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Annularia Calamites Cross-Section Replica measures 3.1 inches. Annularia Calamites Cross-Section Replica is museum quality polyurethane cast. Made in USA. Annularia is a form taxon. It is the name given to Calamites leaves.
Annularia is a form taxon name given to leaves of Calamites. In that species, the leaves formed radiating leaf whorls at each stem node, in a similar way to the branches of Equisetum, an extant genus of horsetails.
Annularia leaves are arranged in whorls of between 8-13 leaves. The leaf shape is quite variable, being oval in Annularia sphenophylloides and linear to lanceolate in Annularia radiata, but they are always flat and of varying lengths.
Calamites were arborescent and grew to a height of 32 feet (9.8 meters).
Prehistoric plants of North America fossils of this genus have been discovered in the Permian strata of Russia and in the Carboniferous (around 360 to 300 million years ago) strata of the United States, Canada, China and Europe.
In fact the stems and the radiating structures of the leaf whorls is similar in the Calamites, an extinct genus of horsetails. Fossils of this genus have been discovered in the Permian strata of Russia and in the Carboniferous (around 360 to 300 million years ago) strata of the United States, Canada, China and Europe. Pennsylvanian. Mazon Creek, Illinois.
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