graptolite

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graptolite

any extinct Palaeozoic colonial pelagic animal of the class Graptolithina. Branching forms are found in later strata and up to Carboniferous times.
References in periodicals archive ?
Evolution of the Zooidal Behavior and Its Relation to Skeletal Structure of the Retiolitidae (Graptolithina).
The simplest retiolitid (Graptolithina) species Plectodinemagraptus gracilis from the Ludlow of Poland.
This material was redescribed and discussed by Mierzejewski (1991), who excluded these fossils from Graptolithina and treated them as incertae sedis.