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New species of the xenophyophore genus Aschemonella (Rhizaria: Foraminifera) from areas of the abyssal eastern Pacific licensed for polymetallic nodule exploration

Gooday, Andrew J; Holzmann, Maria; Caulle, Clemence; Goineau, Aurélie; Jones, Daniel O.B.; Kamenskaya, Olga; Simon-Lledó, Erik; Weber, Alexandra A -T; Pawlowski, Jan. 2017 New species of the xenophyophore genus Aschemonella (Rhizaria: Foraminifera) from areas of the abyssal eastern Pacific licensed for polymetallic nodule exploration. Zoological Journal of the Linnean Society, 182 (3). 479-499. https://doi.org/10.1093/zoolinnean/zlx052

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Abstract/Summary

We describe Aschemonella monile Gooday and Holzmann sp. nov. from the Clarion–Clipperton Zone (CCZ, abyssal eastern equatorial Pacific), a region characterized by commercially significant concentrations of polymetallic nodules. The new species is the most abundant xenophyophore (giant agglutinated foraminifera) in our main sampling area (12–14°N; 116°30′–117°26′W). Additional specimens originate from the central CCZ, and from a third area, ~900 km NW of the main area, where A. monile numerically dominates the megabenthos in photographic surveys of the seafloor (average densities 1.54 individuals/m2; peak densities > 3 individuals/m2). Aschemonella monile is much larger (≥ 7 cm in length) than previously described species of the genus, with a test comprising an irregular sequence of self-contained, partly overlapping ‘segments’, creating a multichambered structure. A similar, much rarer species from the main study area, described here as Aschemonella aspera Gooday and Holzmann sp. nov., has an unsegmented test with a very rough, coarsely agglutinated wall. Genetic data suggest that A. monile is distinct from A. aspera and most closely related to a group comprising Rhizammina algaeformis and Aschemonella ramuliformis. Both new species have delicate tests that are often attached to nodule surfaces, making them particularly vulnerable to seafloor disturbances.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1093/zoolinnean/zlx052
ISSN: 0024-4082
Date made live: 25 Apr 2018 15:18 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/519899

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