Graptolites exist as significant hemichordates that ranged from the Cambrian-carboniferous periods.
Graptolites are colony creatures that belong to the subclass Graptolithina of the Pterobranchia class. The majority of the fossil evidence for these filter-feeding organisms dates from the Middle Cambrian to the Lower Carboniferous. Chaunograptus, a probable early graptolite, was discovered in the Middle Cambrian.
This order of graptolites likely went extinct as a result of a widespread decline in planktonic biomass after the Ordovician, including the phytoplankton component that the graptolites likely fed on.
Graptolites are a diverse and significant group of extinct, totally marine, colonial creatures that have been preserved in the fossil record. They are frequently discovered in sediments formed in deep water habitats as flattened, carbonized specimens.
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