Definition of graptolite
: any of an extinct class (Graptolithina) of hemichordate colonial marine animals of the Paleozoic era with zooids contained in conical cups along a chitinous support
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Recent Examples of graptolite from the Web
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One of the most emblematic animals of the Ordovician Radiation is the now-extinct graptolite.
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Origin and Etymology of graptolite
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Britannica.com: Encyclopedia article about graptolite
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