Other scientists who have studied the monster said they are glad that the new study is drawing attention from the scientific world back to Tully.
"It is important to remember that this is how science works," said James Lamsdell, an assistant professor of paleobiology at West Virginia University, who also co-authored the March 2016 study calling the Tully monster a vertebrate. "It is natural for new ideas, based off new information, to be questioned by the scientific community. This back-and-forth drives research, and further studies will continue to test the position of the Tully monster among the vertebrates."
However, the authors of the new study "do not present any new information, nor do they restudy the specimens," Lamsdell told Live Science in an email. "As such, no convincing alternatives are presented for where this strange animal fits on the tree of life."
That idea was seconded by Jakob Vinther, a senior lecturer of macroevolution at the University of Bristol in the United Kingdom, who co-wrote the April 2016 study, and called the new study "a bit of a dog's breakfast" (in other words, a mess).