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the claim

The Dunkleosteus was a superpredator of the latest Devonian period that reached lengths between 3 and 9 meters.

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the Dunkleosteus was a superpredator of the latest Devonian period that reached lengths between 3 and 9 meters?

No. Recent paleontological studies refute the traditional view that Dunkleosteus reached lengths between 5 and 9 meters, demonstrating through robust scaling methods that typical adults actually measured closer to 3 to 4 meters.

Verdict: REFUTED · 0 sources for, 2 against · Last checked

The analysis

The claim asserts that Dunkleosteus reached lengths between 3 and 9 meters. While the lower end (3 meters) is supported by recent findings, the upper end (up to 9 meters) is explicitly refuted by recent paleobiological studies showing that older length estimates were overestimates caused by flawed scaling models. Newer research indicates maximum sizes around 4.1 meters, directly contradicting the traditional 3-to-9-meter range which assumes much larger maximum lengths.

Evidence against · 2
A Devonian Fish Tale: A New Method of Body Length Estimation Suggests Much Smaller Sizes for Dunkleosteus terrelli (Placodermi: Arthrodira)
2023
This study uses a new body length estimation method based on orbit-opercular length to show that Dunkleosteus terrelli was much smaller than previously thought, typically around 3.4 meters with the largest reaching about 4.1 meters.
Get citation
Engelman, R. K. (2023). A Devonian Fish Tale: A New Method of Body Length Estimation Suggests Much Smaller Sizes for Dunkleosteus terrelli (Placodermi: Arthrodira). doi.org. https://doi.org/10.3390/d15030318

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More against · 1
Giant, swimming mouths: oral dimensions of extant sharks do not accurately predict body size in <i>Dunkleosteus terrelli</i> (Placodermi: Arthrodira)
2023
This paper demonstrates that previous length estimates of 5.3 to 8.8 meters for Dunkleosteus, based on shark mouth proportions, are mathematically and biologically unlikely because arthrodires had proportionally larger mouths.
Get citation
Engelman, R. (2023). Giant, swimming mouths: oral dimensions of extant sharks do not accurately predict body size in
                    <i>Dunkleosteus terrelli</i>
                    (Placodermi: Arthrodira). doi.org. https://doi.org/10.7717/peerj.15131

What does the evidence say?

The claim asserts that Dunkleosteus reached lengths between 3 and 9 meters. While the lower end (3 meters) is supported by recent findings, the upper end (up to 9 meters) is explicitly refuted by recent paleobiological studies showing that older length estimates were overestimates caused by flawed scaling models. Newer research indicates maximum sizes around 4.1 meters, directly contradicting the traditional 3-to-9-meter range which assumes much larger maximum lengths.

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