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Systematic overview of the Pliocene molluscs and barnacles of the Barmur Group on Tjörnes, North Iceland Símonarson, L.A.; Eiríksson, J. (2021). Systematic overview of the Pliocene molluscs and barnacles of the Barmur Group on Tjörnes, North Iceland, in: Eiríksson, J. et al. Pacific - Atlantic mollusc migration: Pliocene inter-ocean gateway archives on Tjörnes, North Iceland. Topics in Geobiology, 52: pp. 237-441. https://dx.doi.org/10.1007/978-3-030-59663-7_7 In: Eiríksson, J.; Símonarson, L.A. (Ed.) (2021). Pacific - Atlantic mollusc migration: Pliocene inter-ocean gateway archives on Tjörnes, North Iceland. Topics in Geobiology, 52. Springer: Cham. e-ISBN 978-3-030-59663-7. X, 882 pp. https://dx.doi.org/10.1007/978-3-030-59663-7 In: Topics in Geobiology. Plenum: New York. ISSN 0275-0120

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Author keywords

Mollusc migration; Zoogeography; Pliocene peleoecology; Marine invertebrate systematics; Tjörnes; Iceland

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Auteurs		Top
Símonarson, L.A. Eiríksson, J.

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Abstract

Systematic overview of the molluscan and barnacle assemblages of the Pliocene Tjörnes sequence in North Iceland is primarily based on collections and fieldwork carried out during the last 50 years and collections of the Institute of Natural History in Reykjavík, the Geological Museum in Copenhagen, and the collection of the late farmer Jóhannes Björnsson in Ytri-Tunga on Tjörnes. We have identified 65 species of prosobranch gastropods, five opistobranch gastropod, 49 bivalve, one ammonite, and one barnacle species. Of the 119 molluscan species, 24 have not been recorded before from Tjörnes. About 25% of the mollusc species are extinct, and 25 of the recent molluscan species now live in southerly localities with higher sea temperatures. At least 32 of the species have their first appearance (FAD) in Tjörnes. The species are depicted on plates and variation in shape is demonstrated wherever possible. The distribution, recent or fossil, of species is shown, and ecological and biological features discussed. The larval development of the species is also summarized. The Tjörnes fauna is major record of trans-Arctic oceanic interchange that has been imperative in shaping the modern North Atlantic faunas. This review enables us to improve our understanding of the interchange.

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