A new paper:
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The Pennsylvanian tetrapod Macrerpeton huxleyi is known by a fairly complete skull from the Diamond coal mine at Linton (Ohio, USA) and a range of further specimens from the type and other localities. It was a medium-sized dissorophoid temnospondyl with a highly aberrant cranial morphology, combining a slender skull, tiny marginally placed orbits, a wide skull table and enlarged snout. The premaxilla is larger than the maxilla. The posterior skull table is slender and elongate, the tabular bears a prominent horn, the choana is minute and located close to the interpterygoid vacuity, the vomer and palatine have large dentigerous areas, and the parasphenoid bears a wide Aâshaped denticle field and extended basipterygoid rami. The quadratojugal and ectopterygoid remain unknown. Macrerpeton is found to nest within the stem-group of dissorophoids, having plesiomorphic characters consistent with trimerorhachids and zatracheids, but sharing some cranial synapomorphies with Dissorophoidea proper.
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