Temporal range: Ordovician
~478–455 Ma
Graptolite tetragraptus.jpg
Tetragraptus fruticosus
Tetragraptus approximatus (Nicholson).jpg
Tetragraptus approximatus
Scientific classification
Kingdom: Animalia
Phylum: Hemichordata
Class: Pterobranchia
Order: Graptoloidea
Family: Dichograptidae
Genus: Tetragraptus
Salter, 1863

Tetragraptus is an extinct genus of graptolites from the Ordovician period.



Fossils of Tetragraptus have been found in Argentina, Australia, Bolivia, Canada (Quebec, Yukon, Newfoundland and Labrador and Northwest Territories), Chile, China, Colombia (near Caño Cristales, Meta), the Czech Republic, France, Morocco, New Zealand, Norway, the Russian Federation, Spain, Sweden, the United Kingdom, and the United States (Alaska, Idaho, Nevada, Utah).[1]


Further reading

  • Don Lessem & Jan Sovak (1999). Dinosaurs to Dodos: An Encyclopedia of Extinct Animals. Scholastic. ISBN 978-0-590-31684-2.

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