Lo is an outdated genus that is no longer used. Now the fox faced rabbit fish (spots or no spots) are both in the genus Siganus. There is a debate among taxonomists and biologists as to whether or not the two are even separate species as they reach the same size, have the same habits, and can successfully interbreed. Despite what is commonly said, the spot is the only verifiable difference at this time. Remember, a very short time ago, even the experts believed bristle worms were bad. Now we know that they are among the most beneficial organisms one can have in a tank. Science is always progressing, and as genetic testing becomes more widespread, many species are being reclassified. Just as many "facts" are being recognized as myths.
Just sayin.