Hmm I agree. It does look more like a Pseudanthias Pascalus. It's interesting though because if you search Purple Queen Anthia in a typical search engine both Pseudanthias Pascalus and Pseudanthias Tuka come up as Purple Queen Anthias.
So I did some more digging and found a gold mine of info!
http://reefkeeping.com/issues/2006-12/hcs3/index.php
A few selected quotes for the less interested lol.
"The Queen Anthias - what an amazingly beautiful fish! It is a large Anthias, reaching nearly 7" in length as an adult. For those keeping track, ichthyologists and astute hobbyists refer to this species by its Latin name, Pseudanthias pascalus."
"Getting this fish to feed in captivity is a formidable task, however. Most specimens starve to death from refusing to eat, thereby making it a difficult species to keep and less than ideal for most hobbyists. Again, the one male to multiple females ratio is ideal, as well as providing several feedings per day. Among the female collective, try tossing in a few P. tuka, a closely-related species"
"One of my favorite Pseudanthias is the Purple Anthias, P. tuka (photos below). It is similar to P. pascalus, and the two species are easily confused. Pseudanthias tuka remains average-sized for Pseudanthias genus, not quite reaching 5"."
So I guess and correct me if I'm wrong, the Pascalus seems to be the true Purple Queen? But the Tuka is referred to as a Purple Anthia. Yet they are so closely related they can be interchanged as females in harem.
Still the question remains. Would I be pushing my luck to add females of either species (Pascalus or Tuka) to my current male? I wonder if new additions would be more apt to eat after seeing him eating? Or would it be possible to add more hardy anthias and leave him alone?
So be prepared to deal with the difficult norm for this species if you want to get more, IMO
