Perry, S. F. & Sander, M. Reconstructing the evolution of the respiratory apparatus in tetrapods. Resp. Physiol. Neurobiol. 144, 125–139 (2004).
Striedter, G. F. & Northcutt, R. G. Brains Through Time: A Natural History of Vertebrates (Oxford Academic, 2019)
Buchwitz, M., Jansen, M., Renaudie, J., Marchetti, L. & &Voigt, S. Evolutionary change in locomotion close to the origin of amniotes inferred from trackway data in an ancestral state reconstruction approach. Front. Ecol. Evol. 9, 674779 (2021).
Starck, J. M., Stewart, J. R. & Blackbrun, D. G. Phylogeny and evolutionary history of the amniote egg. J. Morphol. 282, 1080–1122 (2021).
Mooney, E. D., Maho, T., Philp, R. P., Bevitt, J. J. & Reisz, R. R. Paleozoic cave system preserves oldest-known evidence of amniote skin. Curr. Biol. 34, 417–426 (2024).
Janis, C. M. & Keller, J. C. Modes of ventilation in early tetrapods: costal aspiration as a key feature of amniotes. Acta Palaeontol. Pol. 46, 137–170 (2001).
Brainerd, E. L. & Owerkowicz, T. Functional morphology and evolution of aspiration breathing in tetrapods. Resp. Physiol. Neurobiol 154, 73–88 (2006).
Vickaryous, M. & Hall, B. K. Homology of the reptile coracoid and a reappraisal of the evolution and development of the amniote pectoral apparatus. J. Anat. 208, 263–285 (2006).
Cieri, R. L., Hatch, S. T., Capano, J. G. & Brainerd, E. L. Locomotor rib kinematics in two species of lizards and a new hypothesis for the evolution of aspiration breathing in amniotes. Sci. Rep. 10, 7739 (2020).
Brainerd, E. L. Gradual evolution of costal aspiration breathing in tetrapods. Anat. Rec. https://doi.org/10.1002/ar.70017 (2025).
Brainerd, E. L., Ditelberg, J. S. & Bramble, D. M. Lung ventilation in salamanders and the evolution of vertebrate air-breathing mechanisms. Biol. J. Linn. Soc. 49, 163–183 (1993).
Holmes, R. The osteology and musculature of the pectoral limb of small captorhinids. J. Morphol. 152, 101–140 (1977).
Romer, A. S. Pectoral limb musculature and shoulder girdle structure in fish and tetrapods. Anat. Record. 27, 119–134 (1924).
Ahlberg, P., Clack, J. & Blom, H. The axial skeleton of the Devonian tetrapod Ichthyostega. Nature 437, 137–140 (2005).
Cieri, R. L. The axial anatomy of monitor lizards (Varanidae). J. Anat. 233, 636–643 (2018).
Reisz R. R. & Maho T. in Oxford Bibliographies in Evolutionary Biology (ed. Whiteman, N.) https://doi.org/10.1093/obo/9780199941728-0149 (Oxford Univ. Press, 2023).
De Jongh, H. J. & Gnas, C. On the mechanism of respiration in the bullfrog, Rana catesbeiana: a reassessment. J. Morphol. 127, 259–290 (1969).
Klein, W., Andrade, D. D., Wang, T. & Taylor, E. W. Effects of temperature and hypercapnia on ventilation and breathing pattern in the lizard Uromastyc aegyptius microlepis. Comp. Biochem. Physiol. 132, 847–859 (2002).
Gans, C. Strategy and sequence in the evolution of external gas exchangers of ectothermal vertebrates. Form Funct. 3, 61–104 (1971).
Brainerd, E. L. in Great Transformations in Vertebrate Evolution (eds Dial, K. P. et al.) 47–62 (Univ. Chicago Press, 2015).
Romer, A. S. Osteology of the Reptiles (Univ. Chicago Press, 1956).
Luo, Z.-X., Ji, Q. & Yuan, C.-X. Convergent dental adaptations in pseudo-tribosphenic and tribosphenic mammals. Nature 450, 93 (2007).
Gaetano, L. C., Mocke, H. & Abdala, F. The postcranial anatomy of Diademodon tetragonus (Cynodontia, Cynognathia). J. Vertebr. Paleontol. 38, e1451872 (2018).
Buchholtz, E., Yozgyur, Z., Feldman, A., Weaver, A. & Gaudin, T. The therian sternum at the lateral somitic frontier: evolution of a composite structure. J. Zool. 315, 19–28 (2020).
Bendel, E. M., Kammerer, C. F., Luo, Z. X., Smith, R. M. & Fröbisch, J. The earliest segmental sternum in a Permian synapsid and its implications for the evolution of mammalian locomotion and ventilation. Sci. Rep. 12, 13472 (2022).
Sidor C. A. & Mann A. The sternum and inter clavicle of Aelurognathus tigriceps (Broom & Haughton, 1913) (Therapsida: Gorgonopsia), with comments on sternal evolution in therapsids. Comptes Rendus Palevol 23, 85–93 (2024).
Brainerd, E. L., Moritz, S. & Ritter, D. A. XROMM analysis of rib kinematics during lung ventilation in the green iguana, Iguana iguana. J. Exp. Biol. 219, 404–411 (2016).
Gunther, A. Contribution to the anatomy of Hatteria (Rhynchocephalus, Owen). Phil. Trans. Rol. Soc. Lond. 167, 595–629 (1867).
Hoffstetter, R. & Gasc, J. P. in Biology of the Reptilia (eds. Gans, C. et al.) 201–310 (Academic, 1969).
Allam, A. A., Daza, J. D. & Abo-Eleneen, R. E. Histology of the skin of three limbless squamates dwelling in mesic and arid environments. Anat. Record 299, 979–989 (2016).
MacDougall, M., Tabor, N., Woodhead, J., Daoust, A. & Reisz, R. R. The unique preservational environment of the Early Permian (Cisuralian) fossiliferous cave deposits of the Richards Spur locality, Oklahoma. Palaeogeogr. Palaeoclimatol. Palaeoecol. 475, 1–11 (2017).
Lee, Y. C. et al. Evidence of preserved collagen in an Early Jurassic sauropodomorph dinosaur revealed by synchrotron FTIR microspectroscopy. Nat. Commun. 8, 14220 (2017).
Scaal, M. Development of the amniote ventrolateral body wall. Dev. Dyn. 250, 39–59 (2020).
Capano, J. G., Moritz, S. & Brainerd, E. L. Three-dimensional analysis of rib kinematics during lung ventilation in the Argentine black and white tegu, Salvator merianae (Reptilia: Teiidae). Anat. Rec. 299, 258 (2016).
Brainerd, E. L., Ritter, D. A., Dawson, M. M. & Sullivan, A. XROMM analysis of rib kinematics and intercostal muscle strain during breathing in Iguana iguana. Integr. Comp. Biol. 50, E15 (2010).
Claessens, L. P. A. M. A cineradiographic study of lung ventilation in Alligator mississipiensis. J. Exp. Zool. 311A, 563–585 (2009).
Schachner E. R., Lyson T. R. & Dodson P. Unearthing the anatomy of dinosaurs: new insights into their functional morphology and paleobiology. Anat. Rec. 292, 1501–1513 (2009).
Zheng, X. et al. Insight into the early evolution of the avian sternum from juvenile enantiornithines. Nat. Commun. 3, 1116 (2012).
Claessens, L. P. A. M. in Great Transformations in Vertebrate Evolution (eds Dial, K. P. et al.) 91–106 (Chicago Univ. Press, 2015).
Jenkins, F. A. Jr & Goslow, G. E. Jr. The functional anatomy of the shoulder of the savannah monitor lizard (Varanus exanthematicus). J. Morphol. 175, 195–216 (1983).
Baier, D. B. & Gatesy, S. M. Three-dimensional skeletal kinematics of the shoulder girdle and forelimb in walking Alligator. J. Anat. 223, 462–473 (2013).
Godfrey, S. J. & Reisz, R. R. The vertebral morphology of Gephyrostegus bohemicus Jaekel 1902, with comments on the atlas-axis complex in primitive tetrapods. Hist. Biol. 5, 27–36 (1991).
Clack, J. A. & Finney, S. M. Pederpes finneyae, an articulated tetrapod from the Tournaisian of Western Scotland. J. Syst. Palaeontol. 2, 311–346 (2005).
Romer, A. S. Osteology of the Reptiles 772 (Univ. Chicago Press, 1956).
LeBlanc, A. R. H. & Reisz, R. R. Patterns of tooth development and replacement in captorhinid reptiles: a comparative approach for understanding the origin of multiple tooth rows. J. Vertebr. Paleontol. 35, e919928 (2015).
Heaton, M. J. & Reisz, R. R. A skeletal reconstruction of the early Permian captorhinid reptile Eocaptorhinus laticeps (Williston). J. Paleontol. 54, 136–143 (1980).
Garbe, U. et al. A new neutron radiography/tomography/imaging station DINGO at OPAL. Phys. Proc. 69, 27–32 (2015).
Mildner, D. F. R., Arif, M. & Stone, C. A. The neutron transmission of single-crystal sapphire filters. J. Appl. Cryst. 26, 438–447 (1993).
Wogelius, R. A. et al. Trace metals as biomarkers for eumelanin pigment in the fossil record. Science 333, 1622–1626 (2011).
Pushie, M. J., Pratt, B. R., Macdonald, T. C., George, G. N. & Pickering, I. J. Evidence for biogenic copper (hemocyanin) in the Middle Cambrian arthropod Marrella from the Burgess Shale. PALAIOS 29, 512–524 (2014).
Mooney, E. D., Scott, D. & Reisz, R. R. A new stem saurian reptile from the late Permian of South Africa and insights into saurian evolution. Swiss J. Palaeontol. 144, 10 (2025).
Robovská-Havelková, P. How can ontogeny help us to understand the morphology of anuran pectoral girdle? Zoomorphology 129, 121–132 (2010).
Wu, Y., Wang, Y. & Hanken, J. Comparative osteology of the genus Pachytriton (Caudata: Salamandridae) from Southeastern China. Asian Herpetol. Res. 3, 83–102 (2012).
Schaunisland, H. Beiträge zur Entwicklungsgeschichte und Anatomie der Wirbeltiere Vol. 39, 1–93 (E. Nägele, 1903).
Torres-Carvajal, O. The abdominal skeleton of Tropidurid lizards (Squamata: Tropiduridae). Herpetologica 60, 75–83 (2004).
Baier, D. B., Garrity, B. M., Moritz, S. & Carney, R. M. Alligator mississippiensis sternal and shoulder girdle mobility increase stride length during high walks. J. Exp. Biol. 221, jeb186791 (2018).
Bradley, A. B. et al. Sternal elements of early dinosaurs fill a critical gap in the evolution of the sternum in Avemetatarsalia (Reptilia: Archosauria). J. Vert. Paleontol. 39, e1700992 (2019).
