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The unbearable uncertainty of panarthropod relationships

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Subject: The unbearable uncertainty of panarthropod relationships
From: eastside.erik@gmail.com (erik simpson)
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by: erik simpson - Thu, 30 Mar 2023 18:12 UTC

https://royalsocietypublishing.org/doi/10.1098/rsbl.2022.0497 (open access)

This paper discusses the difficulties in establishing definitive phylogenies of the basic divisions within Ecdysozoa. The conclusion reached is that at present the data and methods are incapable of distinguishing between three competing and incompatible hypotheses. The principle monkey wrench is the question of placement of Tardigrada. The different possibilities are clearly laid out in Fig 1.

Possible resolution of some the difficulties are suggested in the "Discussion" section, along with strong support for further analysis to include both mophological and genetic data wherever it is availble. If Tardigrada were an extinct phylum, there'd be little chance of placing it definitively within Ecdysozoa, but remarkably they're still with us. Maybe they will yet tell their story.

Subject	Author
The unbearable uncertainty of panarthropod relationships	erik simpson