Cargando…

A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates

Phylogenetic analysis of morphological data proceeds from a fixed set of primary homology statements, the character-by-taxon matrix. However, there are cases where multiple conflicting homology statements can be justified from comparative anatomy. The upper jaw bones of placoderms have traditionally...

Descripción completa

Detalles Bibliográficos
Autores principales: King, Benedict, Rücklin, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: eLife Sciences Publications, Ltd 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793628/
https://www.ncbi.nlm.nih.gov/pubmed/33274719
http://dx.doi.org/10.7554/eLife.62374
_version_ 1783634028811780096
author King, Benedict
Rücklin, Martin
author_facet King, Benedict
Rücklin, Martin
author_sort King, Benedict
collection PubMed
description Phylogenetic analysis of morphological data proceeds from a fixed set of primary homology statements, the character-by-taxon matrix. However, there are cases where multiple conflicting homology statements can be justified from comparative anatomy. The upper jaw bones of placoderms have traditionally been considered homologous to the palatal vomer-dermopalatine series of osteichthyans. The discovery of ‘maxillate’ placoderms led to the alternative hypothesis that ‘core’ placoderm jaw bones are premaxillae and maxillae lacking external (facial) laminae. We introduce a BEAST2 package for simultaneous inference of homology and phylogeny, and find strong evidence for the latter hypothesis. Phenetic analysis of reconstructed ancestors suggests that maxillate placoderms are the most plesiomorphic known gnathostomes, and the shared cranial architecture of arthrodire placoderms, maxillate placoderms and osteichthyans is inherited. We suggest that the gnathostome ancestor possessed maxillae and premaxillae with facial and palatal laminae, and that these bones underwent divergent evolutionary trajectories in placoderms and osteichthyans.
format Online
Article
Text
id pubmed-7793628
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher eLife Sciences Publications, Ltd
record_format MEDLINE/PubMed
spelling pubmed-77936282021-01-11 A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates King, Benedict Rücklin, Martin eLife Evolutionary Biology Phylogenetic analysis of morphological data proceeds from a fixed set of primary homology statements, the character-by-taxon matrix. However, there are cases where multiple conflicting homology statements can be justified from comparative anatomy. The upper jaw bones of placoderms have traditionally been considered homologous to the palatal vomer-dermopalatine series of osteichthyans. The discovery of ‘maxillate’ placoderms led to the alternative hypothesis that ‘core’ placoderm jaw bones are premaxillae and maxillae lacking external (facial) laminae. We introduce a BEAST2 package for simultaneous inference of homology and phylogeny, and find strong evidence for the latter hypothesis. Phenetic analysis of reconstructed ancestors suggests that maxillate placoderms are the most plesiomorphic known gnathostomes, and the shared cranial architecture of arthrodire placoderms, maxillate placoderms and osteichthyans is inherited. We suggest that the gnathostome ancestor possessed maxillae and premaxillae with facial and palatal laminae, and that these bones underwent divergent evolutionary trajectories in placoderms and osteichthyans. eLife Sciences Publications, Ltd 2020-12-04 /pmc/articles/PMC7793628/ /pubmed/33274719 http://dx.doi.org/10.7554/eLife.62374 Text en © 2020, King and Rücklin http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Evolutionary Biology
King, Benedict
Rücklin, Martin
A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
title A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
title_full A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
title_fullStr A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
title_full_unstemmed A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
title_short A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
title_sort bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates
topic Evolutionary Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793628/
https://www.ncbi.nlm.nih.gov/pubmed/33274719
http://dx.doi.org/10.7554/eLife.62374
work_keys_str_mv AT kingbenedict abayesianapproachtodynamichomologyofmorphologicalcharactersandtheancestralphenotypeofjawedvertebrates
AT rucklinmartin abayesianapproachtodynamichomologyofmorphologicalcharactersandtheancestralphenotypeofjawedvertebrates
AT kingbenedict bayesianapproachtodynamichomologyofmorphologicalcharactersandtheancestralphenotypeofjawedvertebrates
AT rucklinmartin bayesianapproachtodynamichomologyofmorphologicalcharactersandtheancestralphenotypeofjawedvertebrates