Delorhynchus – getting closer to Eunotosaurus

A recent paper by Reisz et al. (2014) presented a large portion of the anterior skeleton of a specimen previously known from smaller scraps.

Figure 1. Delorhynchus compared to its closest sisters, Acleistorhinus and Eunotosaurus to scale.

Figure 1. Delorhynchus compared to its closest sisters, Acleistorhinus and Eunotosaurus to scale.

Delorhynchus cifelli (Reisz et al. 2014, Fig. 1) is an Early Permian terrestrial reptile from Oklahoma. Derived from a sister to AcleistorhinusDelorhynchus was basal to Eunotosaurus and was larger than both. The jugal had two posterior processes. The squamosal is largely unknown. No expanded ribs were found with this specimen.

Reisz et al. nested Delorhynchus with Lanthanosuchus and Acleistorhinus, but Lanthanosuchus nests with Macroleter in the large reptile tree here as we discussed earlier here.

References
Reisz RR, Macdougall MJ and Modesto S 2014. A new species of the parareptile genus Delorhynchus, based on articulated skeletal remains from Richards Spur, Lower Permian of Oklahoma. Journal of Vertebrate Paleontology 34:1033–1043.

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