Does anyone know what the common and scientific names of this snail are?? They look like MTS but with spikes. I have looked at the "Spike Tail Trumpet snail" (Melanoides granifera) on Snailshop's website but not convinced they are the same. Thanks 
Edit: Forgot to ask - do they cross-breed with the normal MTS?
Edit: Forgot to ask - do they cross-breed with the normal MTS?

/coryland.de/c01/news/nsn_thiara_winteri.html
Also saw some sites suggest that it's Melanoides granifera.
The guys in the LFS think that I'm mad wanting trumpet snails