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When pterosaurs walked: PBS Eons video

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More pterosaur myths promoted by PBS on YouTube.
We need to clear this up with footprints, reconstructions and overlooked citations.

The following was copied from YouTube comments section:
Several traditional mistakes here: Pterosaurs are lepidosaurs when tested with more that just archosaurs. That’s why they have splayed knees (align the axis of the acetabulum with the axis of the femoral head), a single sternum melded to the interclavicle and clavicles, a long fourth finger and toe five is really long (in basal taxa). Plus they have leathery eggs.

We know of digitigrade and plantigrade pterosaur tracks. Bipedal and quadrupedal. Pterosaur tracks can be matched to trackmakers because each species has a unique foot. Peters 2011: A catalog of pterosaur pedes for trackmaker identification. Ichnos 18:114-141.

That backward pointing portion of the hand track is the third short finger. The wing never makes an impression. Only lepidosaurs have a ball on ball joint on knuckle #3 that permits and encourages that backwards splay… one more reason pterosaurs are lepidosaurs, not archosaurs.

That pterosaur ‘nesting site’ was created by outgassing of a nearby lake that killed pregnant females carrying less than full term eggs. After desiccation and disarticulation, during a later wet season, the floating dried up eggs were swirled together apart from the skeletal remains.

You can see an animation of a Pterodactylus walking (Fig. 4) over matching tracks from Crayssac, France by googling “pterodacwalk60”. Compare it to a competing animation “bennettpterodac-walk” also online (Fig. 5).


Figure 6. Pteranodon walking animation. The forelimbs were so large, they were used only when not walking.

Figure 8. Quetzalcoatlus had a different morphology as a stork-like wader. Here balance was always a consideration.

References
Bennett SC 1997. Terrestrial locomotion of pterosaurs: a reconstruction based on Pteraichnus trackways. Journal of Vertebrate Paleontology, 17: 104–113. online pdf
Padian K 1983. Osteology and functional morphology of Dimorphodon macronyx (Buckland) (Pterosauria: Rhamphorhynchoidea) based on new material in the Yale Peabody Museum, Postilla, 189: 1-44.
Peters D 2000a. Description and Interpretation of Interphalangeal Lines in Tetrapods.  Ichnos 7:11-41.
Peters D. 2010. In defence of parallel interphalangeal lines. Historical Biology 22:437-442.
Peters David 2011. A Catalog of Pterosaur Pedes for Trackmaker Identification. Ichnos, 18: 2, 114 —141.
Peters D 2011. A Catalog of Pterosaur Pedes for Trackmaker Identification Ichnos 18(2):114-141. http://dx.doi.org/10.1080/10420940.2011.573605 ResearchGate.net


Source: https://pterosaurheresies.wordpress.com/2021/12/18/when-pterosaurs-walked-pbs-eons-video/


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