Postweaning Skull Growth in Living American and Australasian Marsupials: Allometry and Evolution

Flores, David A.; Abdala, Fernando; Giannini, Norberto P.

doi:10.1007/978-3-030-88800-8_6-1

American and Australasian Marsupials 2022

DOI: 10.1007/978-3-030-88800-8_6-1

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Postweaning Skull Growth in Living American and Australasian Marsupials: Allometry and Evolution

David A. Flores

Fernando Abdala

Norberto P. Giannini

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2023

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Cited by 2 publications

(1 citation statement)

References 133 publications

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“…In palaeontological–neontological studies of ontogeny, which also include dentition (and we have expertise in this; e.g. Abdala & Giannini, 2000; Abdala et al, 2001; Flores et al, 2006; Jasinoski et al, 2015; Jasinoski & Abdala, 2017a; Flores et al, 2022), skull size is certainly a very important factor, as are also the changes in allometry perceived from juvenile to adults. Such changes are expected: for example, negative allometry for braincase and sense organs and positive allometry for the splanchnocranium.…”

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confidence: 99%

On taxonomic issues, ontogenetic series and tooth replacement. Comments on Diphyodont tooth replacement of Brasilodon—A late Triassic eucynodont that challenges the time of origin of mammals by Cabreira et al.

et al. 2023

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On taxonomic issues, ontogenetic series and tooth replacement. Comments on Diphyodont tooth replacement of Brasilodon-A late Triassic eucynodont that challenges the time of origin of mammals by Cabreira et al. Recently, Cabreira et al. (2022) published a contribution analysing the dental replacement of Brasilodon, a cynodont from the Brazilian Norian, concluding that it had a mammalian (diphyodont) type of replacement. In this note, we will only deal tangentially with their main conclusion and instead will concentrate on criticism posed by Cabreira et al. (2022) to the contributions of Abdala et al. (2013) and Norton et al. (2020).

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confidence: 99%

On taxonomic issues, ontogenetic series and tooth replacement. Comments on Diphyodont tooth replacement of Brasilodon—A late Triassic eucynodont that challenges the time of origin of mammals by Cabreira et al.

et al. 2023

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Evolution, divergence, and convergence in the mandibles of opossums (Didelphidae, Didelphimorphia)

Silva-Neto,

Pavan,

Astúa

2023

Current Zoology

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Didelphid marsupials are considered a morphologically unspecialized group with a generalist diet that includes vertebrates, invertebrates, and plant matter. While cranium and scapula variation has already been examined within Didelphidae, variation in mandible shape, usually associated with diet or phylogeny in other mammalian groups, has not yet been properly assessed in the family. We evaluated the variation in mandible shape and size of didelphids (2470 specimens belonging to 94 species) using 2D geometric morphometrics. We classified the diet of the didelphids into four broad categories to assess whether morphospace ordination relates to dietary habits. We also provided the most comprehensive phylogeny for the family (123 out of the 126 living species) using 10 nuclear and mitochondrial genes. We then mapped mandible size and shape onto that phylogeny for 93 selected taxa and ancestral size and shapes were reconstructed by parsimony. We found phylogenetically structured variation in mandible morphology between didelphid groups, and our results indicate that they have a significant phylogenetic signal. The main axis of shape variation is poorly related to size, but the second is strongly allometric, indicating that allometry is not the main factor in shaping morphological diversity on their mandibles. Our results indicate that the shape and size of the ancestral mandible of didelphids would be similar to that of the current species of the genus Marmosa.

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Postweaning Skull Growth in Living American and Australasian Marsupials: Allometry and Evolution

Cited by 2 publications

References 133 publications

On taxonomic issues, ontogenetic series and tooth replacement. Comments on Diphyodont tooth replacement of Brasilodon—A late Triassic eucynodont that challenges the time of origin of mammals by Cabreira et al.

On taxonomic issues, ontogenetic series and tooth replacement. Comments on Diphyodont tooth replacement of Brasilodon—A late Triassic eucynodont that challenges the time of origin of mammals by Cabreira et al.

Evolution, divergence, and convergence in the mandibles of opossums (Didelphidae, Didelphimorphia)

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