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Categorical versus geometric morphometric approaches to characterising the evolution of morphological disparity in Osteostraci (Vertebrata, stem-Gnathostomata)

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Categorical versus geometric morphometric approaches to characterising the evolution of morphological disparity in Osteostraci (Vertebrata, stem-Gnathostomata)

dc.contributor.author	Ferrón, Humberto G.
dc.contributor.author	Greenwood, J. M.
dc.contributor.author	Deline, B.
dc.contributor.author	Martínez Pérez, Carlos
dc.contributor.author	Botella Sevilla, Hector
dc.contributor.author	Samson, R. S.
dc.contributor.author	Ruta, M.
dc.contributor.author	Donoghue, P. C. J
dc.date.accessioned	2023-03-01T17:18:24Z
dc.date.available	2023-03-01T17:18:24Z
dc.date.issued	2020
dc.identifier.citation	FERRON, H. G. GREENWOOD, J. M. DELINE, B. MARTINEZ-PEREZ, C. BOTELLA, H. SANSOM, R. S. RUTA, M. DONOGHUE, P. C. J 2020 Categorical versus geometric morphometric approaches to characterising the evolution of morphological disparity in Osteostraci (Vertebrata, stem-Gnathostomata) Palaeontology 63 5 717 732
dc.identifier.uri	https://hdl.handle.net/10550/85577
dc.description.abstract	Morphological variation (disparity) is almost invariably characterized by two non-mutually exclusive approaches: (1) quantitatively, through geometric morphometrics; and (2) in terms of discrete, 'cladistic', or categorical characters. Uncertainty over the comparability of these approaches diminishes the potential to obtain nomothetic insights into the evolution of morphological disparity and the few benchmarking studies conducted so far show contrasting results. Here, we apply both approaches to characterizing morphology in the stem-gnathostome clade Osteostraci in order to assess congruence between these alternative methods as well as to explore the evolutionary patterns of the group in terms of temporal disparity and the influence of phylogenetic relationships and habitat on morphospace occupation. Our results suggest that both approaches yield similar results in morphospace occupation and clustering, but also some differences indicating that these metrics may capture different aspects of morphology. Phylomorphospaces reveal convergence towards a generalized 'horseshoe'-shaped cranial morphology and two strong trends involving major groups of osteostracans (benneviaspidids and thyestiids), which probably reflect adaptations to different lifestyles. Temporal patterns of disparity obtained from categorical and morphometric approaches appear congruent, however, disparity maxima occur at different times in the evolutionary history of the group. The results of our analyses indicate that categorical and continuous data sets may characterize different patterns of morphological disparity and that discrepancies could reflect preservational limitations of morphometric data and differences in the potential of each data type for characterizing more or less inclusive aspects of overall phenotype.
dc.language.iso	eng
dc.relation.ispartof	Palaeontology, 2020, vol. 63, num. 5, p. 717-732
dc.subject	Paleontologia
dc.title	Categorical versus geometric morphometric approaches to characterising the evolution of morphological disparity in Osteostraci (Vertebrata, stem-Gnathostomata)
dc.type	journal article	es_ES
dc.date.updated	2023-03-01T17:18:25Z
dc.identifier.doi	10.1111/pala.12482
dc.identifier.idgrec	136148
dc.rights.accessRights	open access	es_ES