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in the late 19th century. Graptolithus, as a genus, was officially abandoned in 1954 by the ICZN.

Morphology

Colony structure

Each graptolite colony originates from an initial individual, called the sicular zooid, from which the subsequent zooids will develop. They are all interconnected by stolons, a true colonial system shared by Rhabdopleura but not Cephalodiscus. These zooids are

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