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Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone

Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone
Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone
Paleodictyon is an important trace fossil characterised by a regular hexagonal structure and typical of ancient deep-ocean habitats as far back as the Ordovician. It is represented in modern deep-sea settings by Paleodictyon nodosum, known from the Mid-Atlantic Ridge, the South Atlantic, and off eastern Australia. Here we report the occurrence of P. nodosum in the Clarion Clipperton Zone (CCZ), abyssal equatorial Pacific, an area characterised by polymetallic nodule fields. At the study site within the International Seabed Authority northeastern Area of Particular Environmental Interest (APEI-6), P. nodosum appeared as a compact, regular pattern of small circular openings on the seafloor, each pattern interpreted as reflecting the activity of an individual organism. The patterns had a mean size (maximum dimension) of 45 mm?±?16 mm SD (n?=?841) and occurred at a density of 0.33 individuals m?2. Most (82%) were interrupted by nodules, but those that were not displayed both regular (59%) and irregular (41%) forms, the former having equal numbers of rows along the three axes (6 x 6 x 6 and 8 x 8 x 8). In both size and morphology, our Paleodictyon traces were more similar to the Australian examples than to those from the Mid-Atlantic Ridge.
Paleodictyon, Fossil, Clarion-Clipperton Zone, Graphoglyptid
1867-1616
265–269
Durden, Jennifer M.
d7101246-b76b-44bc-8956-8ca4ae62ae1f
Simon-Lledo, Erik
80f67b3a-44e7-466e-aed5-06b0ba788ca2
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Durden, Jennifer M.
d7101246-b76b-44bc-8956-8ca4ae62ae1f
Simon-Lledo, Erik
80f67b3a-44e7-466e-aed5-06b0ba788ca2
Gooday, Andrew J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a

Durden, Jennifer M., Simon-Lledo, Erik, Gooday, Andrew J. and Jones, Daniel O.B. (2017) Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone. Marine Biodiversity, 47 (2), 265–269. (doi:10.1007/s12526-017-0636-0).

Record type: Article

Abstract

Paleodictyon is an important trace fossil characterised by a regular hexagonal structure and typical of ancient deep-ocean habitats as far back as the Ordovician. It is represented in modern deep-sea settings by Paleodictyon nodosum, known from the Mid-Atlantic Ridge, the South Atlantic, and off eastern Australia. Here we report the occurrence of P. nodosum in the Clarion Clipperton Zone (CCZ), abyssal equatorial Pacific, an area characterised by polymetallic nodule fields. At the study site within the International Seabed Authority northeastern Area of Particular Environmental Interest (APEI-6), P. nodosum appeared as a compact, regular pattern of small circular openings on the seafloor, each pattern interpreted as reflecting the activity of an individual organism. The patterns had a mean size (maximum dimension) of 45 mm?±?16 mm SD (n?=?841) and occurred at a density of 0.33 individuals m?2. Most (82%) were interrupted by nodules, but those that were not displayed both regular (59%) and irregular (41%) forms, the former having equal numbers of rows along the three axes (6 x 6 x 6 and 8 x 8 x 8). In both size and morphology, our Paleodictyon traces were more similar to the Australian examples than to those from the Mid-Atlantic Ridge.

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Accepted/In Press date: 8 January 2016
e-pub ahead of print date: 21 January 2017
Published date: 1 June 2017
Keywords: Paleodictyon, Fossil, Clarion-Clipperton Zone, Graphoglyptid
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 405321
URI: https://eprints.soton.ac.uk/id/eprint/405321
ISSN: 1867-1616
PURE UUID: 35318274-9d0b-4b63-8608-5ffc0ccf2a9c

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Date deposited: 01 Feb 2017 10:08
Last modified: 09 Dec 2019 19:16

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