Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”

South American native ungulates include several extinct lineages that evolved within the context of South American Cenozoic geographic isolation. By the late–early Miocene Santacrucian, the orders Notoungulata, Litopterna, and Astrapotheria were differentiated. Recent ecomorphological studies highli...

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Detalles Bibliográficos
Autores principales: Cassini, Guillermo H., Muñoz, Nahuel Antu, Vizcaíno, Sergio Fabián
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Paleontología
Notoungulata
Litopterna
Santacrucian
Geometric Morphometrics
D’Arcy Thompson
Modularity
Morfometría Geométrica
Santacrucense
Modularidad
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79306
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79306
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Notoungulata
Litopterna
Santacrucian
Geometric Morphometrics
D’Arcy Thompson
Modularity
Morfometría Geométrica
Santacrucense
Modularidad
spellingShingle Paleontología
Notoungulata
Litopterna
Santacrucian
Geometric Morphometrics
D’Arcy Thompson
Modularity
Morfometría Geométrica
Santacrucense
Modularidad
Cassini, Guillermo H.
Muñoz, Nahuel Antu
Vizcaíno, Sergio Fabián
Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”
topic_facet Paleontología
Notoungulata
Litopterna
Santacrucian
Geometric Morphometrics
D’Arcy Thompson
Modularity
Morfometría Geométrica
Santacrucense
Modularidad
description South American native ungulates include several extinct lineages that evolved within the context of South American Cenozoic geographic isolation. By the late–early Miocene Santacrucian, the orders Notoungulata, Litopterna, and Astrapotheria were differentiated. Recent ecomorphological studies highlighted complex functional patterns between their habitat/diet and hypsodonty. In order to understand these relationships in an evolutionary context we used geometric morphometrics methods (27 3-D landmarks) to evaluate the morphological integration of two of the primary functional units of the mandible: the alveolar region and the ascending ramus. Principal component analyses (PCA) and two blocks Partial Least Squares analyses (PLS) were used to explore the patterns of variation and covariation between these two modules. The main variation in shape is related to the robusticity and curvature of the mandibular corpus, and the relative size of the angular and coronoid process. The PLS analyses show a very strong morphological integration within the Litopterna, but a pattern of modularity in the Notoungulata. There is a common pattern of covariation in Astrapotheria and Litopterna, which might be due to similar constraints. The different covariation patterns in notoungulates with respect to litopterns are in concordance with both the taxonomic and morphological diversity of the clades, particularly in the typotheres. The modularity present in notoungulates could have allowed specializations in each module of the mandible, related to crown height or muscle attachments, without a high morphological constrain. This could have resulted in their high morphological diversity, in contrast with the more conservative morphology present in litopterns.
format Articulo
Articulo
author Cassini, Guillermo H.
Muñoz, Nahuel Antu
Vizcaíno, Sergio Fabián
author_facet Cassini, Guillermo H.
Muñoz, Nahuel Antu
Vizcaíno, Sergio Fabián
author_sort Cassini, Guillermo H.
title Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”
title_short Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”
title_full Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”
title_fullStr Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”
title_full_unstemmed Morphological integration of native South American ungulate mandibles: a tribute to D’arcy Thompson in the centennial of “on growth and form”
title_sort morphological integration of native south american ungulate mandibles: a tribute to d’arcy thompson in the centennial of “on growth and form”
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/79306
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