[Thamnophis]

Crossing with infernalis is not a good idea. By the way, this gives nu hybrids, but integrades.

But next to that, there is òne official bloodline in Europe (that from Blijdorp Zoo who got them from Jersey Zoo on Guernsey) as far as I know.
The line from Austria seems to have never existed.

But... I am almost certain that there are tetrataenia´s illegally imported in the last twenty years ore so. I have no prove for this though...