Graptoloidea

Graptoloidea

[‚grap·tə′lȯid·ē·ə]
(paleontology)
An order of extinct animals in the class Graptolithina including branched, planktonic forms described from black shales.
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References in periodicals archive ?
Although this taxon was included in the Graptoloidea (Ruedemann 1947), most graptolite workers (Bulman 1955, 1970) take this assignment with caution.