, Nixon KC (2008) T.N.T.: Tree Analysis Using New Technology. 1.1 ed: Willi Hennig Society. 45. Swofford DL (2002) PAUP*. Phylogenetic Analysis Using Parsimony (*and Other Methods), version 4.0b10. 4 ed. Sunderland, MA: Sinauer Associates. 46. Delfino M, Rook L (2008) African crocodylians in the Late Neogene of Europe: a revision of Crocodylus bambolii Ristori, 1890. Journal of Paleontology 82: 336–343. 47. Owen R (1850) On the communications between the cavity of the tympanum and the palate in the Crocodilia (gavials, alligator and crocodiles). Philosophical Transactions of the Royal Society of London 27: 521–527. 48. Colbert EH (1946) The eustachian tubes in the Crocodilia. Copeia 1946: 11–14. 49. Witmer LM (1995) The Extant Phylogenetic Bracket and the importance of reconstructing soft tissues in fossils. In: Thomason JJ, ed. Functional Morphology in Vertebrate Paleontology. New York: Cambridge University Press. pp 19–33. 50. Maccagno AM (1952) I crocodrillo di Sahabi. Rendiconti Accademia Nazionale dei XL, ser 4 3: 73–119. 51. Ristori G (1890) Sopra i resti di un coccodrillo scoperti nelle ligniti Mioceniche di Montebamboli. Rendiconti Istituto di Studi Superiori Pratici e di Perfezio- namento in Firenze. pp 1–34. 52. Delfino M, Bo¨ hme M, Rook L (2007) First European evidence for transcontinental dispersal of Crocodylus (late Neogene of southern Italy). Zoological Journal of the Linnean Society 149: 293–307. 53. Harrison T, Baker E (1997) Paleontology and biochronology of fossil localities in the Manonga Valley, Tanzania. In: Harrison T, ed. Neogene Paleontology of the Manonga Valley, Tanzania. New York: Plenum Press. pp 361–393. 54. Rauhe M, Frey E, Pemberton DS, Rossmann T (1999) Fossil crocodilians from the Late Miocene Baynunah Formation of the Emirate of Abu Dhabi, United Arab Emirates: Osteology and palaeoecology. In: Whybrow PJ, Hill A, eds. Fossil Vertebrates of Arabia. New Haven, CT: Yale University Press. pp 163–185. 55. Fourtau R (1920) Contribution a` l’etude des vertebres mioce`nes de l’Egypte. Cairo: Egypt Survey Department. 121 p. 56. Brazaitis P (1973) The identification of living crocodilians. Zoologica 59: 59–88. 57. Mu¨ ller L (1923) Crocodilus siamensis Schneid. und Crocodilus ossifragus Dubois. Palaeontologia Hungarica 1: 109–114. 58. Brazaitis P (1973) The identification of Crocodilus siamensis Schneider. Zoologica 59: 43–45. 59. Barbour T (1918) Amphibia and Reptilia. Bulletin of the Museum of Comparative Zoology 14: 479–489. 60. Mook CC (1921) Description of a skull of the extinct Madagascar Crocodile, Crocodilus robustus Vaillant and Grandidier. Bulletin of the American Museum of Natural History 44: 25–33. Extinct Horned Crocodile 61. Bickelmann C, Klein N (2009) The late Pleistocene horned crocodile Voay robustus (Grandidier & Vaillant, 1872) from Madagascar in the Museum fu¨ r Naturkunde Berlin. Fossil Record 12: 13–21. 62. Brochu CA, Njau JK, Blumenschine RJ, Densmore LD (2008) Giant horned crocodiles from the late Cenozoic of Africa: stealth diversity revisited. Journal of Vertebrate Paleontology 27: 57A. 63. Swinton WE (1926) The geology and palaeontology of the Kaiso Bone-Beds: Fossil Reptilia. Uganda Protectorate Geological Survey Department Occasional Paper 2: 37–44. 64. Bell CJ, Gauthier JA, Bever GS (in press) Covert biases, circularity, and apomorphies: a critical look at the North American Quaternary Herpetofaunal Stability Hypothesis. Quaternary International. 65. Nesbitt SJ, Stocker M (2008) The vertebrate assemblage of the Late Triassic Canjilon Quarry (northern New Mexico, USA), and the importance of apomorphy-based assemblage comparisons. Journal of Vertebrate Paleontology 28: 1063–1072. 66. Hekkala ER, Amato G, DeSalle R, Blum MJ (in press) Molecular assessment of population differentiation and individual assignment potential of Nile crocodile (Crocodylus niloticus) populations. Conservation Genetics. 67. Fuchs K, Mertens R, Wermuth H (1974) Die Unterarten des Nilkrokodils, Crocodylus niloticus. Salamandra 10: 107–114. 68. 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. Journal of Human Evolution 50: 102–122. 69. Tobias PV (1991) Olduvai Gorge: The Skulls, Endocasts, and Teeth of Homo habilis. Cambridge: Cambridge University Press. 70. Susman RL, Stern JT (1982) Functional morphology of Homo habilis. Science 217: 931–934. 71. Blumenschine RJ, Stanistreet IG, Njau JK, Bamford MK, Masao FT, et al. (in review) Environments and hominin activities across the FLK Peninsula during Zinjanthropus times (1.84 Ma), Olduvai Gorge, Tanzania. 72. Schrenk F, Bromage TG, Gorthner A, Sandrock O (1995) Paleoecology of the Malawi Rift: vertebrate and invertebrate faunal contexts of the Chiwondo Beds, northern Malawi. Journal of Human Evolution 28: 59–70. 73. Joordens JCA, Wesselingh FP, de Vos J, Vonhof HB, Kroon D (2009) Relevance of aquatic environments for hominins: a case study from Trinil (Java, Indonesia). Journal of Human Evolution 57: 656–671. 74. Prat S, Brugal J-P, Tiercelin J-J, Barrat J-A, Bohn M, et al. (2005) First occurrence of early Homo in the Nachukui Formation (West Turkana, Kenya) at 2.3–2.4 Myr. Journal of Human Evolution 49: 230–240. 75. Ghinassi M, Libsekal Y, Papini M, Rook L (2009) Palaeoenvironments of the Buia Homo site: high-resolution facies analysis and non-marine sequence stratigraphy in the Alat Formation (Pleistocene Dandiero Basin, Danakil Depression, Eritrea). Palaeogeography, Palaeoclimatology, Palaeoecology 280. 76. Delfino M, Segid A, Yosief D, Shoshani J, Rook L, et al. (2004) Fossil reptiles from the Pleistocene Homo-bearing locality of Buia (Eritrea, northern Danakil Depression). Revista Italiana di Paleontologia e Stratigrafia 110: 51–60. 77. Vignaud P, Duringer P, Mackaye HT, Likius A, Blondel C, et al. (2002) Geology and palaeontology of the Upper Miocene Toros-Menalla hominid locality, Chad. Nature 418: 152–155. 78. Peters CR, Blumenschine RJ (1995) Landscape perspectives on possible land use patterns for Early Pleistocene hominids in the Olduvai Basin, Tanzania. Journal of Human Evolution 29: 321–362. PLoS ONE | www.plosone.org 13 February 2010 | Volume 5 | Issue 2 | e9333