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Graptolite
Taxonomy
Phylum: Hemichordata
Class: Graptolithina
Diagnostic features
Stick-shape (often branched)
One or both edges may appear serrated
Thecae
Rhabdosome
Stipes
Stratigraphic range
Cambrian to Carboniferous (Dendroids)
Ordovician to Middle Devonian…