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Biogeography of northeastern Atlantic Neogene chitons (Mollusca, Polyplacophora): New data from the Pliocene of Portugal

Published online by Cambridge University Press:  08 March 2022

Bruno Dell'Angelo ,
Bernard M. Landau ,
Carlos Marques da Silva Open the ORCID record for Carlos Marques da Silva [Opens in a new window]  and
Maurizio Sosso
Bruno Dell'Angelo
Affiliation:
Via Briscata 16/6, 16154 Genova, Italy
Bernard M. Landau
Affiliation:
Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, The Netherlands; and International Health Centres, Av. Infante de Henrique 7, Areias São João, P-8200 Albufeira, Portugal
Carlos Marques da Silva*
Affiliation:
Departamento de Geologia and Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal
Maurizio Sosso
Affiliation:
Via Bengasi 4, 16153 Genova, Italy
*
*Corresponding author
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Abstract

Based on extensive new material, 2088 valves resulting from search sampling of ~500 kg of sediment, the Pliocene chiton biodiversity of the Mondego Basin (Portugal) is reassessed. Twelve species were identified, assigned to seven genera. Eight species are new for the Pliocene of Portugal, as well as two of the genera: Hanleya, Acanthochitona. Two taxa are described as new: Ischnochiton loureiroi n. sp. and Lepidochitona rochae n. sp. Until now, the polyplacophoran European Neogene record was too poorly known to be of help in generating a clear picture of the Miocene to present-day biogeography of the group. This new wealth of data from western Iberia, in conjunction with recent data from the Loire Basin Upper Miocene assemblages (France), allows clarification the Late Miocene to Recent eastern Atlantic and Mediterranean biogeography of the Polyplacophora. The northern range of warm-water northeast Atlantic and Mediterranean Polyplacophora experienced a sharp contraction since, at least, Late Miocene to Early Pliocene times. Warm-water chiton species represented in the Upper Miocene of the Loire Basin of NE France (European-West African Province) and the Pliocene of the Mondego Basin of central-west Portugal (Pliocene French-Iberian Province) are today confined to the southern Mediterranean-Moroccan Molluscan Province.

UUID: http://zoobank.org/a2a550c0-caed-449a-aa45-9492c45f882e

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Journal of Paleontology , Volume 96 , Issue 4 , July 2022 , pp. 814 - 838
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Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Paleontological Society

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