Could I con you into possibly taking a comparison photo of one of your hybrids with a wildtype Mexicanum and a full blood Andersoni?
The photos are pretty evident, but for someone that doesn't have Andersoni, like you said, it would be very easy to dupe them.
Since the webbing, tail, and pattern/color difference might not be evident to them.
I have a friend in NV that has 2 pet axolotls (sisters) that have the chubby body of an Andersoni, I hadn't thought to look at webbing. Color differences are so wide in A.Mexicanum that I didn't take that into account either. Though their coloring is not the "usual" wildtype, and one is a melanoid.
I personally am not opposed to hybrids, A.Mexicanum has been hybridized before, given GFP and the tote on the xanthic gene.
I do agree with you that they should only go to people that aren't going to use them just to pawn off "AnderPhonies". Or people that aren't just going to blithely breed them into established populace of either Original species without labeling them as hybrids.