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Dendrerpeton gets the DGS treatment

Tuesday, January 31, 2017 10:22

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Figure 1. GIF movie of Dendrepeton fossil in situ showing original interpretation with intertemporal and contact of the prefrontal and postfrontal. Below: DGS tracing and new interpretation without the intertemporal and prefrontal/postfrontal contact. Fossil images from Holmes et al. 1998.

Dendrerpeton acadianum (Owen 1853; Holmes, Carroll and Reisz 1998; Bashkirian, Carboniferous ~318 mya; ~10 cm in length; YPM VP 005895, BMNH R4158, RM 2.1121) was derived from a sister to Amphibamus and phylogenetically preceded Acheloma and Cacops in the large reptile tree (LRT).

Figure 2. Dendrerpeton without raised orbits from Holmes et al. 1998. These authors had firsthand access to the specimen, yet missed several details revealed by second hand access to published photos.

Overall larger than Amphibamus,
the skull of Dendrerpeton was narrower, the rostrum longer, the nares more widely separated. The skull bones were highly sculptured.

Distinct from earlier interpretations
by Holmes, et al. 1998 (Figs. 1,2), the orbit of Dendrerpeton was raised above the skull roof, the prefrontal did not contact the postfrontal, the palatine was exposed laterally and the intertemporal was not present. These authors had firsthand access to the specimen, yet missed several details revealed by second hand access to published photos. DGS reveals where the puzzle pieces are simply by coloring them to segregate them, and trying the puzzle pieces until they fit.

At present these traits
nest Dendrerpeton close to Tersomius (Fig. 3) within the Lepospondyli.

Figure 3. Tersomius texensis, an amphibamid lepospondyl close to Dendrerpeton. DGS colors have been applied over several bones.

References
Case EC 1910. New or little known reptiles and amphibians from thePermian (?) of Texas. Bulletin of the American Museum of Natural History 28, 163–181.
Holmes RB, Carroll RL and Reisz RR 1998. The first articulated skeleton of Dendrerpeton acadianum (Temnospondyli, Dendrerpetontidae) from the lower Pennsylvanian locality of Joggins, Nova Scotia, and a review of its relationships. Journal of Vertebrate Paleontology 18:64-79.
Maddin H, Fröbisch NB, Evans DC and Milner AR 2013. Reappraisal of the Early Permian amphibamid Tersomius texensis and some referred material. Comptes Rendus Palevol 12:447-461.
Moodie RL 1916. Journal of The coal measures Amphibia of North America. Carnegie Institution of Washington #238. 222 pp.
Owen R 1853. Notes on the above-described fossil remains. Quarterly Journal of the Geological Society of London 9:66-67
Wyman J 1857. On a batrachian reptile from the coal formation. Proceedings of the American Association for the Advancement of Science, 10th Meeting, 172-173.

wiki/Dendrerpeton
wiki/Tersomius

Source: https://pterosaurheresies.wordpress.com/2017/01/31/dendrerpeton-gets-the-dgs-treatment/

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