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D3072: Not another Sinopterus dongi. A more complete relative of headless Wenupteryx and SMNS PAL 3830

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Shen et al. 2021 present
“a new postcranial specimen, D3072, which we attribute to the type-species of the genus, Sinopterus dongi.”

No phylogenetic analysis
was provided by Shen et al.

After DGS tracing and phylogenetic testing
in the large pterosaur tree, (LPT, 261 taxa) the D3072 specimen (Early Cretaceous China) nests in the Germanodactylus (Late Jurassic Germany) grade with similar-sized, but also headless, Wenupteryx (Fig. 2, Late Jurassic Patagonia) and a much larger, though far less complete specimen, PAL SMNS 3830 (Fig. 2, Early Cretaceous Brazil), known for its long curving claws.

Shen et al. did not mention Wenupteryx.
This nesting documents this subclade of germanodactylids was worldwide in distribution.

The left metacarpal 4 was axially rotated during taophonomy
(Fig. 5) so the posterior side is exposed alongside the ulna hiding the radius beneath it. Metacarpals 1, 2 and 3 show displacement due to that axial rotation. Vestigial digit 5 was originally mistaken for the proximal end of metacarpal 1. So, they are seeing it, just misidentifying it.

The D3072 specimen further illuminates
this often forgotten clade of germanodactylid pterosaurs. The LPT tree topology did not change to accomodate the D3072 specimen. That’s a good sign that the LPT is doing it’s job. Taxon exclusion continues to be the number one problem in paleontology, case in point: Shen et al. 2021.

D3072
(Shen et al. 2021; Early Creaceous was originally considered a tapejarid. Here it nests with the incomplete SMNK PAL 3830 specimen and
Wenupteryx, all three nesting within the Germanodactylus grade several nodes apart from Sinopterus.

SMNK PAL 3830
(the Crato “azhdarchid” Frey & Tischlinger 2000; Early Cretaceous) was originally considered an azhdarchid, like Quetzalcoatlus. Here it nests as as sister to Germanodactylus cristatus, No. 61. Distinct from and twice the size of No. 61, fingers I-III of PAL 3830 were larger. Manual digit III was longer than half the metacarpus and as long as the entire foot. The metacarpus was much more robust than manual 4.1. The foot, while appearing quite lethal, was actually much smaller, about a third of the tibia. A small patella was present. The penultimate pedal phalanges were the longest in each series suggestive of an arboreal habitat when not flying.

References
Frey E and Tischlinger H 2000. Weichteilanatomie der Flugsaurierfüße und Bau der Scheitelkämme: Neue Pterosaurierfunde aus den Solnhofener Schichten (Bayern) und der Crato-Formation (Brasilien). Archaeopteryx, Eichstätt, 18: 1-16.
Shen C, Pêgas RV, Gao C, Kundrát M, Zhang L, Wei X and Zhou X 2021. A new specimen of Sinopterus dongi (Pterosauria, Tapejaridae) from the Jiufotang Formation (Early Cretaceous, China). PeerJ 9:e12360 http://doi.org/10.7717/peerj.12360

The family tree of the Pterosauria is here.

SMNK PA 3830 – not yet posted or named
D3072 – not yet posted and misidentified


Source: https://pterosaurheresies.wordpress.com/2021/11/14/d3072-not-another-sinopterus-dongi-a-more-complete-relative-of-headless-wenupteryx-and-smns-pal-3830/


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