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Dinosaur snack, Sinobaatar, enters the LRT

Friday, April 26, 2024 14:09

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Several specimens
of tiny (mouse-to-rat-sized Sinobaatar created this generic chimaera (Figs 1 –3) with close affinities to chipmunk-sized Rugosodon.

Figure 1. Sinobaatar in situ. DGS colors and reconstuctions added here. ” data-image-caption=”

Figure 1. Sinobaatar in situ. DGS colors and reconstuctions added here.

” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg?w=211″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg?w=584″ class=”size-full wp-image-85601″ src=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg?w=584&h=830″ alt=”Figure 1. Sinobaatar in situ. DGS colors and reconstuctions added here.” width=”584″ height=”830″ srcset=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg?w=584&h=830 584w, https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg?w=106&h=150 106w, https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg?w=211&h=300 211w, https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar_insitu588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 1. Sinobaatar in situ. DGS colors and reconstuctions added here.

The canine might be missing or absent.
The premolars and molars are shaped like those in Rugosodon. As in rodents, the jugal is not exposed laterally.

Figure 2. Skull of Sinobaatar from two specimens. DGS colors added here. ” data-image-caption=”

Figure 2. Skull of Sinobaatar from two specimens. DGS colors added here.

” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg?w=300″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg?w=584″ class=”size-full wp-image-85599″ src=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg?w=584&h=557″ alt=”Figure 2. Skull of Sinobaatar from two specimens. DGS colors added here. ” width=”584″ height=”557″ srcset=”https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg?w=584&h=557 584w, https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg?w=150&h=143 150w, https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg?w=300&h=286 300w, https://pterosaurheresies.files.wordpress.com/2024/04/sinobaatar-skullctscan588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 2. Skull of Sinobaatar from two specimens. DGS colors added here. This skull is compressed and torsioned. See Rugosodon for in vivo shapes.

This clade of multituberculates
nests between extant tree shrews + aye-ayes (Daubentonia) and extant rodents in the LRT.

Figure 3. An old chart of multituberculate skulls to scale. Sinobaatar added here. ” data-image-caption=”

Figure 3. An old chart of multituberculate skulls to scale. Sinobaatar added here.

” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg?w=106″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg?w=363″ class=”size-full wp-image-85602″ src=”https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg?w=584&h=1648″ alt=”Figure 3. An old chart of multituberculate skulls to scale. Sinobaatar added here. ” width=”584″ height=”1648″ srcset=”https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg?w=584&h=1648 584w, https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg?w=53&h=150 53w, https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg?w=106&h=300 106w, https://pterosaurheresies.files.wordpress.com/2024/04/multituberculates2scale588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 3. An old chart of multituberculate skulls to scale. Sinobaatar added here.

Sinobaatar lingyuanensis
(Hu and Wang 2002, Early Cretaceous) is a small multituberculate close to Rugosodon (Fig 4). Several specimens are known. One mandible was found inside the belly of the theropod we looked at yesterday, GMV2124. So small size did not protect all Mesozoic mammals.

Rugosodon eurasiaticus (Yuan et al. 2013, Late Jurassic, the size of a chimpmunk) is the oldest multituberculate and it is represented by a complete skeleton. Teeth and ankle evidence indicate it was an omnivore and arboreal. ” data-image-caption=”

” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg?w=300″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg?w=584″ class=”size-full wp-image-34869″ src=”https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg?w=584&h=459″ alt=”Rugosodon eurasiaticus (Yuan et al. 2013, Late Jurassic, the size of a chimpmunk) is the oldest multituberculate and it is represented by a complete skeleton. Teeth and ankle evidence indicate it was an omnivore and arboreal.” width=”584″ height=”459″ srcset=”https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg?w=584&h=459 584w, https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg?w=150&h=118 150w, https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg?w=300&h=236 300w, https://pterosaurheresies.files.wordpress.com/2018/12/rugosodon_recon588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 4. Rugosodon eurasiaticus (Yuan et al. 2013, Late Jurassic, the size of a chimpmunk) is the oldest multituberculate and it is represented by a complete skeleton. Teeth and ankle evidence indicate it was an omnivore and arboreal.

Traditionally
multituberculates are considered pre-monotremes = pre-mammals due to the primitive structure of the posterior mandible bones. This is a reversal in this placental based on the sliding jaw joint interfering with normal ontogenetic development of the tiny middle ear bones otherwise transformed during phylogeny and ontogeny from posterior jaw bones.

References
Hu Y Wang YQ 2002. Sinobaatar gen nov: First multituberculate from the Jehol Biota of Liaoning, Northeast China. Chinese Science Bulletin 47(11): 933–938.

wiki/Rugosodon
wiki/Xianshou
wiki/Sinobaatar

Source: https://pterosaurheresies.wordpress.com/2024/04/27/dinosaur-snack-sinobaatar-enters-the-lrt/

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