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Temporal range: Carboniferous
Annularia Stellata.jpg
Annularia stellata
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Equisetopsida
Order: Equisetales
Family: Calamitaceae
Genus: Annularia
Specimen of Annularia on display at the State Museum of Pennsylvania

Annularia is a plant fossil from the Carboniferous (around 360 to 300 million years ago). It is a form taxon. Its radiating structures are most like the leaves of Calamites. Annularia are the leaf whorls of an extinct horsetail. Their stems were also like the stem of Calamites. These horsetails, Sphenopsida, grew to a height of 32 feet(10 meters) in a tree-like form.[1]

The foliage of Calamites

See also[edit]


1.[1] Annularia sp. Mazon Creek Fossils