Gondwanax paraisensis does not enter the LRT
Müller 2024 described an incomplete skeleton
“Gondwanax paraisensis gen. et sp. nov is the oldest “silesaurid” with three sacral vertebrae, a feature usually observed in more derived forms.”
By contrast, in the large reptile tree (LRT, 2327 taxa) Silesaurus (Fig 1) nests among the Poposauria, the outgroup to the Archosauria = crocs + dinos only. These other taxa rarely appear in silesaurus cladograms, including the one published in Müller 2024.
By contrast, in the LRT all the poposaurs have three sacral vertebrae.
Gondwanax (CAPPA/UFSM 0417) est 1m long is incomplete and will not enter the LRT.
Figure 1. Poposauridae revised for 2014. Here they are derived from Turfanosuchus at the base of the Archosauria, just before crocs split from dinos.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg?w=239″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg?w=584″ class=”size-full wp-image-15680″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg” alt=”Figure 1. Poposauridae revised for 2014. Here they are derived from Turfanosuchus at the base of the Archosauria, just before crocs split from dinos.” width=”584″ height=”733″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg?w=584&h=733 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg?w=120&h=150 120w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg?w=239&h=300 239w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2014/04/poposauridae2014-588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. Poposauridae revised for 2014. Here they are derived from Turfanosuchus at the base of the Archosauria, just before crocs split from dinos.
From the Müller 2024 abstract
“Whereas some hypotheses place these archosaurs as the sister-group to dinosaurs, others suggest that “silesaurids” are early ornithischian dinosaurs. Despite the phylogenetic disputes, “silesaurids” are a crucial group for comprehending the origins and early evolution of dinosaurs.”
Not that crucial. More crucial are the basal bipedal crocodylomorphs that rarely make it to dinosaur origin cladograms. Also, why are Turfanosuchus and Poposaurus (Fig 1) so often omitted?
It is so important to nest your taxon correctly in a wide gamut cladogram that minimizes taxon exclusion.
References
Müller RT 2024. A new “silesaurid” from the oldest dinosauromorph-bearing beds of South America provides insights into the early evolution of bird-line archosaurs. Gondwana Research (in press). doi:10.1016/j.gr.2024.09.007
Publicity
novataxa.blogspot.com/2024/10/gondwanax.html
sci.news/paleontology/gondwanax-paraisensis-13310.html
Source: https://pterosaurheresies.wordpress.com/2024/11/22/gondwanax-paraisensis-does-not-enter-the-lrt/
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