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Graptoloidea

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 of Dendroidea, 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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"Graptoloidea." A Dictionary of Earth Sciences. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/graptoloidea

Graptoloidea

Graptoloidea See GRAPTOLITHINA.

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"Graptoloidea." A Dictionary of Zoology. . Encyclopedia.com. 20 Aug. 2017 <http://www.encyclopedia.com>.

"Graptoloidea." A Dictionary of Zoology. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/graptoloidea-0

"Graptoloidea." A Dictionary of Zoology. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/graptoloidea-0