Ornithischia 2024
From the Fonsesca et al 2024 abstract:
“Resolving the evolutionary relationships of early diverging (‘basal’) ornithischian dinosaurs is a challenging topic in palaeontology, with multiple competing hypotheses on the phylogenetic relationships of heterodontosaurids, ‘hypsilophodontids’, and other early-diverging forms. These hypotheses cannot be directly compared because they are derived from differently constructed datasets (i.e. distinct samples of taxa and characters).”
Solution: add taxa, both ingroup and outgroup.
“This study aims to address these issues by revising and combining the distinct datasets into a single analysis in order to create the most comprehensive dataset for the investigation of the phylogenetic relationships of early-diverging ornithischians.”
The LRT is more comprehensive.
“A diphyletic model of Dinosauria is supported, with silesaurs nesting as members of Ornithischia.”
Diphyletic? Not monophyletic? And no details in the abstract?
In the LRT silesaurs are outgroup poposaurs, not related to dinosaurs.
Add more poposaurs to find this out for yourself.
In the LRT Dinosauria remains monophyletic.
“Heterodontosauridae is resolved as a clade of non-genasaurian ornithischians, rejecting a potential relationship with Marginocephalia.”
No mention of Daemonosaurus and Chilesaurus (Fig 1)?
No mention of Sauropodomorpha?
Figure 2. Tested taxa in the LRT nesting in the Phytodinosauria.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2022/01/phytodinosauria2022-588.jpg?w=88″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2022/01/phytodinosauria2022-588.jpg?w=299″ tabindex=”0″ role=”button” class=”size-full wp-image-64386″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2022/01/phytodinosauria2022-588.jpg” alt=”Figure 2. Tested taxa in the LRT nesting in the Phytodinosauria.” width=”584″ height=”1997″ />
Given these taxon exclusions,
apparently there’s no reason to continue with this abstract. The authors’ analysis is not ‘comprehensive’.
References
Fonseca AO et al. (5 co-authors) 2024. A comprehensive phylogenetic analysis on early ornithischian evolution. Journal of Systematic Palaeontology 22(1):Article: 2346577.
https://doi.org/10.1080/14772019.2024.2346577
Source: https://pterosaurheresies.wordpress.com/2024/06/23/ornithischia-2024/
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