Ordovician Problematic Fossil Genera

Ordovician Problematic Fossil Genera is a Browse By group of the Nature Atlas that gathers fossil genera from the Ordovician period whose biological identity is disputed or unknown, such as Cestites, a single-species fossil from the Middle Ordovician of Tennessee that was first read as a comb jelly and later proposed to be a liverwort, an early land plant. An entry belongs here when its own cited article describes an Ordovician genus whose classification remains unsettled between competing interpretations. It excludes the problematic genera of the Proterozoic, Ediacaran, Cambrian, Devonian and later periods, which have groups of their own. The group lets a reader follow the questions that surround the early record of life in the oceans and on land.