So, now we know how to deal with one form of anisotropic opacity. But what about the specular effects?

Strangely, while Poser should have but does not have an anisotropic opacity node, it does have an anisotropic specular node. It is aptly named Anisotropic and found in the Specular branch of nodes.

I add one like this.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)