Yea, but I don't really see that as a boss like the other two are. I guess you could count him if you want to tho. The slug boss is kind of a joke if you ask me. I wouldn't know he was a boss or something if that wasn't half of his name.
eh the trophy you get is for killing the slug BOSS. but im my opinion all 3 were easy, there are times i didnt get hit at all with either of them, plus the final fight was a lil too short for me >< but for enemys theres the naked necros mining necros female necros super necros leapers super leapers lurkers super lurkers gaurdians (and whatever they spit out) brutes super brute pregnant necro (and what ever they spew out) naked dividers clothed dividers regeneraters stasis necros the giant worms kamakazies bat necros (that make super necros) those are the ones i can think of atm, there is no real difference in clothes or unclothed tho, at least i dont think >.>