Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic

All stereospondyl taxa previously placed within Rhytidosteidae are reviewed in a phylogenetic context. A parsimony analysis shows that Pneumatostega, Trucheosaurus, Rhytidosteus and Nanolania are placed outside Rhytidosteidae. If an implied weighting method is introduced in order to downweight homop...

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Autores principales: Dias-Da-Silva, S., Marsicano, C.
Formato: JOUR
Materias:
Early Triassic
Late Permian
Palaeobiogeography
Pangaea
Phylogeny
Temnospondyli
amphibian
biostratigraphy
cladistics
paleoenvironment
paleogeography
parsimony analysis
Permian
species diversity
taxonomy
topology
Triassic
Australia
Amphibia
Stereospondyli
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14772019_v9_n2_p305_DiasDaSilva
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14772019_v9_n2_p305_DiasDaSilva
record_format dspace
spelling todo:paper_14772019_v9_n2_p305_DiasDaSilva2023-10-03T16:19:11Z Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic Dias-Da-Silva, S. Marsicano, C. Early Triassic Late Permian Palaeobiogeography Pangaea Phylogeny Temnospondyli amphibian biostratigraphy cladistics paleoenvironment paleogeography parsimony analysis Permian species diversity taxonomy topology Triassic Australia Amphibia Stereospondyli Temnospondyli All stereospondyl taxa previously placed within Rhytidosteidae are reviewed in a phylogenetic context. A parsimony analysis shows that Pneumatostega, Trucheosaurus, Rhytidosteus and Nanolania are placed outside Rhytidosteidae. If an implied weighting method is introduced in order to downweight homoplastic characters, then these taxa are placed within rhytidosteids (with the exception of Rhytidosteus), thus forming a resolved monophyletic group. This group is supported by four synapomorphies, including a twisted pterygoid quadrate ramus and sculpture consisting of a reticulate pattern with pustules or nodules at the junction between adjacent crests and ridges. Based on the topology of a majority rule consensus tree, we postulate a close relationship among all eastern Gondwanan rhytidosteids (Australian and Indian taxa) and among western Gondwanan taxa (South America, South Africa and Madagascar). Laurasian Boreopelta and Peltostega are successive paraphyletic taxa of both eastern and western groups. The Australian family 'Derwentiidae' is nested within Rhytidosteidae and is redefined as a subfamily (Derwentiinae nov.) which also includes Indobrachyops. Peltosteginae and Indobrachyopidae as currently defined in the literature are not supported. Rhytidosteinae is also not supported because Laidleria, Pneumatostega and Rhytidosteus do not emerge as a clade. The presence of the rhytidosteid Trucheosaurus major in the Late Permian of Australia suggests that rhytidosteids were already diversified at that time. Increasing efforts to collect Upper Permian and Lower Triassic rhytidosteids should help to improve stratigraphical, palaeogeographical and phylogenetic information regarding this widespread group of temnospondyls. Copyright © 2011 The Natural History Museum. Fil:Marsicano, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14772019_v9_n2_p305_DiasDaSilva
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Early Triassic
Late Permian
Palaeobiogeography
Pangaea
Phylogeny
Temnospondyli
amphibian
biostratigraphy
cladistics
paleoenvironment
paleogeography
parsimony analysis
Permian
species diversity
taxonomy
topology
Triassic
Australia
Amphibia
Stereospondyli
Temnospondyli
spellingShingle Early Triassic
Late Permian
Palaeobiogeography
Pangaea
Phylogeny
Temnospondyli
amphibian
biostratigraphy
cladistics
paleoenvironment
paleogeography
parsimony analysis
Permian
species diversity
taxonomy
topology
Triassic
Australia
Amphibia
Stereospondyli
Temnospondyli
Dias-Da-Silva, S.
Marsicano, C.
Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic
topic_facet Early Triassic
Late Permian
Palaeobiogeography
Pangaea
Phylogeny
Temnospondyli
amphibian
biostratigraphy
cladistics
paleoenvironment
paleogeography
parsimony analysis
Permian
species diversity
taxonomy
topology
Triassic
Australia
Amphibia
Stereospondyli
Temnospondyli
description All stereospondyl taxa previously placed within Rhytidosteidae are reviewed in a phylogenetic context. A parsimony analysis shows that Pneumatostega, Trucheosaurus, Rhytidosteus and Nanolania are placed outside Rhytidosteidae. If an implied weighting method is introduced in order to downweight homoplastic characters, then these taxa are placed within rhytidosteids (with the exception of Rhytidosteus), thus forming a resolved monophyletic group. This group is supported by four synapomorphies, including a twisted pterygoid quadrate ramus and sculpture consisting of a reticulate pattern with pustules or nodules at the junction between adjacent crests and ridges. Based on the topology of a majority rule consensus tree, we postulate a close relationship among all eastern Gondwanan rhytidosteids (Australian and Indian taxa) and among western Gondwanan taxa (South America, South Africa and Madagascar). Laurasian Boreopelta and Peltostega are successive paraphyletic taxa of both eastern and western groups. The Australian family 'Derwentiidae' is nested within Rhytidosteidae and is redefined as a subfamily (Derwentiinae nov.) which also includes Indobrachyops. Peltosteginae and Indobrachyopidae as currently defined in the literature are not supported. Rhytidosteinae is also not supported because Laidleria, Pneumatostega and Rhytidosteus do not emerge as a clade. The presence of the rhytidosteid Trucheosaurus major in the Late Permian of Australia suggests that rhytidosteids were already diversified at that time. Increasing efforts to collect Upper Permian and Lower Triassic rhytidosteids should help to improve stratigraphical, palaeogeographical and phylogenetic information regarding this widespread group of temnospondyls. Copyright © 2011 The Natural History Museum.
format JOUR
author Dias-Da-Silva, S.
Marsicano, C.
author_facet Dias-Da-Silva, S.
Marsicano, C.
author_sort Dias-Da-Silva, S.
title Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic
title_short Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic
title_full Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic
title_fullStr Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic
title_full_unstemmed Phylogenetic reappraisal of Rhytidosteidae (Stereospondyli: Trematosauria), temnospondyl amphibians from the Permian and Triassic
title_sort phylogenetic reappraisal of rhytidosteidae (stereospondyli: trematosauria), temnospondyl amphibians from the permian and triassic
url http://hdl.handle.net/20.500.12110/paper_14772019_v9_n2_p305_DiasDaSilva
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AT marsicanoc phylogeneticreappraisalofrhytidosteidaestereospondylitrematosauriatemnospondylamphibiansfromthepermianandtriassic
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