Tridentinosaurus antiquus (1931) from early Permian in the Alps has now
been discovered not to represent remarkable soft-tissue preservation,
but is mainly painted. However, under the paint there are a few poorly
preserved bones, so it is, in a fossil. The new paper concludes with
"Modern tomographic methods might reveal novel information about the
preserved skeleton but, until then, we suggest caution in using T.
antiquus in phylogenetic studies." "Caution" is the word for it.
https://onlinelibrary.wiley.com/doi/10.1111/pala.12690