I recently read in a article that Jack Horner, along with colleagues Campione and Evans, was continuing to try to prove his hypothesis in the lumping/splitting debate. I new his ideas about how Nedoceratops and Torosaurus could be growth stages of Triceratops( the same with Pachycephalosaurus, Stygimoloch, and Dracorex), but now his colleagues have concluded with there anatomical comparisons of skulls of Anatotitan, Thespesius, and Edmontosaurus. They stated that they were different growth stages of Edmontosaurus( Anatotitan being an adult version of Edmontosaurus annectens and Thespesius being a young adult of E.regalis).
This is where the problem for me begins
. If you know anything about Jack Horner he has been recently famous for his ideas of morphing and lumping different dinosaur genus's saying there the same animals. In fact, Wikipedia seems to support him by removing Anatotitan from there data site( just check it out yourself). Now if you know me Anatotian is one of my favorite Hadrosaurs and the fact that he thinks that it is the same animal as Edmontosaurus is just annyoing. In my opinion I think there is enough anatomical differences between the two to keep them seperate. If you noticed Jack Horner's theories for Anatotitan's distinctive looks changed. At first he stated that the skull of Anatotian was crushed by pressure during fossilization, then he said that it is a mature form of Edmontosaurus annectens. If this proves to be true then threw the rules of ICZN( the law that governs animal naming) will sink Anatotitan altogehter. I do not support this theory or any other theory of Horner's in the case of lumping different dinosaur species. I hope I get more support and hopefully keeep Anatotitan's name ALIVE!!!