svp abstracts of interest or bombast 2024: R–T
It is abstract season.
Here are selected sentences from selected abstracts from SVP 2024 – Minneapolis:
Figure 3. Hemiprotosuhus image from Desojo and Ezccura 2016. Colors added. This taxon is derived from Ticinosuchus, basal to aetosaurs.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2019/11/aetosaurus-ticinosuchus588.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2019/11/aetosaurus-ticinosuchus588.jpg?w=584″ class=”size-full wp-image-40402″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2019/11/aetosaurus-ticinosuchus588.jpg” alt=”Figure 3. Hemiprotosuhus image from Desojo and Ezccura 2016. Colors added. This taxon is derived from Ticinosuchus, basal to aetosaurs.” width=”584″ height=”572″ />
Figure 1. Hemiprotosuhus image from Desojo and Ezccura 2016. Colors added. This taxon is derived from Ticinosuchus, basal to aetosaurs.
Reyes W and Brown M: Triassic babies? A cluster of small-bodied aetosaurs from the Upper Triassic Dockum Group (Otischalkian – latest Carnian?) of Texas.
“This cluster preserves at least three individuals, including a 3-dimensionally well-preserved
skull and two partial skeletons. Aetosaurs exhibited a well ossified carapace early in their
development, suggesting that their osteoderms may have been partially ossified
to some degree at birth, which is unlike the condition observed in extant crocodilians.”
Babies are always delightful news.
Unfortunately the authors consider aeotosaurs archosaurs. The LRT restricts Archosauria to just dinos + crocs, because they defining clades and they are sister clades in the LRT. Poposauria is the outgroup.
Figure 1. Taxa in the lineage of Tyrannosaurus from Compsognathus. Fukuivenator is a transitional taxon in this lineage, nesting with Tianyuraptor. These taxa indicate an East Asian origin for this clade.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2023/06/zhenyuanlong_vs_compsognathus.jpg?w=98″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2023/06/zhenyuanlong_vs_compsognathus.jpg?w=335″ class=”wp-image-79016 size-full” src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2023/06/zhenyuanlong_vs_compsognathus.jpg” alt=”Figure 1. Taxa in the lineage of Tyrannosaurus from Compsognathus. Fukuivenator is a transitional taxon in this lineage, nesting with Tianyuraptor. These taxa indicate an East Asian origin for this clade.” width=”584″ height=”1788″ />
Figure 1. Taxa in the lineage of Tyrannosaurus from Compsognathus. Fukuivenator is a transitional taxon in this lineage, nesting with Tianyuraptor. These taxa indicate an East Asian origin for this clade.
Schirrmacher KW et al: Use of musculoskeletal models to estimate optimal postures and potential functions of tyrannosaur forelimbs.
“The summed moment arms in the Tyrannosaurus shoulder were overall positive, indicating an emphasis on protraction, elevation, and internal rotation, and the joint was most effective when held in a highly protracted and elevated position. At the elbow, flexion and pronation were emphasized, and the joint would have been most effective when flexed and pronated.”
“We then repeated the entire process for Guanlong wucaii, a Late Jurassic tyrannosauroid. Unlike Tyrannosaurus, it had long, gracile forelimbs, a stark contrast that points to functional differences and evolutionary change. The Guanlong shoulder showed largely opposite trends from the Tyrannosaurus shoulder, and was most effective when held in a depressed and retracted position.”
In the LRT Guanlong (Fig 3) was basal to long-snouted spinosaurs. Early Cretaceous, winged Zhenyuanlong (Fig 2) was basal to Tyrannosaurus (Fig 2). So that means T-rex had vestigial wings, different from Guanlong, which never had wings.
Figure 1. Guanlong reconstructed by moving elements tracing Xu et al. 2006.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2015/12/guanlong588.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2015/12/guanlong588.jpg?w=584″ class=”size-full wp-image-21388″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2015/12/guanlong588.jpg” alt=”Figure 1. Guanlong reconstructed by moving elements tracing Xu et al. 2006.” width=”584″ height=”421″ />
Figure 3. Guanlong reconstructed by moving elements tracing Xu et al. 2006.
On a similar note…
Sereno PC et al: Scimitar-crested species of Spinosaurus discovered in riparian habitat in Niger (Farak Formation, Cenomanian).
“the median nasal crest. In the new species, it rises posterodorsally as a solid, scimitar-shaped process. In lateral view, the crest equals in height the depth of the cranium below it.”
Such a medial crest is comparable to an LRT spinosaur ancestor, Guanlong (Fig 3).
Figure 4. Aspidorhynchus compared to Saurichthys.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/saurichthys588.jpg?w=210″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/saurichthys588.jpg?w=584″ class=”size-full wp-image-89592″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/saurichthys588.jpg” alt=”Figure 4. Aspidorhynchus compared to Saurichthys.” width=”584″ height=”833″ />
Figure 4. Aspidorhynchus compared to Saurichthys.
Stack J et al: A new occurrence of Saurichthys (Actinopterygii) from the Dockum Group of Texas (Late Triassic, Norian) highlights the uneven tempo of the appearance of specialized jaw morphologies in ray-finned fishes.
“Previous phylogenetic and paleoecological study of Saurichthys indicate its position outside the actinopterygian crown group and its morphological convergence on living rayfinned fishes with lengthened jaws and fast bites.”
In the LRT Saurichthys is the most derived member of the Pachycormiformes, close to Protosphyraena and Aspidorhynchus (Fig 4). All are now extinct.
Figure 8. Gray whale (Eschirctius) anterior rostrum. Green arrow points to the canine alveolus lacking a tooth. Missing mandible teeth would have appeared along anterior rims of the mandibles (blue arrow), as in desmostylians.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2016/11/gray-whale-tooth_sockets588.jpg?w=271″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2016/11/gray-whale-tooth_sockets588.jpg?w=584″ class=”size-full wp-image-25060″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2016/11/gray-whale-tooth_sockets588.jpg” alt=”Figure 8. Gray whale (Eschirctius) anterior rostrum. Green arrow points to the canine alveolus lacking a tooth. Missing mandible teeth would have appeared along anterior rims of the mandibles (blue arrow), as in desmostylians.” width=”584″ height=”648″ />
Figure 5. Gray whale (Eschirctius) anterior rostrum. Green arrow points to the canine alveolus lacking a tooth. Missing mandible teeth would have appeared along anterior rims of the mandibles (blue arrow), as in desmostylians. Here the mandibles do not have symphyseal fusion, as seen in odontocetes.
Strauch R and Peredo CM: To fuse or not to fuse: drivers of symphyseal fusion in whales.
“Odontocetes repeatedly evolve extreme fusion and elongation, whereas mysticetes
have evolved unfused mandibles with no bony connection.”
That’s because odontocetes are not related to mysticetes in the LRT and…
Figure 8. Common bottle nose dolphin skull (genus: Tursiops) also displays a bit of asymmetry in dorsal view.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2018/03/tursiops_skull588.gif?w=191″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2018/03/tursiops_skull588.gif?w=584″ class=”size-full wp-image-30196″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2018/03/tursiops_skull588.gif” alt=”Figure 8. Common bottle nose dolphin skull (genus: Tursiops) also displays a bit of asymmetry in dorsal view.” width=”584″ height=”916″ />
Figure 6. Common bottle nose dolphin skull (genus: Tursiops) also displays a bit of asymmetry in dorsal view. Note the lack of mandible fusion.
…it is notable that the dolphin Tursiops (Fig 6) does not exhibit much, if any, mandible fusion or extreme fusion, which might result after elongation.
On the other hand, the Amazon river dolphin, Inia (Fig 7), does show extreme fusion after elongation. Extinct Zygorhiza (Fig 7) might demonstrate mandibular fusion, but with a narrow or wide valley between the mandibles. A ventral view was not found.
Figure 6. Jaw symphysis in extant Inia, less so in two extinct Zygorhiza specimens.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/zygorhiza.jaw_.symphysis.jpg?w=111″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/zygorhiza.jaw_.symphysis.jpg?w=380″ class=”size-full wp-image-89600″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/zygorhiza.jaw_.symphysis.jpg” alt=”Figure 6. Jaw symphysis in extant Inia, less so in two extinct Zygorhiza specimens.” width=”584″ height=”1573″ />
Figure 7. Jaw symphysis in extant Inia, less so in two extinct Zygorhiza specimens.
Source: https://pterosaurheresies.wordpress.com/2024/11/05/svp-abstracts-of-interest-or-bombast-2024-r-t/
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