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Clonograptus
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Clonograptus

graptolite genus
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Article History

Clonograptus, genus of graptolites (extinct, small floating colonial animals related to the primitive chordates), characterized by a frondlike form. Groups of these animals were connected by stalklike structures to a central region. Various forms or species of Clonograptus are important guide, or index, fossils for the correlation of Ordovician rocks (505 to 438 million years ago).