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.
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Wikipedia: Tullimonstrum
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Tullimonstrum, colloquially known as the Tully monster or sometimes Tully's monster, is an extinct genus of soft-bodied bilaterian marine animal that lived in shallow tropical coastal waters of muddy estuaries during the Pennsylvanian, about 310 million years ago.
Wikipedia: Typhloesus
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Typhloesus wellsi is an extinct species of enigmatic bilaterian animals from the Bear Gulch Limestone, United States.
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