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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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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "Graptoloidea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "Graptoloidea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O13-Graptoloidea.html AILSA ALLABY and MICHAEL ALLABY. "Graptoloidea." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Graptoloidea.html |
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Graptoloidea
Graptoloidea See GRAPTOLITHINA.
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Cite this article
MICHAEL ALLABY. "Graptoloidea." A Dictionary of Zoology. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "Graptoloidea." A Dictionary of Zoology. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O8-Graptoloidea.html MICHAEL ALLABY. "Graptoloidea." A Dictionary of Zoology. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Graptoloidea.html |
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