All Enigmatic Bilaterian Fossil Genera

Enigmatic Bilaterian Fossil Genera is a Browse By group of the Nature Atlas that gathers genera known from fossils of soft-bodied bilaterian animals whose place in the animal family tree is still debated, such as Tullimonstrum, the Tully monster of Illinois, and Typhloesus, the animal first mistaken for a conodont. An entry belongs here when its own cited article describes the genus as an enigmatic or controversially classified bilaterian. It excludes fossils placed firmly in a living group and problematic fossils that are not bilaterian animals. The group collects fossils that have been compared with mollusks, worms and early vertebrates, so a reader can follow how scientists have argued about what these animals were.