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Anderson JS, Reisz RR, Scott D, Fr\u00f6bisch NB, Sumida SS. 2008. A stem batrachian from the Early Permian of Texas and the origin of frogs and salamanders. Nature<\/i> 453: 515\u2013518.","DOI":"10.1038\/nature06865"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Bardua C, Wilkinson M, Gower DJ, Sherratt E, Goswami A. 2019. Morphological evolution and modularity of the caecilian skull. BMC Evol Biol<\/i> 19: 30.","DOI":"10.1186\/s12862-018-1342-7"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Bemis WE, Schwenk K, Wake MH. 1983. Morphology and function of the feeding apparatus in Dermophis mexicanus<\/i> (Amphibia: Gymnophiona). Zool J Linn Soc<\/i> 77: 75\u201396.","DOI":"10.1111\/j.1096-3642.1983.tb01722.x"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Capano JG. 2020. Reaction forces and rib function during locomotion in snakes. Integr Comp Biol<\/i> 60: 215\u2013231.","DOI":"10.1093\/icb\/icaa033"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Carroll RL. 2007. The palaeozoic ancestry of salamanders, frogs and caecilians. Zool J Linn Soc<\/i> 150: 1\u2013140.","DOI":"10.1111\/j.1096-3642.2007.00246.x"},{"key":"6","unstructured":"6. Christine JA. 2016. An overview of caecilians (Lissamphibia: Gymnophiona), with emphasis on selected topics. Research<\/i>."},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Chugh M, Munjal A, Megason SG. 2022. Hydrostatic pressure as a driver of cell and tissue morphogenesis. Semin Cell Dev Biol<\/i> 131: 134\u2013145.","DOI":"10.1016\/j.semcdb.2022.04.021"},{"key":"8","unstructured":"8. Ducey PK, Formanowicz DR Jr, Boyet L, Mailloux J, Nussbaum RA. 1993. Experimental examination of burrowing behavior in caecilians (Amphibia: Gymnophiona): Effects of soil compaction on burrowing ability of four species. Herpetologica<\/i> 49: 450\u2013457."},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Gans C. 1962. Terrestrial locomotion without limbs. Am Zool<\/i> 2: 167\u2013182.","DOI":"10.1093\/icb\/2.2.167"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Gans C. 1973. Locomotion and burrowing in limbless vertebrates. Nature<\/i> 242: 414\u2013415.","DOI":"10.1038\/242414a0"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Gans C. 1975. Tetrapod limblessness: Evolution and functional corollaries. Am Zool<\/i> 15: 455\u2013467.","DOI":"10.1093\/icb\/15.2.455"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Gans C, Dessauer HC, Baic D. 1978. Axial differences in the musculature of uropeltid snakes: the freight-train approach to burrowing. Science<\/i> 199: 189\u2013192.","DOI":"10.1126\/science.199.4325.189"},{"key":"13","unstructured":"13. Gans C. 1994. Approaches to the evolution of limbless locomotion. Cuad Herpetol<\/i> 8: 12\u201317."},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Gaymer R. 1971. New method of locomotion in limbless terrestrial vertebrates. Nature<\/i> 234: 150\u2013151.","DOI":"10.1038\/234150a0"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Gomes AD, Moreira RG, Navas CA, Antoniazzi MM, Jared C. 2012. Review of the reproductive biology of caecilians (Amphibia, Gymnophiona). South Am J Herpetol<\/i> 7: 191\u2013202.","DOI":"10.2994\/057.007.0301"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Herrel A, Measey GJ. 2010. The kinematics of locomotion in caecilians: effects of substrate and body shape. J Exp Zool Part A Ecol Genet Physiol<\/i> 313: 301\u2013309.","DOI":"10.1002\/jez.599"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Herrel A, Measey GJ. 2012. Feeding underground: kinematics of feeding in caecilians. J Exp Zool Part A Ecol Genet Physiol<\/i> 317: 533\u2013539.","DOI":"10.1002\/jez.1745"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Hohl LSL, Loguercio MFC, Buend\u00eda RA, Almeida-Santos M, Viana LA, Barros-Filho JD, Rocha-Barbosa O. 2014. Fossorial gait patterns and performance of a shovel-headed amphisbaenian. J Zool (Lond)<\/i> 294: 234\u2013240.","DOI":"10.1111\/jzo.12173"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Jared C, Navas CA, Toledo RC. 1999. An appreciation of the physiology and morphology of the caecilians (Amphibia: Gymnophiona). Comp Biochem Physiol<\/i> 123: 313\u2013328.","DOI":"10.1016\/S1095-6433(99)00076-8"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Jayne BC. 1988. Muscular mechanisms of snake locomotion: an electromyographic study of lateral undulation and concertina modes of terrestrial locomotion in the snake Coluber constrictor. J Exp Biol<\/i> 140: 1\u201333.","DOI":"10.1242\/jeb.140.1.1"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Jayne BC. 2020. What defines different modes of snake locomotion? Integr Comp Biol<\/i> 60: 156\u2013170.","DOI":"10.1093\/icb\/icaa017"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Kier WM, Smith KK. 1985. Tongues, tentacles, and trunks: the biomechanics of movement in muscular hydrostats. Zool J Linn Soc<\/i> 83: 307\u2013324.","DOI":"10.1111\/j.1096-3642.1985.tb01178.x"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Kleinteich T, Haas A. 2007. Cranial musculature in the larva of the caecilian, Ichthyophis kohtaoensis<\/i> (Lissamphibia: Gymnophiona). J Morphol<\/i> 268: 74\u201388.","DOI":"10.1002\/jmor.10503"},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Kleinteich T, Maddin HC, Herzen J, Beckmann F, Summers AP. 2012. Is solid always best? Cranial performance in solid and fenestrated caecilian skulls. J Exp Biol<\/i> 215: 833\u2013844.","DOI":"10.1242\/jeb.065979"},{"key":"25","doi-asserted-by":"crossref","unstructured":"25. Kligman BT, Gee BM, Marsh AD, Nesbitt SJ, Smith ME, Parker WG, Stocker MR. 2023. Triassic stem caecilian supports dissorophoid origin of living amphibians. Nature<\/i> 614: 102\u2013107.","DOI":"10.1038\/s41586-022-05646-5"},{"key":"26","doi-asserted-by":"crossref","unstructured":"26. Kurth JA, Kier WM. 2014. Scaling of the hydrostatic skeleton in the earthworm Lumbricus terrestris. J Exp Biol<\/i> 217: 1860\u20131867.","DOI":"10.1242\/jeb.098137"},{"key":"27","doi-asserted-by":"crossref","unstructured":"27. Liedtke HC, Wiens JJ, Gomez-Mestre I. 2022. The evolution of reproductive modes and life cycles in amphibians. Nat Commun<\/i> 13: 7039.","DOI":"10.1038\/s41467-022-34474-4"},{"key":"28","doi-asserted-by":"crossref","unstructured":"28. Lowie A, De Kegel B, Wilkinson M, Measey J, O\u2019Reilly JC, Kley NJ, Gaucher P, Brecko J, Kleinteich T, Herrel A, Adriaens D. 2022c. Regional differences in vertebral shape along the axial skeleton in caecilians (Amphibia: Gymnophiona). J Anat<\/i> 241: 716\u2013728.","DOI":"10.1111\/joa.13682"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29. Lowie A, De Kegel B, Wilkinson M, Measey J, O\u2019Reilly JC, Kley NJ, Gaucher P, Brecko J, Kleinteich T, Adriaens D, Herrel A. 2022a. Is vertebral shape variability in caecilians (Amphibia: Gymnophiona) constrained by forces experienced during burrowing? J Exp Biol<\/i> 225: jeb244288.","DOI":"10.1242\/jeb.244288"},{"key":"30","doi-asserted-by":"crossref","unstructured":"30. Lowie A, De Kegel B, Wilkinson M, Measey J, O\u2019Reilly JC, Kley NJ, Gaucher P, Brecko J, Kleinteich T, Adriaens D, Herrel A. 2022b. The relationship between head shape, head musculature and bite force in caecilians (Amphibia: Gymnophiona). J Exp Biol<\/i> 225: jeb243599.","DOI":"10.1242\/jeb.243599"},{"key":"31","doi-asserted-by":"crossref","unstructured":"31. Maddin HC, Russell AP, Anderson JS. 2012. Phylogenetic implications of the morphology of the braincase of caecilian amphibians (Gymnophiona). Zool J Linn Soc<\/i> 166: 160\u2013201.","DOI":"10.1111\/j.1096-3642.2012.00838.x"},{"key":"32","unstructured":"32. Moore KL, Dalley AF, Agur AMR. 2018. Clinically Oriented Anatomy, 8th ed., Wolters Kluwer, Philadelphia."},{"key":"33","unstructured":"33. National research council (NRC). 2011. Guide for the Care and Use of Laboratory Animals, 8th Edition, The National Academes Press, Washington, D.C."},{"key":"34","doi-asserted-by":"crossref","unstructured":"34. Naylor BG, Nussbaum RA. 1980. The trunk musculature of caecilians (Amphibia: Gymnophiona). J Morphol<\/i> 166: 259\u2013273.","DOI":"10.1002\/jmor.1051660302"},{"key":"35","doi-asserted-by":"crossref","unstructured":"35. Nussbaum RA, Naylor BG. 1982. Variation in the trunk musculature of caecilians (Amphibia: Gymnophiona). J Zool<\/i> 198: 383\u2013398.","DOI":"10.1111\/j.1469-7998.1982.tb02083.x"},{"key":"36","doi-asserted-by":"crossref","unstructured":"36. O\u2019Reilly JC, Ritter DA, Carrier DR. 1997. Hydrostatic locomotion in a limbless tetrapod. Nature<\/i> 386: 269\u2013272.","DOI":"10.1038\/386269a0"},{"key":"37","doi-asserted-by":"crossref","unstructured":"37. O\u2019 Reilly JC, Summers AP, Ritter DA. 2000. The evolution of the functional role of trunk muscles during locomotion in adult amphibians. Am Zool<\/i> 40: 123\u2013135.","DOI":"10.1093\/icb\/40.1.123"},{"key":"38","doi-asserted-by":"crossref","unstructured":"38. Renous S, Gasc JP. 1989. Body and vertebral proportions in Gymnophiona (Amphibia): Diversity of morphological types. Copeia<\/i> 1989: 837\u2013847.","DOI":"10.2307\/1445966"},{"key":"39","doi-asserted-by":"crossref","unstructured":"39. Santos RO, Laurin M, Zaher H. 2020. A review of the fossil record of caecilians (Lissamphibia: Gymnophionomorpha) with comments on its use to calibrate molecular timetrees. Biol J Linn Soc Lond<\/i> 131: 737\u2013755.","DOI":"10.1093\/biolinnean\/blaa148"},{"key":"40","doi-asserted-by":"crossref","unstructured":"40. Sherratt E, Gower DJ, Klingenberg CP, Wilkinson M. 2014. Evolution of cranial shape in caecilians (Amphibia: Gymnophiona). Evol Biol<\/i> 41: 528\u2013545.","DOI":"10.1007\/s11692-014-9287-2"},{"key":"41","doi-asserted-by":"crossref","unstructured":"41. Siebert T, Till O, Blickhan R. 2014a. Work partitioning of transversally loaded muscle: experimentation and simulation. Comput Methods Biomech Biomed Engin<\/i> 17: 217\u2013229.","DOI":"10.1080\/10255842.2012.675056"},{"key":"42","doi-asserted-by":"crossref","unstructured":"42. Siebert T, Till O, Stutzig N, G\u00fcnther M, Blickhan R. 2014b. Muscle force depends on the amount of transversal muscle loading. J Biomech<\/i> 47: 1822\u20131828.","DOI":"10.1016\/j.jbiomech.2014.03.029"},{"key":"43","doi-asserted-by":"crossref","unstructured":"43. Sleboda DA, Roberts TJ. 2020. Internal fluid pressure influences muscle contractile force. Proc Natl Acad Sci USA<\/i> 117: 1772\u20131778.","DOI":"10.1073\/pnas.1914433117"},{"key":"44","doi-asserted-by":"crossref","unstructured":"44. Summers AP, O\u2019Reilly JC. 1997. A comparative study of locomotion in the caecilians, Dermophis mexicanus<\/i> and Typhlonectes natans<\/i> (Amphibia: Gymnophiona). Zool J Linn Soc<\/i> 121: 65\u201376.","DOI":"10.1111\/j.1096-3642.1997.tb00147.x"},{"key":"45","doi-asserted-by":"crossref","unstructured":"45. Torres-S\u00e1nchez M, Gower DJ, Alvarez-Ponce D, Creevey CJ, Wilkinson M, San Mauro D. 2019. What lies beneath? Molecular evolution during the radiation of caecilian amphibians. BMC Genomics<\/i> 20: 354.","DOI":"10.1186\/s12864-019-5694-1"},{"key":"46","unstructured":"46. Wake MH. 1980. Reproduction, growth, and population structure of the Central American caecilian, Dermophis mexicanus<\/i>. Herpetologica<\/i> 36: 244\u2013256."},{"key":"47","doi-asserted-by":"crossref","unstructured":"47. Wake MH. 1980a. Morphometrics of the skeleton of Dermophis mexicanus (Amphibia: Gymnophiona). Part I. The vertebrae, with comparisons to other species. J Morphol<\/i> 165: 117\u2013130.","DOI":"10.1002\/jmor.1051650202"},{"key":"48","unstructured":"48. Wake MH, Wake D. 2000b. Developmental morphology of early vertebrogenesis in caecilians (Amphibia: Gymnophiona): Resegmentation and phylogenesis. Zoology (Jena)<\/i> 103: 68\u201388."},{"key":"49","doi-asserted-by":"crossref","unstructured":"49. Wilkinson M, Nussbaum RA. 1998. Caecilian viviparity and amniote origins. J Nat Hist<\/i> 32: 1403\u20131409.","DOI":"10.1080\/00222939800770701"},{"key":"50","doi-asserted-by":"crossref","unstructured":"50. Zhang P, Zhou H, Chen YQ, Liu YF, Qu LH. 2005. Mitogenomic perspectives on the origin and phylogeny of living amphibians. 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