I know there's B. Falx, B. Imbellis, B. Malachai (sp?), and some others... in the labyrinth fish profiles there are some more. I believe that the other species aren't as colorful as B. Splendens, though I could be wrong.
mmm some nice fish! love the imbellis. now i see why someone commented that my male pk looks like an imbellis. but the pics of the b.splendens on that site are almost identical to my pk