Geometric morphometrics in herpetology: modern tools for enhancing the study of morphological variation in amphibians and reptiles

Antigoni Kaliontzopoulou 

 CIBIO/UP, Centro de Investigação em Biodiversidade e Recursos Genéticos, Campus Agrario de Vairão, 4485-661 Vairão, Portugal. antigoni@mail.icav.up.pt

http://dx.doi.org/10.11160/bah.11016                                                                                Full text (PDF) 

· Adams, D.C. (2004). Character displacement via aggressive interference in Appalachian salamanders. Ecology 85: 2664-2670. CrossRef

· Adams, D.C. (2010). Parallel evolution of character displacement driven by competitive selection in terrestrial salamanders. BMC Evolutionary Biology 10: 72.CrossRef

· Adams, D.C. (2011). Quantitative genetics and evolution of head shape in Plethodon salamanders. Evolutionary Biology 38: 278-286. CrossRef

· Adams, D.C. & Collyer, M.L. (2009). A general framework for the analysis of phenotypic trajectories in evolutionary studies. Evolution 63: 1143-1154. CrossRef

· Adams, D.C. & Nistri, A. (2010). Ontogenetic convergence and evolution of foot morphology in European cave salamanders (Family: Plethodontidae). BMC Evolutionary Biology 10: 216. CrossRef

· Adams, D.C. & Rohlf, F.J. (2000). Ecological character displacement in Plethodon: Biomechanical differences found from a geometric morphometric study.Proceedings of the National Academy of Sciences USA 97: 4106-4111. CrossRef

· Adams, D.C. & Rosenberg, M.S. (1998). Partial warps, phylogeny, and ontogeny: a comment on Fink and Zelditch (1995). Systematic Biology 47: 168-173.CrossRef

· Adams, D.C.; Rohlf, F.J. & Slice, D.E. (2004). Geometric morphometrics: ten years of progress following the ‘revolution’. Italian Journal of Zoology 71: 5-16.CrossRef

· Adams, D.C.; West, M.E. & Collyer, M.L. (2007). Location-specific sympatric morphological divergence as a possible response to species interactions in West Virginia Plethodon salamander communities. Journal of Animal Ecology 76: 289-295. CrossRef

· Adams, D.C.; Cardini, A.; Monteiro, L.R.; O’Higgins, P. & Rohlf, F.J. (2011). Morphometrics and phylogenetics: principal components of shape from cranial modules are neither appropriate nor effective cladistic characters. Journal of Human Evolution 60: 240-243. CrossRef

· Angielczyk, K.D.; Feldman, C.R. & Miller, G.R. (2011). Adaptive evolution of plastron shape in emydine turtles. Evolution 65: 377-394. CrossRef 

· Arendt, J. (2010). Morphological correlates of sprint swimming speed in five species of spadefoot toad tadpoles: Comparison of morphometric methods. Journal of Morphology 271: 1044-1052. CrossRef 

· Arif, S.; Adams, D.C. & Wicknick, J.A. (2007). Bioclimatic modelling, morphology, and behaviour reveal alternative mechanisms regulating the distributions of two parapatric salamander species. Evolutionary Ecology Research 9: 843-854. CrossRef 

· Ashlock, D.; Adams, D.C. & Doty, D. (2003). Morphometric grayscale texture analysis using foot patterns. Proceedings of the 2003 Congress on Evolutionary Computation: 1575-1582.

· Băncilǎ, R.; Van Gelder, I.; Rotteveel, E.; Loman, J. & Arntzen, J.W. (2010). Fluctuating asymmetry is a function of population isolation in island lizards. Journal of Zoology 282: 266-275. CrossRef 

· Barden, H.E. & Maidment, S.C.R. (2011). Evidence for sexual dimorphism in the stegosaurian dinosaur Kentrosaurus aethiopicus from the Upper Jurassic of Tanzania. Journal of Vertebrate Paleontology 31: 641-651. CrossRef 

· Baszio, S. & Weber, S. (2002). Potentials and limits of morphometry in the understanding of squamate osteological structures. Senckenbergiana lethaea 82: 13-22.

· Bonnan, M.F.; Farlow, J.O. & Masters, S.L. (2008). Using linear and geometric morphometrics to detect intraspecific variability and sexual dimorphism in femoral shape in Alligator mississippiensis and its implications for sexing fossil archosaurs. Journal of Vertebrate Paleontology 28: 422-431. CrossRef

· Bonnan, M.F.; Sandrik, J.L.; Nishiwaki, T.; Wilhite, D.R.; Elsey, R.M. & Vittore, C. (2010). Calcified cartilage shape in archosaur long bones reflects overlying joint shape in stress-bearing elements: Implications for nonavian dinosaur locomotion. The Anatomical Record 293: 2044-2055. CrossRef 

· Bookstein, F.L. (1986). Size and shape spaces for landmark data in two dimensions. Statistical Science 1: 181-222. CrossRef

· Bookstein, F.L. (1989a). “Size and shape”: a comment on semantics. Systematic Zoology 38: 173-180. CrossRef

· Bookstein, F.L. (1989b). Principal warps: thin-plate splines and the decomposition of deformations. IEEE Transactions on Pattern Analysis and Machine Intelligence 11: 567-585. CrossRef

· Bookstein, F.L. (1991). Morphometric Tools for Landmark Data: Geometry and Biology. Cambridge University Press, Cambridge, United Kingdom.

· Bookstein, F.L. (1994). Can biometrical shape be a homologous character?, In B.K. Hall (ed.) Homology: The Hierarchical Basis of Comparative Biology. Academic Press, New York, pp. 197-227.

· Bookstein, F.L. (1996). Biometrics, biomathematics and the morphometric synthesis. Bulletin of Mathematical Biology 58: 313-365. CrossRef

· Bookstein, F.L. (1997). Landmark methods for forms without landmarks: localizing group differences in outline shape. Medical Image Analysis 1: 225-243.CrossRef

· Bruner, E. & Costantini, D. (2007). Head morphological variation in Podarcis muralis and Podarcis sicula: a landmark-based approach. Amphibia-Reptilia 28: 566-573. CrossRef

· Bruner, E.; Costantini, D.; Fanfani, A. & Dell’Omo, G. (2005). Morphological variation and sexual dimorphism of the cephalic scales in Lacerta bilineata. Acta Zoologica 86: 245-254. CrossRef

· Burke, A.C. (1989). Development of the turtle carapace: implications for the evolution of a novel Bauplan. Journal of Morphology 199: 363-378. CrossRef

· Candioti, M.F.V. (2006). Ecomorphological guilds in anuran larvae: an application of geometric morphometric methods. Herpetological Journal 16: 149-162.

· Candioti, M.F.V. (2008). Larval anatomy of Andean tadpoles of Telmatobius (Anura: Ceratophryidae) from Northwestern Argentina. Zootaxa 1938: 40-60.

· Canudo, J.I. & Cuenca-Bescós, G. (2004). Morphometric approach to Titanosauriformes (Sauropoda, Dinosauria) femora: implications to the paleobiogeographic analysis, In A.M.T. Elewa (ed.) Morphometrics: Applications in Biology and Paleontology. Springer-Verlag, Berlin, pp. 143-156.

· Ceballos, C.P. & Valenzuela, N. (2011). The role of sex-specific plasticity in shaping sexual dimorphism in a long-lived vertebrate, the snapping turtle Chelydra serpentina. Evolutionary Biology 38: 163-181. CrossRef

· Chiari, Y. & Claude, J. (2011). Study of the carapace shape and growth in two Galápagos tortoise lineages. Journal of Morphology 272: 379-386. CrossRef

· Claude, J. (2008). Morphometrics with R. Springer, New York.

· Claude, J.; Paradis, E.; Tong, H. & Auffray, J.-C. (2003). A geometric morphometric assessment of the effects of environment and cladogenesis on the evolution of the turtle shell. Biological Journal of the Linnean Society 79: 485-501. CrossRef

· Claude, J.; Pritchard, P..C.H.; Tong, H.; Paradis, E. & Auffray, J.-C. (2004). Ecological correlates and evolutionary divergence in the skull of turtles: a geometric morphometric assessment. Systematic Biology 53: 933-948. CrossRef

· Clemente-Carvalho, R.B.G.; Monteiro, L.R.; Bonato, V.; Rocha, H.S.; Pereira, G.R.; Oliveira, D.F.; Lopes, R.T.; Haddad, C.F.B.; Martins, E.G. & dos Reis, S.F. (2008). Geographic variation in cranial shape in the pumpkin toadlet (Brachycephalus ephippium): a geometric analysis. Journal of Herpetology 42: 176-185.CrossRef

· Clemente-Carvalho, R.B.G.; Alves, A.C.R.; Perez, S.I.; Haddad, C.F.B. & dos Reis, S.F. (2011). Morphological and molecular variation in the pumpkin toadlet,Brachycephalus ephippium (Anura: Brachycephalidae). Journal of Herpetology 45: 94-99. CrossRef

· Collyer, M.L. & Adams, D.C. (2007). Analysis of two-state multivariate phenotypic change in ecological studies. Ecology 88: 683-692. CrossRef

· Costa, C.; Angelini, C.; Scardi, M.; Menesatti, P. & Utzeri, C. (2009). Using image analysis on the ventral colour pattern in Salamandrina perspicillata (Amphibia: Salamandridae) to discriminate among populations. Biological Journal of the Linnean Society 96: 35-43. CrossRef

· Costantini, D.; Bruner, E.; Fanfani, A. & Dell’Omo, G. (2007). Male-biased predation of western green lizards by Eurasian kestrels. Naturwissenschaften 94: 1015-1020. CrossRef

· Daza, J.D.; Herrera, A.; Thomas, R. & Claudio, H.J. (2009). Are you what you eat? A geometric morphometric analysis of gekkotan skull shape. Biological Journal of the Linnean Society 97: 677-707. CrossRef

· Depecker, M.; Berge, C.; Penin, X. & Renous, S. (2006). Geometric morphometrics of the shoulder girdle in extant turtles (Chelonii). Journal of Anatomy 208: 35-45. CrossRef

· Dryden, I.L. & Mardia, K.V. (1998). Statistical Shape Analysis. John Wiley & Sons, Chichester, United Kingdom.

· Elewa, A.M.T. (2004). Introduction, In A.M.T. Elewa (ed.) Morphometrics: Applications in Biology and Paleontology. Springer-Verlag, Berlin, pp. 1-6.

· Emerson, S.B. & Bramble, D.M. (1993). Scaling, allometry, and skull design, In J. Hanken & B.K. Hall (eds.) The Skull. Volume 3. Functional and Evolutionary Mechanisms. University of Chicago Press, Chicago, pp. 384-421.

· Ferson, S.; Rohlf, F.J. & Koehn, R.K. (1985). Measuring shape variation of two-dimensional outlines. Systematic Zoology 34: 59-68. CrossRef

· Garriga, N. & Llorente, G.A. (in press). Chondrocranial ontogeny of Pelodytes punctatus (Anura: Pelodytidae). Response to competition: geometric morphometric and allometric change analysis. Acta Zoologica doi: 10.1111/j.1463-6395.2011.00520.x. CrossRef

· Gentilli, A.; Cardini, A.; Fontaneto, D. & Zuffi, M.A.L. (2009). The phylogenetic signal in cranial morphology of Vipera aspis: a contribution from geometric morphometrics. Herpetological Journal 19: 69-77.

· Gosner, K.L. (1960). A simplified table for staging anuran embryos and larvae with notes on identification. Herpetologica 16: 183-190.

· Gould, S.J. (1966). Allometry and size in ontogeny and phylogeny. Biological Reviews 41: 587-640. CrossRef

· Harmon, L.J.; Kolbe, J.J.; Cheverud, J.M. & Losos, J.B. (2005). Convergence and the multidimensional niche. Evolution 59: 409-421. CrossRef

· Head, J.J.; Bloch, J.I.; Hastings, A.K.; Bourque, J.R.; Cadena, E.A.; Herrera, F.A.; Polly, P.D. & Jaramillo, C.A. (2009). Giant boid snake from the Palaeocene neotropics reveals hotter past equatorial temperatures. Nature 457: 715-717. CrossRef

· Herrel, A.; McBrayer, L.D. & Larson, P.M. (2007). Functional basis for sexual differences in bite force in the lizard Anolis carolinensis. Biological Journal of the Linnean Society 91: 111-119. CrossRef

· Hossie, T.J.; Ferland-Raymond, B.; Burness, G. & Murray, D.L. (2010). Morphological and behavioural responses of frog tadpoles to perceived predation risk: A possible role for corticosterone mediation? Ecoscience 17: 100-108. CrossRef

· Huyghe, K.; Herrel, A.; Adriaens, D.; Tadić, Z. & Van Damme, R. (2009). It is all in the head: morphological basis for differences in bite force among colour morphs of the Dalmatian wall lizard. Biological Journal of the Linnean Society 96: 13-22. CrossRef

· Ivanović, A.; Vukov, T.D.; Džukić, G.; Tomašević, N. & Kalezić, M.L. (2007). Ontogeny of skull size and shape changes within a framework of biphasic lifestyle: a case study in six Triturus species (Amphibia, Salamandridae). Zoomorphology 126: 173-183. CrossRef

· Ivanović, A.; Sotiropoulos, K.; Vukov, T.D.; Eleftherakos, K.; Džukić, G.; Polymeni, R.M. & Kalezić, M.L. (2008). Cranial shape variation and molecular phylogenetic structure of crested newts (Triturus cristatus superspecies: Caudata, Salamandridae) in the Balkans. Biological Journal of the Linnean Society 95: 348-360. CrossRef

· Ivanović, A.; Sotiropoulos, K.; Džukić, G. & Kalezić, M.L. (2009). Skull size and shape variation versus molecular phylogeny: a case study of alpine newts (Mesotriton alpestris, Salamandridae) from the Balkan Peninsula. Zoomorphology 128: 157-167. CrossRef

· Ivanović, A.; Cvijanović, M. & Kalezić, M.L. (2011). Ontogeny of body form and metamorphosis: insights from the crested newts. Journal of Zoology 283: 153-161.CrossRef 

· Jaekel, M. & Wake, D.B. (2007). Developmental processes underlying the evolution of a derived foot morphology in salamanders. Proceedings of the National Academy of Sciences USA 104: 20437-20442. CrossRef

· Jamniczky, H.A. & Russell, A.P. (2004). A geometric morphometric assessment of the ‘batagurine process’ of testudinoid turtles. Amphibia-Reptilia 25: 369-379.CrossRef

· Johnson, J.B.; Burt, D.B. & DeWitt, T.J. (2008). Form, function, and fitness: pathways to survival. Evolution 62: 1243-1251. CrossRef

· Jones, M.E.H. (2008). Skull shape and feeding strategy in Sphenodon and other Rhynchocephalia (Diapsida: Lepidosauria). Journal of Morphology 269: 945-966.CrossRef

· Jorgensen, M.E. & Sheil C.A. (2008). Effects of temperature regime through premetamorphic ontogeny on shape of the chondrocranium in the American toad,Anaxyrus americanus. The Anatomical Record 291: 818-826. CrossRef

· Kaliontzopoulou, A.; Adams, D.C.; van der Meijden, A.; Perera, A. & Carretero, M.A. (in press). Relationships between head morphology, bite performance and ecology in two species of Podarcis wall lizards. Evolutionary Ecology DOI: 10.1007/s10682-011-9538-y. CrossRef

· Kaliontzopoulou, A.; Carretero, M.A. & Llorente, G.A. (2007). Multivariate and geometric morphometrics in the analysis of sexual dimorphism variation inPodarcis lizards. Journal of Morphology 268: 152-165. CrossRef

· Kaliontzopoulou, A.; Carretero, M.A. & Llorente, G.A. (2008). Head shape allometry and proximate causes of head sexual dimorphism in Podarcis lizards: joining linear and geometric morphometrics. Biological Journal of the Linnean Society 93: 111-124. CrossRef

· Kaliontzopoulou, A.; Carretero, M.A. & Llorente, G.A. (2010). Intraspecific ecomorphological variation: linear and geometric morphometrics reveal habitat-related patterns within Podarcis bocagei wall lizards. Journal of Evolutionary Biology 23: 1234-1244. CrossRef

· Kendall, D.G. (1984). Shape-manifolds, Procrustean metrics, and complex projective spaces. Bulletin of the London Mathematical Society 16: 81-121. CrossRef

· Kendall, D.G. (1985). Exact distributions for shapes of random triangles in convex sets. Advances in Applied Probability 17: 308-329. CrossRef

· Klingenberg, C.P. (1996). Multivariate allometry, In L.F. Marcus, M. Corti, A. Loy, G.J.P. Naylor & D.E. Slice (eds.) Advances in Morphometrics. Series: NATO ASI Series A: Life Sciences, vol. 284. Plenum Press, New York, pp. 23-49.

· Klingenberg, C.P. (2003). Quantitative genetics of geometric shape: heritability and the pitfalls of the univariate approach. Evolution 57: 191-195. CrossRef

· Klingenberg, C.P. (2010). There’ s something afoot in the evolution of ontogenies. BMC Evolutionary Biology 10: 221. CrossRef

· Klingenberg, C.P. (2011). MorphoJ: an integrated software package for geometric morphometrics. Molecular Ecology Resources 11: 353-357. CrossRef

· Klingenberg, C.P. & Gidaszewski, N.A. (2010). Testing and quantifying phylogenetic signals and homoplasy in morphometric data. Systematic Biology 59: 245-261. CrossRef

· Klingenberg, C.P. & Monteiro, L.R. (2005). Distances and directions in multidimensional shape spaces: implications for morphometric applications. Systematic Biology 54: 678-688. CrossRef

· Larson, P.M. (2002). Chondrocranial development in larval Rana sylvatica (Anura: Ranidae): morphometric analysis of cranial allometry and ontogenetic shape change. Journal of Morphology 252: 131-144. CrossRef

· Larson, P.M. (2004). Chondrocranial morphology and ontogenetic allometry in larval Bufo americanus (Anura, Bufonidae). Zoomorphology 123: 95-106. CrossRef

· Larson, P.M. (2005). Ontogeny, phylogeny, and morphology in anuran larvae: morphometric analysis of cranial development and evolution in Rana tadpoles (Anura: Ranidae). Journal of Morphology 264: 34-52. CrossRef

· Lawing, A.M. & Polly, P.D. (2010). Geometric morphometrics: recent applications to the study of evolution and development. Journal of Zoology 280: 1-7.CrossRef

· Leaché, A.D.; Koo, M.S.; Spencer, C.L.; Papenfuss, T.J.; Fisher, R.N. & McGuire, J.A. (2009). Quantifying ecological, morphological, and genetic variation to delimit species in the coast horned lizard species complex (Phrynosoma). Proceedings of the National Academy of Sciences USA 106: 12418-12423. CrossRef

· Ljubisavljević, K.; Urošević, A.; Aleksić, I. & Ivanović, A. (2010). Sexual dimorphism of skull shape in a lacertid lizard species (Podarcis spp., Dalmatolacerta sp.,Dinarolacerta sp.) revealed by geometric morphometrics. Zoology 113: 168-174. CrossRef

· Ljubisavljević, K.; Polović, L.; Urošević, A. & Ivanović, A. (2011). Patterns of morphological variation in the skull and cephalic scales of the lacertid lizardAlgyroides nigropunctatus. Herpetological Journal 21: 65-72.

· Lubiana, A. & Ferreira Júnior, P.D. (2009). Pivotal temperature and sexual dimorphism of Podocnemis expansa hatchlings (Testudines: Podocnemididae) from Bananal Island, Brazil. Zoologia 26: 527-533. CrossRef

· Manier, M.K. (2004). Geographic variation in the long-nosed snake Rhinocheilus lecontei (Colubridae): beyond the subspecies debate. Biological Journal of the Linnean Society 83: 65-85. CrossRef

· Marcus, L.F. (1990). Traditional morphometrics, In F.J. Rohlf & F.L. Bookstein (eds.) Proceedings of the Michigan Morphometrics Workshop. Series: Special Publications, vol. 2. University of Michigan Museum of Zoology, Ann Arbor, Michigan, USA, pp. 77-122.

· Mitteroecker, P. & Gunz, P. (2009). Advances in geometric morphometrics. Evolutionary Biology 36: 235-247. CrossRef

· Monteiro, L.R. (1999). Multivariate regression models and geometric morphometrics: the search for causal factors in the analysis of shape. Systematic Biology48: 192-199. CrossRef

· Monteiro, L.R. (2000). Why morphometrics is special: the problem with using partial warps as characters for phylogenetic inference. Systematic Biology 49: 796-800. CrossRef

· Monteiro, L.R. & Abe, A.S. (1997). Allometry and morphological integration in the skull of Tupinambis merianae (Lacertilia: Teiidae). Amphibia-Reptilia 18: 397-405. CrossRef

· Myers, E.M. & Adams, D.C. (2008). Morphology is decoupled from interspecific competition in Plethodon salamanders in the Shenandoah Mountains, USA.Herpetologica 64: 281-289. CrossRef 

· Nishizawa, H.; Asahara, M.; Kamezaki, N. & Arai, N. (2010). Differences in the skull morphology between juvenile and adult green turtles: implications for the ontogenetic diet shift. Current Herpetology 29: 97-101. CrossRef

· O’Higgins, P. & Jones, N. (2006). Tools for Statistical Shape Analysis. Hull York Medical School, York-Hull, United Kingdom. Available athttp://sites.google.com/site/hymsfme/resources.

· Pierce, S.E.; Angielczyk, K.D. & Rayfield, E.J. (2008). Patterns of morphospace occupation and mechanical performance in extant crocodilian skulls: a combined geometric morphometric and finite element modeling approach. Journal of Morphology 269: 840-864. CrossRef

· Pierce, S.E.; Angielczyk, K.D. & Rayfield, E.J. (2009a). Morphospace occupation in thalattosuchian crocodylomorphs: skull shape variation, species delineation and temporal patterns. Palaeontology 52: 1057-1097. CrossRef

· Pierce, S.E.; Angielczyk, K.D. & Rayfield, E.J. (2009b). Shape and mechanics in thalattosuchian (Crocodylomorpha) skulls: implications for feeding behaviour and niche partitioning. Journal of Anatomy 215: 555-576. CrossRef

· Piras, P.; Colangelo, P.; Adams, D.C.; Buscalioni, A.; Cubo, J.; Kotsakis, T.; Meloro, C. & Raia, P. (2010). The Gavialis–Tomistoma debate: the contribution of skull ontogenetic allometry and growth trajectories to the study of crocodylian relationships. Evolution & Development 12: 568-579. CrossRef

· Polly, P.D. & Head, J.J. (2004). Maximum-likelihood identification of fossils: taxonomic identification of Quaternary marmots (Rodentia, Mammalia) and identification of vertebral position in the pipesnake Cylindrophis (Serpentes, Reptilia), In A.M.T. Elewa (ed.) Morphometrics: Applications in Biology and Paleontology. Springer-Verlag, Berlin, pp. 197-222.

· Prieto-Marquez, A.; Gignac, P.M. & Joshi, S. (2007). Neontological evaluation of pelvic skeletal attributes purported to reflect sex in extinct non-avian archosaurs.Journal of Vertebrate Paleontology 27: 603-609. CrossRef

· Pritchard, P.C.H. (2008). Evolution and structure of the turtle shell, In J. Wyneken, M.H. Godfrey & V. Bels (eds.) Biology of Turtles. CRC Press, Boca Raton, Florida, USA, pp. 45-83.

· R Development Core Team (2010). R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna, Austria. Available at http://www.r-project.org/.

· Raia, P.; Guarino, F.M.; Turano, M.; Polese, G.; Rippa, D.; Carotenuto, F.; Monti, D.M.; Cardi, M. & Fulgione, D. (2010). The blue lizard spandrel and the island syndrome. BMC Evolutionary Biology 10: 289. CrossRef

· Rivera, G. (2008). Ecomorphological variation in shell shape of the freshwater turtle Pseudemys concinna inhabiting different aquatic flow regimes. Integrative and Comparative Biology 48: 769-787. CrossRef

· Rivera, G. & Claude, J. (2008). Environmental media and shape asymmetry: a case study on turtle shells. Biological Journal of the Linnean Society 94: 483-489.CrossRef

· Rivera, G. & Stayton, C.T. (2011). Finite element modeling of shell shape in the freshwater turtle Pseudemys concinna reveals a trade-off between mechanical strength and hydrodynamic efficiency. Journal of Morphology 272: 1192-1203. CrossRef

· Rodrigues, L.A. & Faria dos Santos, V. (2004). Sauropod Tracks – a geometric morphometric study, In A.M.T. Elewa (ed.) Morphometrics: Applications in Biology and Paleontology. Springer-Verlag, Berlin, pp. 129-142.

· Rohlf, F.J. (1986). Relationships among eigenshape analysis, Fourier analysis, and analysis of coordinates. Mathematical Geology 18: 845-854. CrossRef

· Rohlf, F.J. (1990). Fitting curves to outlines, In F.J. Rohlf & F.L. Bookstein (eds.) Proceedings of the Michigan Morphometrics Workshop. Series: Special Publications, Vol. 2. University of Michigan Museum of Zoology, Ann Arbor, Michigan, USA, pp. 167-177.

· Rohlf, F.J. (1998). On applications of geometric morphometrics to studies of ontogeny and phylogeny. Systematic Biology 47: 147-158. CrossRef

· Rohlf, F.J. (1999). Shape statistics: Procrustes superimpositions and tangent spaces. Journal of Classification 16: 197-223. CrossRef

· Rohlf, F.J. (2011). Morphometrics at SUNY Stony Brook. Department of Ecology and Evolution, State University of New York, Stony Brook, New York, USA. Available at http://life.bio.sunysb.edu/morph/.

· Rohlf, F.J. & Archie, J.W. (1984). A comparison of Fourier methods for the description of wing shape in mosquitoes (Diptera: Culicidae). Systematic Zoology33: 302-317. CrossRef

· Rohlf, F.J. & Bookstein, F.L. (1987). A comment on shearing as a method for “size correction”. Systematic Zoology 36: 356-367. CrossRef

· Rohlf, F.J. & Marcus, L.F. (1993). A revolution morphometrics. Trends in Ecology and Evolution 8: 129-132. CrossRef

· Rohlf, F.J. & Slice, D. (1990). Extensions of the Procrustes method for the optimal superimposition of landmarks. Systematic Zoology 39: 40-59. CrossRef

· Sheets, H.D. (2000). Integrated Morphometrics Package (IMP). Canisius College, Buffalo, New York, USA. Available at http://www2.canisius.edu/~sheets/.

· Siegel, A.F. & Benson, R.H. (1982). A robust comparison of biological shapes. Biometrics 38: 341-350. CrossRef

· Slice, D.E. (2001). Landmark coordinates aligned by Procrustes analysis do not lie in Kendall’s shape space. Systematic Biology 50: 141-149. CrossRef

· Slice, D.E. (2005). Modern morphometrics, In D.E. Slice (ed.) Modern Morphometrics in Physical Anthropology. Series: Developments in Primatology: Progress and Prospects (R.H. Tuttle, ed.). Kluwer Academics / Plenum Publishers, New York, pp. 1-46. CrossRef

· Slice, D.E.; Bookstein, F.L.; Marcus, L.F. & Rohlf, F.J. (1996). Appendix I. A glossary for geometric morphometrics, In L.F. Marcus, M. Corti, A. Loy, G.J.P. Naylor & D.E. Slice (eds.) Advances in Morphometrics. Series: NATO ASI Series A: Life Sciences, vol. 284. Plenum Press, New York, pp. 531-551.

· Smith, M.T. & Collyer, M.L. (2008). Regional variation and sexual dimorphism in head form of the prairie rattlesnake (Crotalus viridis viridis): comparisons using new analytical techniques and collection methods, In W.K. Hayes, K.R. Beaman, M.D. Cardwell & S.P. Bush (eds.) The Biology of Rattlesnakes. Loma Linda University Press, Loma Linda, California, USA, pp. 79-90.

· Sokal, R.R. & Rohlf, F.J. (1995). Biometry: The Principles and Practice of Statistics in Biological Research, 3^rd ed. W.H. Freeman, New York.

· Stayton, C.T. (2005). Morphological evolution of the lizard skull: A geometric morphometrics survey. Journal of Morphology 263: 47-59. CrossRef

· Stayton, C.T. (2006). Testing hypotheses of convergence with multivariate data: morphological and functional convergence among herbivorous lizards. Evolution60: 824-841.

· Stayton, C.T. (2009). Application of thin-plate spline transformations to finite element models, or, how to turn a bog turtle into a spotted turtle to analyze both.Evolution 63: 1348-1355.  CrossRef

· Stayton, C.T. (2011). Biomechanics on the half shell: functional performance influences patterns of morphological variation in the emydid turtle carapace. Zoology114: 213-223. CrossRef

· Stayton, C.T. & Ruta, M. (2006). Geometric morphometrics of the skull roof of stereospondyls (Amphibia: Temnospondyli). Palaeontology 49: 307-337. CrossRef

· Thompson, D.W. (1917). On Growth and Form. Cambridge University Press, Cambridge, United Kingdom.

· Valenzuela, N.; Adams, D.C.; Bowden, R.M. & Gauger, A.C. (2004). Geometric morphometric sex estimation for hatchling turtles: a powerful alternative for detecting subtle sexual shape dimorphism. Copeia 2004: 735-742. CrossRef

· Van Buskirk, J. (2009). Natural variation in morphology of larval amphibians: Phenotypic plasticity in nature? Ecological Monographs 79: 681-705. CrossRef

· Vidal, M.A.; Ortiz, J.C.; Ramírez, C.C. & Lamborot, M. (2005). Intraspecific variation in morphology and sexual dimorphism in Liolaemus tenuis (Tropiduridae).Amphibia-Reptilia 26: 343-351. CrossRef

· Vidal, M.A.; Veloso, A. & Méndez, M.A. (2006). Insular morphological divergence in the lizard Liolaemus pictus (Liolaemidae). Amphibia-Reptilia 27: 103-111.CrossRef

· Vieira, K.S.; Arzabe, C.; Hernández, M.I.M. & Vieira, W.L.S. (2008). An examination of morphometric variations in a neotropical toad population (Proceratophrys cristiceps, Amphibia, Anura, Cycloramphidae). PloS ONE 3: e3934. CrossRef

· Wells, K.D. (2007). The Ecology and Behavior of Amphibians. The University of Chicago Press, Chicago. CrossRef

· Witzmann, F.; Scholz, H. & Ruta, M. (2009). Morphospace occupation of temnospondyl growth series: a geometric morphometric approach. Alcheringa 33: 237-255. CrossRef

· Young, M.T. & Larvan, M.D. (2010). Macroevolutionary trends in the skull of sauropodomorph dinosaurs – the largest terrestrial animals to have ever lived, InA.M.T. Elewa (ed.) Morphometrics for Nonmorpometricians. Series: Lecture Notes in Earth Sciences, vol. 124. Springer-Verlag, Berlin, pp. 259-269.

· Young, M.T.; Brusatte, S.L.; Ruta, M. & de Andrade, M.B. (2010). The evolution of Metriorhynchoidea (mesoeucrocodylia, thalattosuchia): an integrated approach using geometric morphometrics, analysis of disparity, and biomechanics. Zoological Journal of the Linnean Society 158: 801-859. CrossRef

· Zelditch, M.L.; Swiderski, D.L.; Sheets, H.D. & Fink, W.L. (2004). Geometric Morphometrics for Biologists: A Primer. Elsevier Academic Press, San Diego, California, USA.

· Zuffi, M.A.L.; Sacchi, R.; Pupin, F. & Cencetti, T. (2011). Sexual size and shape dimorphism in the Moorish gecko (Tarentola mauritanica, Gekkota, Phyllodactylidae). North-Western Journal of Zoology 7: 189-197.