Graptoloidea (subphylum Stomochordata, class Graptolithina)
An order of graptolites that existed from the Lower Ordovician
to Lower Devonian
. The rhabdosomes
had up to 8 stipes
in early forms, but 2 and finally 1 in later forms. The thecae
are of only one type, equivalent to the autotheca
, occur on one or both sides of the stipe, and vary quite widely in morphology. In adults, there is always a sicula
bearing a nema
. There are 3 suborders: 1, to which no name has been assigned, comprises a single, paraphyletic
family, Anisograptidae. The other 2 are Dichograptina and Virgellina.
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