Did you know fantastic help is an anagram of Planet Catfish? This forum is for those of you with pictures of your catfish who are looking for help identifying them. There are many here to help and a firm ID is the first step towards keeping your catfish in the best conditions.
It could be L 71/181/249 (they're all the same species). They are probably the most common. But there are several species of black ancistrus with white spots. I don't think it's L 120/182 or sp. Rio Ucayali, as they are more brown with orange spots. L183 it most certainly is not. Neither is it L 107/184. As to the rest, I can't say.