The University of Southampton
University of Southampton Institutional Repository

The ‘mica sandwich’; a remarkable new genus of Foraminifera (Protista, Rhizaria) from the Nazaré Canyon (Portuguese margin, NE Atlantic)

The ‘mica sandwich’; a remarkable new genus of Foraminifera (Protista, Rhizaria) from the Nazaré Canyon (Portuguese margin, NE Atlantic)
The ‘mica sandwich’; a remarkable new genus of Foraminifera (Protista, Rhizaria) from the Nazaré Canyon (Portuguese margin, NE Atlantic)
Based on morphological and molecular characteristics, we describe a new genus and species of monothalamous agglutinated foraminifera, Capsammina patelliformis, that occurs mainly at bathyal (1000-3400m) water depths in the Nazaré Canyon off Portugal. The test is strongly flattened, up to 500?m or more in maximum dimension, and 30-80?m thick. It lacks obvious apertures, and is typically composed of 2-3 large, plate-like grains of mica that form the upper and lower surface of the test; these are separated by fine-grained, white agglutinated material (‘mortar’) forming a ring around the cell body. The cytoplasm, visible through the mica plates, is whitish in colour with few obvious inclusions.Analysis of a fragment of the SSUrDNA gene indicates thatC. patelliformis belongs in a clade branching with Crithionina delacai, C. granum and an undetermined crithioninid species. However, the divergences between the new species and these Crithionina species range from 20% to 21%, and are therefore too high to classify it in the same genus. We also transfer a previously described species, Psammosphaera bowmanni Heron-Allen and Earland 1912, to Capsammina based on its use of mica flakes in test construction. Other monothalamous agglutinated foraminifera, including Psammosphera spp., are phylogenetically distant from Capsammina. The new species occupies a shallow infaunal microhabitat, living mainly in the top 0.5cm of sediment.
0026-2803
345-357
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
da Silva, Ana Aranda
93584367-08bf-4d23-b388-d47aa2f30173
Koho, Karoliina A.
df4a1b81-baef-4a10-9c56-f4a3bed2534e
Lecroq, Béatrice
215155ae-4349-4532-9c32-729460a381f5
Pearce, Richard B.
7d772b25-3ad0-4909-9a96-3a1a8111bc2f
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
da Silva, Ana Aranda
93584367-08bf-4d23-b388-d47aa2f30173
Koho, Karoliina A.
df4a1b81-baef-4a10-9c56-f4a3bed2534e
Lecroq, Béatrice
215155ae-4349-4532-9c32-729460a381f5
Pearce, Richard B.
7d772b25-3ad0-4909-9a96-3a1a8111bc2f

Gooday, Andrew J., da Silva, Ana Aranda, Koho, Karoliina A., Lecroq, Béatrice and Pearce, Richard B. (2010) The ‘mica sandwich’; a remarkable new genus of Foraminifera (Protista, Rhizaria) from the Nazaré Canyon (Portuguese margin, NE Atlantic). Micropaleontology, 56 (3-4), 345-357.

Record type: Article

Abstract

Based on morphological and molecular characteristics, we describe a new genus and species of monothalamous agglutinated foraminifera, Capsammina patelliformis, that occurs mainly at bathyal (1000-3400m) water depths in the Nazaré Canyon off Portugal. The test is strongly flattened, up to 500?m or more in maximum dimension, and 30-80?m thick. It lacks obvious apertures, and is typically composed of 2-3 large, plate-like grains of mica that form the upper and lower surface of the test; these are separated by fine-grained, white agglutinated material (‘mortar’) forming a ring around the cell body. The cytoplasm, visible through the mica plates, is whitish in colour with few obvious inclusions.Analysis of a fragment of the SSUrDNA gene indicates thatC. patelliformis belongs in a clade branching with Crithionina delacai, C. granum and an undetermined crithioninid species. However, the divergences between the new species and these Crithionina species range from 20% to 21%, and are therefore too high to classify it in the same genus. We also transfer a previously described species, Psammosphaera bowmanni Heron-Allen and Earland 1912, to Capsammina based on its use of mica flakes in test construction. Other monothalamous agglutinated foraminifera, including Psammosphera spp., are phylogenetically distant from Capsammina. The new species occupies a shallow infaunal microhabitat, living mainly in the top 0.5cm of sediment.

Text
Gooday_et_al_2010_Micropaleontology.pdf - Version of Record
Restricted to Repository staff only
Request a copy

More information

Published date: 2010
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 169405
URI: http://eprints.soton.ac.uk/id/eprint/169405
ISSN: 0026-2803
PURE UUID: 0247b1fa-6602-4740-93e4-0309c86556f2

Catalogue record

Date deposited: 14 Dec 2010 16:59
Last modified: 14 Mar 2024 02:20

Export record

Contributors

Author: Andrew J. Gooday
Author: Ana Aranda da Silva
Author: Karoliina A. Koho
Author: Béatrice Lecroq

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×