Agree with Ryan, don't know that it's a rule but it seem lfs "surinamensis" often turn out to be altifrons or abalios and in altifrons I'd expect a smaller black spot, making abalios a default guess for me-- and it looks like it could be. That said, at that size several species look similar and surprises happen. Someone who's bred a certain species might distinguish them at a small size, otherwise you probably won't know for a while.