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I'm not sure where is the best place to post this. Feel free to move it, if there is a more appropriate place. It seems to me Philosepedon and Quatiella are quite similar, the main difference being which side of the pond they are in/on. Are there any specific differences that differentiate them other than location?

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I am not a taxonomist, so I don't know. But they definitely look the same.

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The genus Quatiella was already considered a subgenus and a synonym of Philosepedon Eaton, 1904 by Duckhouse (1973, 1974, respectively), but was accepted as a genus by others (Vaillant, 1973, 1974, 1990, 1991; Ježek, 1985; Wagner & Masteller, 1996; Ibánez-Bernal, 2004).

From https://www.resea...pecies.pdf

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This article https://www.biota...view/17549 goes into some detail of the various differences.

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"The male genitalia are quite different" says an expert.

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Yeah, the last link I gave goes into some detail, for which there is disagreement among the named experts.