On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera &amp;lt;i&amp;gt;Hemisphaerammina apta&amp;lt;/i&amp;gt; n. sp., from the early Eocene Arctic Ocean

McNeil, D H; Neville, Lisa A.

doi:10.5194/jm-37-295-2018

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…The study depicts that trochospiral forms are related to very shallow water palaeoenvironment and infaunal life style. McNeil and Neville (2018) were able to show the relationship between microhabitat and the agglutinated foraminifer palaeoecology. Additionally, poorly to medium sorted fabrics are recognized which confirm agitation of sedimentary environment during deposition.…”

Section: Discussionmentioning

confidence: 99%

Microfacies and depositional environment of Tarbur Formation (Upper Cretaceous‐Lower Palaeocene) Zagros area, southwestern Iran

Afghah

2022

Geological Journal

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Over 3,000 m of Upper Cretaceous‐Lower Palaeocene sediments belonging to the Tarbur Formation were studied in seven stratigraphic sections around Shiraz city (south Zagros Basin, SW of Iran). The Tarbur Formation is divided into two informal lithostratigraphic units: a lower well‐bedded rudist limestone and an upper massive rudist limestone. Both units comprise rudist particles as a major organo‐detrital component. Microscopic studies have identified the presence of the following carbonate microfacies types in the Tarbur Formation: rudist orbitoid wackestone, miliolid algal‐bioclast wackestone, rudist packstone, rudist orbitoid packstone, rudist intraclast miliolid packstone, rudist‐agglutinated foraminifer grainstone, orbitoid rudist grainstone, rudist‐hyaline foraminifer‐intraclast grainstone, rudist boundstone and coral boundstone, which are attributed to shallow water lagoon, bar and fore‐reef palaeoenvironments. The rudist fragments co‐existed with a Campanian/Maastrichtian foraminiferal assemblage. The stratigraphic distribution of the investigated microfacies was affected by vertical displacement of studied area basement faults.

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Section: Discussionmentioning

confidence: 99%

Microfacies and depositional environment of Tarbur Formation (Upper Cretaceous‐Lower Palaeocene) Zagros area, southwestern Iran

Afghah

2022

Geological Journal

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“…The genus Hemisphaerammina is an attached agglutinated monothalamid (Loeblich & Tappan, 1957). This genus, and, in particular, species Hemisphaerammina apta , is known for its preference for specific microenvironments, including attaching to detrital grains of sand in marine shelf environments (McNeil & Neville, 2018). Another genus, Flexammina , is a shallow‐water inhabitant with a flexible agglutinated test and the capacity for extreme shape transformation (Voltski & Pawlowski, 2015).…”

Section: Discussionmentioning

confidence: 99%

Newly designed foraminifera primers identify habitat‐specific lineages through metabarcoding analyses

Thakur

Collens

Greco

et al. 2022

J Eukaryotic Microbiology

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Foraminifera include diverse shell‐building lineages found in a wide array of aquatic habitats from the deep‐sea to intertidal zones to brackish and freshwater ecosystems. Recent estimates of morphological and molecular foraminifera diversity have increased the knowledge of foraminiferal diversity, which is critical as these lineages are used as bioindicators of past and present environmental perturbation. However, a comparative analysis of foraminiferal biodiversity between their major habitats (freshwater, brackish, intertidal, and marine) is underexplored, particularly using molecular tools. Here, we present a metabarcoding survey of foraminiferal diversity across different ecosystems using newly designed foraminifera‐specific primers that target the hypervariable regions of the foraminifera SSU‐rRNA gene (~250–300 bp long). We tested these primer sets on four foraminifera species and then across several environments: the intertidal zone, coastal ecosystems, and freshwater vernal pools. We retrieved 655 operational taxonomic units (OTUs); the majority of which are undetermined taxa that have no closely matching sequences in the reference database. Furthermore, we identified 163 OTUs with distinct habitat preferences. Most of the observed OTUs belonged to lineages of single‐chambered foraminifera, including poorly explored freshwater foraminifera which encompass a clade of Reticulomyxa‐like forms. Our pilot study provides the community with an additional set of newly designed and taxon‐specific primers to elucidate foraminiferal diversity across different habitats.

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Stratigraphic Drilling in the Northeastern Laptev Sea: Main Results and Further Development

Malyshev,

Verzhbitskii,

Danilkin

et al. 2024

Russian Geology and Geophysics

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The Russian sector of the Eastern Arctic is characterized by large basins with thick sedimentary filling, primarily on the shelf and continental slope of the seas of the Arctic Ocean. A number of geological, geophysical, and geochemical features point to a hydrocarbon potential. At the same time, the age and composition of the sedimentary infill of the shelf basins have been controversial until now due to the lack of wells drilled in the shelf area. Six stratigraphic wells were drilled with core sampling in the eastern Laptev Sea (Anisin–Novosibirsk block owned by Rosneft) with a depth of 100 to 199.5 m during the Rosneft Stratigraphic Drilling in Arctic (RoSDAr) project in 2021. The results of complex biostratigraphic studies of the core show that the oldest strata in the well sections are Upper Barremian – Lower Aptian deformed silty mudstones (folded basement assemblage) overlain with angular unconformity by sands, silts, and clays of the Paleocene. The wells also penetrate the Eocene, Oligocene, and Miocene-Quaternary clastic rocks. A comprehensive analysis of stratigraphic drilling and seismic data refines the geological models of the region and provides better understanding of its hydrocarbon potential. The data show that Cenozoic strata play a more significant role in the sedimentary cover of the Laptev Sea than was previously assumed.

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On a grain of sand – a microhabitat for the opportunistic agglutinated foraminifera <i>Hemisphaerammina apta</i> n. sp., from the early Eocene Arctic Ocean

Cited by 3 publications

References 30 publications

Microfacies and depositional environment of Tarbur Formation (Upper Cretaceous‐Lower Palaeocene) Zagros area, southwestern Iran

Microfacies and depositional environment of Tarbur Formation (Upper Cretaceous‐Lower Palaeocene) Zagros area, southwestern Iran

Newly designed foraminifera primers identify habitat‐specific lineages through metabarcoding analyses

Stratigraphic Drilling in the Northeastern Laptev Sea: Main Results and Further Development

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