On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean
Hemisphaerammina apta n. sp. is an attached monothalamous agglutinated foraminifera discovered in shelf sediments of the early Eocene Arctic Ocean. It is a simple yet distinctive component of the endemic agglutinated foraminiferal assemblage that colonized the Arctic Ocean after the microfaunal turn...
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007337 2023-05-15T14:51:06+02:00 On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean McNeil, David H. Neville, Lisa A. 2018-02 electronic https://doi.org/10.5194/jm-37-295-2018 https://noa.gwlb.de/receive/cop_mods_00007337 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007294/jm-37-295-2018.pdf https://jm.copernicus.org/articles/37/295/2018/jm-37-295-2018.pdf eng eng Copernicus Publications Journal of Micropalaeontology -- http://www.bibliothek.uni-regensburg.de/ezeit/?2053393 -- https://www.j-micropalaeontol.net/volumes.html -- http://jm.geoscienceworld.org/ -- 2041-4978 https://doi.org/10.5194/jm-37-295-2018 https://noa.gwlb.de/receive/cop_mods_00007337 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007294/jm-37-295-2018.pdf https://jm.copernicus.org/articles/37/295/2018/jm-37-295-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/jm-37-295-2018 2022-02-08T22:58:34Z Hemisphaerammina apta n. sp. is an attached monothalamous agglutinated foraminifera discovered in shelf sediments of the early Eocene Arctic Ocean. It is a simple yet distinctive component of the endemic agglutinated foraminiferal assemblage that colonized the Arctic Ocean after the microfaunal turnover caused by the Paleocene–Eocene Thermal Maximum. Associated foraminifera are characterized by a high percentage of monothalamous species (up to 60 %) and are entirely agglutinated indicating a brackish (mesohaline) early Eocene Arctic Ocean. Hemisphaerammina apta occurs exclusively as individuals attached to fine detrital grains (0.2 to 1.8 mm) of sediment. It is a small species (0.06 to 0.2 mm in diameter), fine-grained, with a low hemispherical profile, no floor across the attachment area, no substantive marginal flange, no internal structures, and no aperture. Lacking an aperture, it apparently propagated and fed through minute (micrometre-sized) interstitial pores in the test wall. Attachment surfaces vary from concave to convex and rough to smooth. Grains for attachment are diverse in shape and type but are predominantly of quartz and chert. The presence of H. apta in the early Eocene was an opportunistic response to an environment with an active hydrological system (storm events). Attachment to grains of sand would provide a more stable base on a sea floor winnowed by storm-generated currents. Active transport is indicated by the relative abundance of reworked foraminifera mixed with in situ species. Contemporaneous reworking and colonization by H. apta is suggested by its attachment to a reworked specimen of Cretaceous foraminifera. Article in Journal/Newspaper Arctic Arctic Ocean Foraminifera* Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Journal of Micropalaeontology 37 1 295 303 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung McNeil, David H. Neville, Lisa A. On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean |
topic_facet |
article Verlagsveröffentlichung |
description |
Hemisphaerammina apta n. sp. is an attached monothalamous agglutinated foraminifera discovered in shelf sediments of the early Eocene Arctic Ocean. It is a simple yet distinctive component of the endemic agglutinated foraminiferal assemblage that colonized the Arctic Ocean after the microfaunal turnover caused by the Paleocene–Eocene Thermal Maximum. Associated foraminifera are characterized by a high percentage of monothalamous species (up to 60 %) and are entirely agglutinated indicating a brackish (mesohaline) early Eocene Arctic Ocean. Hemisphaerammina apta occurs exclusively as individuals attached to fine detrital grains (0.2 to 1.8 mm) of sediment. It is a small species (0.06 to 0.2 mm in diameter), fine-grained, with a low hemispherical profile, no floor across the attachment area, no substantive marginal flange, no internal structures, and no aperture. Lacking an aperture, it apparently propagated and fed through minute (micrometre-sized) interstitial pores in the test wall. Attachment surfaces vary from concave to convex and rough to smooth. Grains for attachment are diverse in shape and type but are predominantly of quartz and chert. The presence of H. apta in the early Eocene was an opportunistic response to an environment with an active hydrological system (storm events). Attachment to grains of sand would provide a more stable base on a sea floor winnowed by storm-generated currents. Active transport is indicated by the relative abundance of reworked foraminifera mixed with in situ species. Contemporaneous reworking and colonization by H. apta is suggested by its attachment to a reworked specimen of Cretaceous foraminifera. |
format |
Article in Journal/Newspaper |
author |
McNeil, David H. Neville, Lisa A. |
author_facet |
McNeil, David H. Neville, Lisa A. |
author_sort |
McNeil, David H. |
title |
On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean |
title_short |
On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean |
title_full |
On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean |
title_fullStr |
On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean |
title_full_unstemmed |
On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera Hemisphaerammina apta n. sp., from the early Eocene Arctic Ocean |
title_sort |
on a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera hemisphaerammina apta n. sp., from the early eocene arctic ocean |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/jm-37-295-2018 https://noa.gwlb.de/receive/cop_mods_00007337 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007294/jm-37-295-2018.pdf https://jm.copernicus.org/articles/37/295/2018/jm-37-295-2018.pdf |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Foraminifera* |
genre_facet |
Arctic Arctic Ocean Foraminifera* |
op_relation |
Journal of Micropalaeontology -- http://www.bibliothek.uni-regensburg.de/ezeit/?2053393 -- https://www.j-micropalaeontol.net/volumes.html -- http://jm.geoscienceworld.org/ -- 2041-4978 https://doi.org/10.5194/jm-37-295-2018 https://noa.gwlb.de/receive/cop_mods_00007337 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007294/jm-37-295-2018.pdf https://jm.copernicus.org/articles/37/295/2018/jm-37-295-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/jm-37-295-2018 |
container_title |
Journal of Micropalaeontology |
container_volume |
37 |
container_issue |
1 |
container_start_page |
295 |
op_container_end_page |
303 |
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1766322167273750528 |