Robuta

https://www.sciencetimes.com/articles/43333/20230418/paleontology-mystery-solved-300-million-year-old-tully-monster-bones.htm
After subjecting specimens of the Tully monster to scans, the researchers found out that the creature was an invertebrate all along. Read to learn more.
mystery solvedmillion yeartully monsterpaleontologyold