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A Practical Guide to Phylogenetics for Nonexperts
Published on: February 5, 2014
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CONGRUENCE BETWEEN SUPERPOSITIONAL AND PHYLOGENETIC PATTERNS: COMPARING CLADISTIC PATTERNS WITH FOSSIL RECORDS.
Mark A Norell1, Michael J Novacek1
1Department of Vertebrate Paleontology, American Museum of Natural History, 79th Street at Central Park West, New York, New York 10024, USA.
Cladistics : the International Journal of the Willi Hennig Society
|December 21, 2021
Summary
Fossil records and cladistic analysis generally align, supporting their use in reconstructing evolutionary history. However, data quality and completeness significantly impact the reliability of these phylogenetic insights.
Area of Science:
- Paleontology
- Evolutionary Biology
- Systematics
Background:
- The fossil record provides direct evidence of past life, crucial for understanding evolutionary history and phylogeny.
- Incomplete fossil records have led to debates about their secondary role in phylogenetic hypotheses for extant taxa.
- The reliability of fossil data hinges on the congruence between stratigraphic relationships and phylogenetic events.
Purpose of the Study:
- To assess the correlation between fossil first occurrence data and phylogenetic results from cladistic analysis in vertebrates.
- To evaluate the influence of data completeness and resolution on the congruence between stratigraphic and phylogenetic information.
Main Methods:
- Examined 38 vertebrate case studies comparing fossil age data with cladistic analysis outcomes.
- Assessed the degree of fit between superpositional relationships (stratigraphy) and phylogenetic sequences.
- Analyzed factors influencing correlation, including data abundance, resolution, and precision of age dating.
Main Results:
- Observed a general correspondence between superpositional and cladistic data across vertebrate taxa.
- High correlations were found in taxa with abundant fossil and cladistic data (e.g., horses, ungulates, synapsids, basal archosaurs).
- Poor correlations were noted in groups with limited fossil records or short durations (e.g., primates), and when data resolution was low.
Conclusions:
- Stratigraphic occurrence aligns well with independently derived phylogenies in many vertebrate groups.
- Fossil data, when sufficiently complete and resolved, are highly valuable for phylogenetic reconstruction.
- Cladistic resolution often surpasses superpositional resolution, highlighting the complementary nature of these data types.
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