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The morphology and systematics of ‘Didymograptus’ spinosus Ruedemann, 1904, and allied species from the Lower Ordovician

Published online by Cambridge University Press:  01 May 2009

J. B. Archer  and
D. Skevington
J. B. Archer
Affiliation:
Department of Geology, University College, Galway, Ireland
D. Skevington
Affiliation:
Department of Geology, University College, Galway, Ireland
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Summary

The first European occurrence of ‘Didymograptus’ spinosus Ruedemann, 1904, is reported. A re-description of this species is provided, based on the lectotype and new material from the West of Ireland. ‘D.’ spinosus is shown to possess the essential characteristics of the genus Holmograptus Koztowski, 1954, to which it is accordingly referred.

Didymograptus nodosus Harris, 1926, and Tylograptus regularis Mu, 1957, together with certain other species of Tylograptus described by Mu (1957), are junior synonyms of Holmograptus spinosus. Holmograptus Kozlowski, 1954, is a senior synonym of Tylograptus Mu, 1957.

Type
Articles
Information
Geological Magazine , Volume 110 , Issue 1 , January 1973 , pp. 43 - 54
Copyright
Copyright © Cambridge University Press 1973

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