More on Sinopterus liui

Yesterday we looked at a new specimen (IVPP V14188) attributed to Sinopterus liui by Meng (2015). Today we’ll take a closer look at the pectoral girdle, pelvic girdle and pes.

Figure 1. Sinopterus liui pectoral region with bones colorized using DGS. Note the sternal cristospine (lavender) has apparently broken off from the sternal shield. This is a dorsal view, but look at figure 2.

Figure 1. Sinopterus liui pectoral region with bones colorized using DGS. Note the sternal cristospine (lavender) has apparently broken off from the sternal shield. This is a dorsal view, but look at figure 2.

Sometimes its just easier
to see the bones when they are colorized. Many paleontologists use this technique. I’d like to see the method used more often.

Figure 2. Sinopterus liui pelvic region and hind limb colorized and reconstructed using DGS. While the pectoral region is exposed in dorsal view, the placement of metatarsal 1 on top here indicates a ventral view. The fibula is underneath the tibia here. We're also seeing the ventral distal femur.

Figure 2. Sinopterus liui pelvic region and hind limb colorized and reconstructed using DGS. While the pectoral region is exposed in dorsal view, the placement of metatarsal 1 on top here indicates a ventral view. The fibula is underneath the tibia here. We’re also seeing the ventral distal femur.

With just a few more parts accurately traced
this specimen can be added to a phylogenetic analysis to see where it nests.

References
Meng X 2015. A New Species of Sinopterus from Jehol Biota and Reconstraction of Stratigraphic Sequence of the Jiufotang Formation. A Thesis for the Master Degree of Science in the Graduate School of Chinese Academy of Sciences, directed by Wang X-L. (in Chinese)

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