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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.

The name graptolite comes from the Greek graptos, meaning "written", and lithos, meaning "rock", as many graptolite fossils resemble hieroglyphs written on the rock. Linnaeus originally regarded them as 'pictures resembling fossils' rather than true fossils, though later workers supposed them to be related to the hydrozoans.[citation needed] More recent work places them near the pterobranchs, possibly within. One analysis suggests that the Pterobranchia represent extant graptolites

in the show Sea monsters With several Graptolite featured in the first episode as background animals floating in the background in the seventh of the dangerous seas

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