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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

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Early Gnathostome Phylogeny Revisited: Multiple Method Consensus.

Tuo Qiao¹, Benedict King², John A Long²

¹Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China.

|September 21, 2016

Summary

This summary is machine-generated.

Phylogenetic analyses of jawed vertebrates reveal placoderms are paraphyletic and

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Area of Science:

Paleontology
Evolutionary Biology
Phylogenetics

Background:

Recent studies proposed consistent phylogenetic scenarios for jawed vertebrates, but relationships within groups like placoderms and early gnathostomes remained controversial.
Previous phylogenetic conflicts were partly attributed to inadvertent miscodings in datasets.

Purpose of the Study:

To resolve controversial phylogenetic relationships among early jawed vertebrates.
To construct and analyze the most comprehensive morphological dataset to date for early gnathostomes.
To compare phylogenetic hypotheses derived from Maximum Parsimony (MP), Bayesian Inference (BI), and Maximum Likelihood (ML) methods.

Main Methods:

Compilation of a new, comprehensive morphological dataset including 103 taxa and 335 characters.
Phylogenetic analyses using Maximum Parsimony (MP), Bayesian Inference (BI), and Maximum Likelihood (ML) approaches.
Comparative analysis to identify consensus and incongruence between different phylogenetic methods.

Main Results:

Consistent corroboration of placoderm paraphyly, 'acanthodians' as paraphyletic stem chondrichthyans, Entelognathus as a stem gnathostome, and the Guiyu-lineage as stem sarcopterygians.
Incongruence between methods was minimal and primarily involved poorly known or specialized taxa.
Multiple phylogenetic analyses of morphological data are complementary, not redundant.

Conclusions:

The study provides a robust phylogenetic framework for early jawed vertebrates, resolving long-standing controversies.
The comprehensive dataset and multiple analytical approaches enhance confidence in the recovered evolutionary relationships.
This work underscores the value of integrating diverse phylogenetic methods for a more complete understanding of evolutionary history.