Well,at this point I am or I wouldn't have posted but I could be wrong of course.I have based my conclusion on the many different photos of the two fish that I have seen and compared .Are you sure about your id? This doesn't really look like any picture of dorsalis I've seen. The head seems to differ from the planet catfish photos.
It looks like a megalodoras to myself.
I did as that is actually what I bought it as but it's markings indicated differently to me....worse comes to worse I'm still all in with this fish and my long search for a litho continues.People can make mistakes, but Rapps has a great reputation and wouldn't knowingly misrepresent a fish. I would suggest contacting him and ask him to read this thread and add his 2 cents. I hope you paid uranoscoups price.