Phylogenetic signal and character compatibility in the appendicular skeleton of early tetrapods

Ruta, Marcello (2011) Phylogenetic signal and character compatibility in the appendicular skeleton of early tetrapods. In: Studies on Fossil Tetrapods. Special Papers in Palaeontology (86). Oxford: Wiley-Blackwell, pp. 31-43. ISBN 9781444361896

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Full text URL: http://dx.doi.org/10.1111/j.1475-4983.2011.01071.x

Abstract

A new data set of appendicular skeletal characters
in a representative sample of fin- and limb-bearing taxa
spanning the fish–tetrapod transition is used to test the phylogenetic
utility of both girdle and paired appendage data. A
cladistic analysis retrieves most traditional taxonomic
groups, highlighting only partial conflict along internal
branches that sit deep in the phylogeny, and good to moderate
support for within-group branching sequences. Most of
the conflict affects stem tetrapods from the Devonian, with
Ichthyostega, Hynerpeton and the Catskill humerus as particularly
unstable taxa. Phylogenetic constraints that reflect
recent hypotheses of relationships do not entail significant
differences (in terms of character fit) from the shortest trees.
The data set is subjected to an analysis of trait compatibility.
Results show that predefined character partitions (i.e. shoulder
girdle, pelvic girdle, anterior paired appendages, posterior
paired appendages and autopodium plus general
features) do not reveal strong within-set correlation or any
correlation with global character compatibilities. In addition,
character clusters exhibit little logical and ⁄ or functional
interdependence.

Item Type:Book Section
Additional Information:A new data set of appendicular skeletal characters in a representative sample of fin- and limb-bearing taxa spanning the fish–tetrapod transition is used to test the phylogenetic utility of both girdle and paired appendage data. A cladistic analysis retrieves most traditional taxonomic groups, highlighting only partial conflict along internal branches that sit deep in the phylogeny, and good to moderate support for within-group branching sequences. Most of the conflict affects stem tetrapods from the Devonian, with Ichthyostega, Hynerpeton and the Catskill humerus as particularly unstable taxa. Phylogenetic constraints that reflect recent hypotheses of relationships do not entail significant differences (in terms of character fit) from the shortest trees. The data set is subjected to an analysis of trait compatibility. Results show that predefined character partitions (i.e. shoulder girdle, pelvic girdle, anterior paired appendages, posterior paired appendages and autopodium plus general features) do not reveal strong within-set correlation or any correlation with global character compatibilities. In addition, character clusters exhibit little logical and ⁄ or functional interdependence.
Keywords:early tetrapods, girdles, paired appendages, phylogeny, trait correlation
Subjects:C Biological Sciences > C182 Evolution
C Biological Sciences > C300 Zoology
C Biological Sciences > C191 Biometry
F Physical Sciences > F641 Palaeontology
Divisions:College of Science > School of Life Sciences
ID Code:6251
Deposited By: Marcello Ruta
Deposited On:25 Sep 2012 19:47
Last Modified:21 Jul 2014 08:20

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