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Tetragraptus 
Summary
Tetragraptus is an extinct genus of graptolites from the Ordovician period.
| Tetragraptus Temporal range: Ordovician
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| Tetragraptus fruticosus | |
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| Tetragraptus approximatus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Hemichordata |
| Class: | Pterobranchia |
| Order: | †Graptoloidea |
| Family: | †Dichograptidae |
| Genus: | †Tetragraptus Salter, 1863 |
| Species | |
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Species[1] edit
- T. akzharensis
- T. approximatus
- T. fruticosus
- T. insuetus
Distribution edit
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]
References edit
- ^ a b Tetragraptus at Fossilworks.org
Further reading edit
- Don Lessem & Jan Sovak (1999). Dinosaurs to Dodos: An Encyclopedia of Extinct Animals. Scholastic. ISBN 978-0-590-31684-2.