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Graptolithina

Graptolithina

A Dictionary of Zoology | 1999 | | Copyright

Graptolithina (graptolites; phylum Hemichordata) A class of extinct, colonial, marine organisms which secreted a chitinous exoskeleton with characteristic growth bands and lines. The complete skeleton (colony) is referred to as a rhabdo-some. They first appeared in the Middle Cambrian and are last known from the Lower Carboniferous. The class comprises two principal orders: true (graptoloid) graptolites (Graptoloidea), which are important zonal fossils in Ordovician and Silurian rocks; and the dendroid graptolites (Dendroidea).
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MICHAEL ALLABY. "Graptolithina." A Dictionary of Zoology. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

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Graptolithina

A Dictionary of Earth Sciences | 1999 | | Copyright

Graptolithina (graptolites; phylum Hemichordata, subphylum Stomochordata) An extinct class of stick-like, colonial, marine organisms that existed from the Middle Cambrian to the Lower Carboniferous. Their fossils are used to establish a stratigraphical time-scale for the Lower Palaeozoic. There were 2 principal orders, Dendroidea and Graptoloidea, and a number of minor, short-lived orders.
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AILSA ALLABY and MICHAEL ALLABY. "Graptolithina." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Graptolithina." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O13-Graptolithina.html

AILSA ALLABY and MICHAEL ALLABY. "Graptolithina." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Graptolithina.html

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