Morphometric analysis of dinosaur eggshells: constraints of size on shape

Show simple item record Bravo, Ana María Marugán Lobón, Jesús 2020-11-26T13:17:23Z 2020-11-26T13:17:23Z 2012-11-12
dc.identifier.citation Historical Biology, vol.25, n.5-6, 2013, 697-704 es_ES
dc.identifier.issn 1029-2381
dc.description.abstract tudies on fossil eggs and eggshells have been traditionally focused on analysis of microstructure and systematic classification, but few attempts have been made to examine the variability of eggshell characters. This work examines the variability of one diagnostic character, shape of the calcitic units, of some dinosaur eggshells by using outline shape analysis (elliptic Fourier analysis). The studied material belongs to five different oospecies of the parafamily Megaloolithidae Zhao, 1979. To test shape variation within and between oospecies, an analysis on 129 outlines was carried out and their variability was summarised by principal component analysis. We then tested if the shape of megaloolithid units changes according to size (i.e. allometry). A regression analysis between eggshell unit shape and two different size measurements (centroid size and eggshell thickness) showed that the thinnest eggshells (thickness ≤ 1 mm) have different shapes than thicker ones ( ≥ 2.5 mm). Our results stress that the variability in the shape of eggshell units in Megaloolithus oospecies is correlated to size (i.e. eggshell thickness), a phenomenon that should be then considered carefully when determining oospecies, since a single oospecies can show both a wide range of eggshell thickness and combined with different eggshell unit shapes es_ES
dc.description.sponsorship Museo Geominero, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Unidad de Paleontología, Departamento de Biología, Universidad Autónoma de Madrid, España es_ES
dc.language.iso en es_ES
dc.publisher Taylor and Francis es_ES
dc.rights Otro es_ES
dc.subject eggshells es_ES
dc.subject Fourier es_ES
dc.subject Megaloolithidae es_ES
dc.subject dinosaur es_ES
dc.subject size es_ES
dc.subject shape es_ES
dc.title Morphometric analysis of dinosaur eggshells: constraints of size on shape es_ES
dc.type Postprint es_ES
dc.relation.publisherversion es_ES
dc.identifier.doi es_ES

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