Amano, K and Little, CTS (2014) Miocene abyssochrysoid gastropod Provanna from Japanese seep and whale-fall sites. Acta Palaeontologica Polonica, 59 (1). 163 - 172. ISSN 0567-7920
Abstract
We describe three Miocene species of Provanna from Japan, two new and one in open nomenclature, that represent the only known fossil examples from whale-falls and a considerable increase in the Miocene diversity of the genus. Provanna hirokoae sp. nov. comes from the latest Middle Miocene Kuroiwa seep site in central Honshu. The shells of this species are mostly recrystallized, but contain relict crossed lamellar microstructures. Provanna alexi sp. nov. is from the early Middle Miocene Shosanbetsu whale-fall site in northwestern Hokkaido, and has well preserved shells comprising an outer simple prismatic layer and an inner crossed lamellar layer. The two Provanna specimens from the Middle Miocene Rekifune whale-fall site, in eastern Hokkaido, are preserved as external moulds only, so are left in open nomenclature. Based on current knowledge, the presence of an outer prismatic layer and an underlying crossed lamellar layer seems to be a common feature in the shells of Provanna, as well as in other genera belonging to the family Provannidae and the superfamily Abyssochrysoidea. Although the oldest occurrence of Provanna was in the Late Cretaceous, the genus did not spread geographically and ecologically until the Miocene (with four, or possibly five species), a date concordant with some molecular estimates. However, this could be an artefact of the fossil record because the known pre-Miocene seep and whale-falls are more geographically restricted than those from the Miocene.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright © 2014 K. Amano and C.T.S. Little. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
Keywords: | Mollusca; Gastropoda; Provanna; seep; whale-fall; Miocene |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Mar 2014 11:45 |
Last Modified: | 15 Sep 2014 01:41 |
Published Version: | http://dx.doi.org/10.4202/app.2012.0002 |
Status: | Published |
Publisher: | Polish Academy of Sciences, Institue of Paleobiology |
Identification Number: | 10.4202/app.2012.0002 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:78196 |