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Didymograptus; Temporal range: Middle Ordovician; ~478–443 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Didymograptus murchisoni, Wales
Scientific classification
Kingdom:	Animalia
Phylum:	Hemichordata
Class:	†Graptolithinia
Genus:	†Didymograptus; McCoy 1851
	D. artus; D. euodus; D. gracilis; D. murchisoni; D. nicholsoni;

Didymograptus is an extinct genus of graptolites with four rows of cups. They lived during the Middle Ordovician,^[1] to Late Ordovician.^[2]

Distribution

Fossils of Didymograptus have been found in Argentina, Australia, Bolivia, Canada (Northwest Territories, Quebec, Yukon, Newfoundland and Labrador), Chile, China, Colombia (Tarqui, Huila),^[3] the Czech Republic, Estonia, France, Iran, Morocco, New Zealand, Norway, Peru, Portugal, the Russian Federation, Saudi Arabia, Spain, Sweden, the United Kingdom, the United States (Alaska, California, Idaho, Nevada, New York, Utah), and Venezuela.^[2]

References

^ Palmer, Douglas; et al. (2009). "Ordovician". Prehistoric Life: the Definitive Visual History of Life on Earth (first American ed.). New York City: DK Publishing. p. 89. ISBN 978-0-7566-5573-0.
^ ^a ^b Didymograptus at Fossilworks.org
^ Moreno et al., 2008, p.10

Bibliography

Moreno Sánchez, Mario; Jesus Gómez Cruz, Arley de; Castillo González, Hardany (2008), "Graptolitos del Ordovícico y geología de los afloramientos del Río Venado (norte del Departamento del Huila)" (PDF), Boletín de Geología, 30: 9–19, retrieved 2017-03-31

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[1] Palmer, Douglas; et al. (2009). "Ordovician". Prehistoric Life: the Definitive Visual History of Life on Earth (first American ed.). New York City: DK Publishing. p. 89. ISBN 978-0-7566-5573-0.

[FWDidymograptus-2] Didymograptus at Fossilworks.org

[Moreno_p10-3] Moreno et al., 2008, p.10

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