Is Arachnis part of the Vanda Alliance?

[Rosiefuture]

Hi, I was wondering if Arachnis (spider or scorpion orchid) is part of the Vanda alliance.

I've had a couple of these orchids for a few years but they never flower. I'm in Western Australia and we have long hot and dry summers and cool, fairly wet winters. Does anyone have some growing tips that might help me get them to bloom?

Thanks
Marion