Graptoloidea

Classification
Phylum: Hemichordata
Class: Graptolithina
Order: Graptoloidea (Lapworth, 1875)
Cincinnatian Families: Diplograptidae

Geologic Range
Early Ordovician – Late Silurian

Common Paleoecology
Graptoloidea is an extinct order of passively mobile planktonic suspension feeders

Characteristics of the Order

Sicula pendent from nema
uniserial or biserial (very rarely quadriserial)
Rhabdosome generally of few stipes
Comprising only one type of theca

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Treatise on Invertebrate Paleontology, Part V (1955):

Planktonic or epiplanktonic Graptolithina, sicula pendent from nema (virgula); stipes pendent to scandent in relation to this, uniserial or biserial (very rarely quadriserial); rhabdosome generally of few stipes, comprising only one type of theca (autotheca).

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Diplograptidae