Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)

The Paucituberculata is an endemic group of South American marsupials, recorded from the early Cenozoic up to the present. In this report, the most comprehensive phylogenetic analysis of Paucituberculata to date is presented. Fifty-seven terminal species were scored for 74 new and re-examined charac...

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Autor principal: Abello, María Alejandra
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Naturales
Abderitidae
Caenolestidae
Caenozoic
Palaeothentidae
South America
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85600
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85600
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Abderitidae
Caenolestidae
Caenozoic
Palaeothentidae
South America
spellingShingle Ciencias Naturales
Abderitidae
Caenolestidae
Caenozoic
Palaeothentidae
South America
Abello, María Alejandra
Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)
topic_facet Ciencias Naturales
Abderitidae
Caenolestidae
Caenozoic
Palaeothentidae
South America
description The Paucituberculata is an endemic group of South American marsupials, recorded from the early Cenozoic up to the present. In this report, the most comprehensive phylogenetic analysis of Paucituberculata to date is presented. Fifty-seven terminal species were scored for 74 new and re-examined characters. Homologies of dental characters used in previous systematic studies were critically reviewed to evaluate their inclusion in the analysis. Phylogenetic results corroborated two major paucituberculatan clades, Palaeothentoidea and Caenolestoidea, and the main palaeothentoid groupings: Pichipilidae, Palaeothentidae, and Abderitidae. Taxon sampling and reinterpretations of molar cusp and crest homologies played an important role in the generation of new phylogenetic hypotheses. The main differences with respect to previous phylogenies were focused on palaeothentoid relationships: Palaeothentes boliviensis and Pilchenia lucina are not members of Palaeothentidae but instead clustered with Pilchenia intermedia and P. antiqua, forming the sister-group of a Palaeothentidae+Abderitidae clade, and Titanothentes simpsoni, previously considered a palaeothentine, is nested within the Acdestinae clade. Based on the time-calibrated phylogeny, the following stages in the paucituberculatan evolutionary history are suggested: origin of the group, in the Paleocene to early Eocene at the latest, split of Caenolestoidea and Palaeothentoidea clades during the late early to middle Eocene, evolutionary radiation of palaeothentid and abderitid lineages near the Oligocene-Eocene boundary, and decreased diversity and extinction of palaeothentoids during the middle Miocene.
format Articulo
Articulo
author Abello, María Alejandra
author_facet Abello, María Alejandra
author_sort Abello, María Alejandra
title Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)
title_short Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)
title_full Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)
title_fullStr Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)
title_full_unstemmed Analysis of dental homologies and phylogeny of Paucituberculata (Mammalia: Marsupialia)
title_sort analysis of dental homologies and phylogeny of paucituberculata (mammalia: marsupialia)
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85600
work_keys_str_mv AT abellomariaalejandra analysisofdentalhomologiesandphylogenyofpaucituberculatamammaliamarsupialia
bdutipo_str Repositorios
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