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Pederpes gets the DGS treatment

Tuesday, February 7, 2017 11:26
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The first known basal tetrapod with a five-toed pes is
Pederpes finneyae (Clack 2002; Tournasian, early Carboniferous, 348mya; 1m in est. length) and it is known from a fairly complete articulated skeleton. In an attempt to reconstruct the skull I have colored elements (Fig. 1) and moved those tracings to a reconstruction (Fig. 2) in which some of the broken loose pieces have been replaced to their in vivo positions.

Figure 1. Pederpes in situ with elements colorized. See figure 2 for a reconstruction. ” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg?w=584&h=406?w=300″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg?w=584&h=406?w=584″ class=”size-full wp-image-25965″ src=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg?w=584&h=406″ alt=”Figure 1. Pederpes in situ with elements colorized. See figure 2 for a reconstruction. ” width=”584″ height=”406″ srcset=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg?w=584&h=406 584w, https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg?w=150&h=104 150w, https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg?w=300&h=209 300w, https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull_insitu588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 1. Pederpes in situ with elements colorized. See figure 2 for a reconstruction.

The lacrimal, maxilla and jugal
have broken parts that fit together like puzzle pieces.

Figure 2. Pederpes skull elements returned to their in vivo positions. ” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg?w=584&h=322?w=300″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg?w=584&h=322?w=584″ class=”size-full wp-image-25966″ src=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg?w=584&h=322″ alt=”Figure 2. Pederpes skull elements returned to their in vivo positions. ” width=”584″ height=”322″ srcset=”https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg?w=584&h=322 584w, https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg?w=150&h=83 150w, https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg?w=300&h=165 300w, https://pterosaurheresies.files.wordpress.com/2017/02/pederpes-skull-recon588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 2. Pederpes skull elements returned to their in vivo positions. Compare to figure 1. Skull roof is shown rotated to the picture plane, but in life would have been flat and seen edge-on. Yellow bone behind skull is a stapes.

In the large reptile tree
Pederpes nests between Ichthyostega and Whatcheeria + Crassigyrinus.

References
Clack JA 2002. An early tetrapod from ‘Romer’s Gap’. Nature. 418 (6893): 72–76.



Source: https://pterosaurheresies.wordpress.com/2017/02/08/pederpes-gets-the-dgs-treatment/

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