graptolite

noun

grap·to·lite | \ ˈgrap-tə-ˌlīt

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

Examples of graptolite in a Sentence

Recent Examples on the Web

One of the most emblematic animals of the Ordovician Radiation is the now-extinct graptolite. — Annalee Newitz, Ars Technica, "If you liked the Cambrian Explosion, you’ll love the Ordovician Radiation," 21 Nov. 2017

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