The manus of Poposaurus revised — again

 

Revised April 23, 2014 based on further study. 

 Figure 1. Poposaurus manus as originally restored and with digit 1 switched to 5.


Figure 1. Poposaurus manus as originally restored and with digit 1 switched to 5. Note the resemblance to dinosaur and basal croc hands in this basal archosaur.

The manus of basal archosaurs is very rare.
What few clues we have indicate that metatarsals 1-3 aligned distally and digit 5 is a vestige. Revising the manus of Poposaurus to that pattern is demonstrated here (Fig. 1).

References
Gauthier JA, Nesbitt SJ, Schachner ER, Bever GS and Joyce WG 2011. The bipedal stem crocodilian Poposaurus gracilis: inferring function in fossils and innovation in archosaur locomotion. Bulletin of the Peabody Museum of Natural History 52:107-126.
Mehl MG 1915. Poposaurus gracilis, a new reptile from the Triassic of Wyoming. Journal of Geology 23:516–522.

wiki/Poposaurus

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