IsYoungolepisa porolepiform?

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Abstract
The histology and morphology of Youngolepis, Powichthys, and Diabolepis are reviewed. Four characters are chosen to support the sister-group relationship between Youngolepis and Powichthys, independent from the characters shared by both genera and other groups. These four are: long extension of the anterior cranial division; absence of the suprapterygoid process; tooth patch along the lateral portions of the palate and lower jaw; and otic process with structures related to it. The group comprising Youngolepis and Powichthys, in turn, is referred to the Porolepiformes, rather than to Diabolepis + dipnoans. This is based on an analysis of characters that shows that Youngolepis and Powichthys share with porolepiforms 12 characters, among which five are shared uniquely, while they share eight characters with Diabolepis, including two that are shared uniquely, three are also shared by dipnoans, and five by porolepiforms. The possibility remains that, with an increase in information, this conclusion might be reversed.