Graptolithina is a class of hemichordate animal, the members of which are known as graptolites. Graptolites are fossil  colonial animals known chiefly from the Upper Cambrian through the Lower Carboniferous (Mississippian). A possible early graptolite, Chaunograptus, is known from the Middle Cambrian.

Graptolithina is a class of hemichordate animal, the members of which are known as graptolites. Graptolites are fossil  colonial animals known chiefly from the Upper Cambrian through the Lower Carboniferous (Mississippian). A possible early graptolite, Chaunograptus, is known from the Middle Cambrian.