Biogeography of Ordovician and Silurian gastropods, monoplacophorans and mimospirids

The biogeographical distribution of Ordovician and Silurian gastropods, monoplacophorans and mimospirids has been analysed on a generic level. The dataset contains 334 genera and 2769 species, yielding 1231 records of genera with 2274 occurrences worldwide. There is a bias towards eastern Laurentia,...

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Bibliographic Details
Published in:Geological Society, London, Memoirs
Main Authors: Ebbestad, Janove R., Frýda, Jir̂í, Wagner, Peter J., Horný, Radvan J., Isakar, Mare, Stewart, Sarah, Percival, Ian G., Bertero, Verónica, Rohr, David M., Peel, John S., Blodgett, Robert B., Högström, Anette E S
Format: Article in Journal/Newspaper
Language:English
Published: 2013
Subjects:
Alaska
Siberia
Online Access:https://researchers.mq.edu.au/en/publications/6d38fa2d-9b8e-47cc-b794-67cba991a608
https://doi.org/10.1144/M38.15
http://www.scopus.com/inward/record.url?scp=84889670777&partnerID=8YFLogxK
Description
Summary:The biogeographical distribution of Ordovician and Silurian gastropods, monoplacophorans and mimospirids has been analysed on a generic level. The dataset contains 334 genera and 2769 species, yielding 1231 records of genera with 2274 occurrences worldwide. There is a bias towards eastern Laurentia, Baltica and Perunica records. Some 53.1% of the records are Ordovician. The study demonstrates that these molluscs are well suited to being used to improve understanding of Ordovician and Silurian biogeographical provinciality. Specific points are that: a Lower Ordovician assemblage is evident in Laurentia; the fauna of the Argentinean Precordillera is Laurentian until the Darriwilian, when taxa are shared with North China; Late Silurian gastropods from the Alexander terrane (SE Alaska) are unknown in Laurentia, but support a rift origin of this terrane from NE Siberia; Perunica, Ibero-Armorica and Morocco cluster together throughout the Ordovician but Perunica and Morocco are closer; Darriwilian-Sandbian deep-water Bohemian taxa occur in Baltica; a Laurentian-Baltica proximity is unsupported until the Silurian; Siberia clusters with North China and eastern Laurentia during the Tremadocian-Darriwilian; during the Gorstian-Pridoli Siberia clusters with the Farewell and Alexander terranes; North China may have been close to Laurentia and the Argentinean margin of Gondwana; and the affinity of Tarim taxa is problematic.

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