The morphology and systematics of ‘Didymograptus’ spinosus Ruedemann, 1904, and allied species from the Lower Ordovician
- 1 January 1973
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 110 (1) , 43-54
- https://doi.org/10.1017/s0016756800047282
Abstract
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.Keywords
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