Xenophyophores (Rhizaria, Foraminifera) from the Eastern Clarion-Clipperton Zone (equatorial Pacific): the Genus Psammina
Xenophyophores (Rhizaria, Foraminifera) from the Eastern Clarion-Clipperton Zone (equatorial Pacific): the Genus Psammina
Xenophyophores are important megafaunal organisms in the abyssal Clarion-Clipperton Zone (CCZ; equatorial Pacific), a region hosting commercially significant deposits of polymetallic nodules. Previous studies assigned those with attached, fan-like tests to Psammina limbata, a species described from the central CCZ based on morphology. Here, we redescribe the holotype of P. limbata and then show that limbata-like morphotypes collected in the eastern CCZ include three genetically distinct species. Psammina aff. limbata is closest morphologically to P. limbata. The others are described as P. microgranulata sp. nov. and P. rotunda sp. nov. These fan-shaped species form a well-supported clade with P. tortilis sp. nov., a morphologically variable species exhibiting features typical of both Psammina and Semipsammina. A second clade containing Psammina sp. 3, and two species questionably assigned to Galatheammina branches at the base of this group. The genus Psammina includes another 9 described species for which there are no genetic data, leaving open the question of whether Psammina as a whole is monophyletic. Our study increases the number of xenophyophore species described from the eastern CCZ from 8 to 11, with a further 25 morphotypes currently undescribed. Many additional species of these giant foraminifera undoubtedly await discovery in abyssal settings.
Agglutinated foraminifera, deep-sea mining, monothalamids, new species, polymetallic nodules., SSU rDNA sequences
926-957
Gooday, Andrew J.
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Holzmann, Maria
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Goineau, Aurélie
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Kamenskaya, Olga
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Melnik, Vyacheslav F.
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Pearce, Richard B.
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Weber, Alexandra A.T.
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Pawlowski, Jan
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1 December 2018
Gooday, Andrew J.
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Holzmann, Maria
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Goineau, Aurélie
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Kamenskaya, Olga
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Melnik, Vyacheslav F.
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Pearce, Richard B.
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Weber, Alexandra A.T.
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Pawlowski, Jan
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Gooday, Andrew J., Holzmann, Maria, Goineau, Aurélie, Kamenskaya, Olga, Melnik, Vyacheslav F., Pearce, Richard B., Weber, Alexandra A.T. and Pawlowski, Jan
(2018)
Xenophyophores (Rhizaria, Foraminifera) from the Eastern Clarion-Clipperton Zone (equatorial Pacific): the Genus Psammina.
Protist, 169 (6), .
(doi:10.1016/j.protis.2018.09.003).
Abstract
Xenophyophores are important megafaunal organisms in the abyssal Clarion-Clipperton Zone (CCZ; equatorial Pacific), a region hosting commercially significant deposits of polymetallic nodules. Previous studies assigned those with attached, fan-like tests to Psammina limbata, a species described from the central CCZ based on morphology. Here, we redescribe the holotype of P. limbata and then show that limbata-like morphotypes collected in the eastern CCZ include three genetically distinct species. Psammina aff. limbata is closest morphologically to P. limbata. The others are described as P. microgranulata sp. nov. and P. rotunda sp. nov. These fan-shaped species form a well-supported clade with P. tortilis sp. nov., a morphologically variable species exhibiting features typical of both Psammina and Semipsammina. A second clade containing Psammina sp. 3, and two species questionably assigned to Galatheammina branches at the base of this group. The genus Psammina includes another 9 described species for which there are no genetic data, leaving open the question of whether Psammina as a whole is monophyletic. Our study increases the number of xenophyophore species described from the eastern CCZ from 8 to 11, with a further 25 morphotypes currently undescribed. Many additional species of these giant foraminifera undoubtedly await discovery in abyssal settings.
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Accepted/In Press date: 24 September 2018
e-pub ahead of print date: 5 October 2018
Published date: 1 December 2018
Keywords:
Agglutinated foraminifera, deep-sea mining, monothalamids, new species, polymetallic nodules., SSU rDNA sequences
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Local EPrints ID: 426621
URI: http://eprints.soton.ac.uk/id/eprint/426621
ISSN: 1434-4610
PURE UUID: 32a00918-3c94-4f8e-b0f9-abcef5080abd
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Date deposited: 06 Dec 2018 17:30
Last modified: 17 Mar 2024 12:15
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Contributors
Author:
Andrew J. Gooday
Author:
Maria Holzmann
Author:
Aurélie Goineau
Author:
Olga Kamenskaya
Author:
Vyacheslav F. Melnik
Author:
Alexandra A.T. Weber
Author:
Jan Pawlowski
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