I have seen hybrids between Triturus cristatus and T. marmoratus in the wild's of Brittany. I also keep another naturally occurring intergrade of Salamandra, between S.s.gallaica/S.s.fastuosa.
Here's the link: http://www.caudata.org/forum/messages/985/7572.html?1068024835
I personally think that we tread dangerous water when producing 'mules', which could ruin the Species integrity all too easily. Look at the various, as yet undescribed forms of Tylototriton verrucosus for instance.
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