Image dataset of common benthic foraminiferal taxa in the North Atlantic seafloor surface sediments (59.5°N transect) between the Labrador sea and Faeroe-Shetland sill

Abstract

The article presents a microphotograph dataset of 106 taxa of benthic foraminifera (BF) from surface sediments collected at 26 grab station during RV Akademik Ioffe 51st cruise (summer 2016). The selected stations are located along a 59.5°N transect in the North Atlantic. This is the key area of climate control, where the interaction of warm surface and cold deep water masses takes place, which affects the operation of the global oceanic thermohaline circulation. The analysis of the benthic foraminiferal assemblages allows us to describe the properties of bottom water mass, to draw conclusions about the environmental parameters at the bottom. This photo dataset will facilitate the identification of species of BF, and thus will accelerate the routine process of micropaleontological analysis and the subsequent reconstruction of environmental conditions.

Specifications Table

Subject	Earth and Planetary Sciences Paleontology
Specific subject area	Benthic Foraminifera Marine bottom sediments
Type of data	Tables Figure Phototables
How data were acquired	Samples were collected during the expedition to the North Atlantic in the summer 2016, using grab sampler; benthic foraminifera were identified to the species level and counted under the microscope ZEISS Stemi 508; photos were made using a Nikon microscope SMZ25 equipped with a Nikon camera DS-Fi3 and NIS-Elements D software. Microphotograph tables were made in the computer program CorelDRAW12.
Data format	Microphotograph tables of benthic foraminifera– raw data; figure with map of station– raw data; table with station list and their coordinates, and total counts of individual species– raw data.
Parameters for data collection	Standard laboratory processing of samples for micro-palaeontological analysis of bottom sediments using sieves of mesh size 63 μm.
Description of data collection	The samples were identified under the stereomicroscope, BF tests were counted and selected for the microphotography according the typical description of species.
Data source location	The North Atlantic at 59.5° N transect, the Labrador Sea and the Faeroe-Shetland sill (GPS coordinates are provided in the table 1).
Data accessibility	The data are available with this article

Value of the Data •This data presents reflects changes in the BF assemblages in the key area of the global ocean termohaline circulation •The data are a comprehensive image collection representing common species of BF in the North Atlantic; the gallery can be used as a micropaleontological atlas, which helps to identify BF. Data may be useful in micropaleontology, taxonomy, paleoceanography. •The data are valuable for understanding the diversity of BF in the high northern latitudes of the Atlantic ocean.

1. Data

In this article, we present:

• -map of the North Atlantic showing location of the research stations as well as warm surface currents and cold deep currents (Fig. 1);
• -station list with geographic coordinates, sampling depth, and number of tests counted in the sample (Table 1);
• -list of BF taxa (Table 2);
• -microphotograph tables of benthic foraminifera for each station and taxonomic descriptions to them (Phototable 1, Phototable 2, Phototable 3, Phototable 4, Phototable 5, Phototable 6, Phototable 7, Phototable 8, Phototable 9, Phototable 10, Phototable 11, Phototable 12, Phototable 13, Phototable 14, Phototable 15, Phototable 16, Phototable 17, Phototable 18, Phototable 19, Phototable 20, Phototable 21, Phototable 22, Phototable 23, Phototable 24, Phototable 25, Phototable 26).

Fig. 1.

Map of the North Atlantic showing the location of stations. Red arrows denote warm surface currents, and blue arrows denote cold deep currents [10,11].

Table 1.

Station list with geographic coordinates, water depths, and the number of foraminiferal specimens counted in the sample.

Station No.	Depth (m)	Lat. (N)	Long. (W)	Total BF tests counted per 1 sample
AI3646	3346	55.0021°	−43.7569°	158
AI3639	3393	58.2180°	−54.1686°	368
AI3635	3477	59.1116°	−50.5108°	151
AI3629	2389	59.9664°	−47.0353°	152
AI3613	328	59.8962°	−42.3150°	399
AI3597	2399	59.5627°	−41.0077°	184
AI3593	2922	59.5028°	−39.3311°	193
AI3592	3156	59.4926°	−37.3242°	208
AI3586	3064	59.5039°	−34.9820°	159
AI3574	1531	59.5062°	−30.6606°	221
AI3568	1694	59.5009°	−28.6663°	199
AI3562	2237	59.4988°	−26.6601°	185
AI3556	2512	59.4977°	−24.7053°	157
AI3548	2740	59.4931°	−21.9865°	203
AI3545	2825	59.4984°	−20.6946°	160
AI3540	2182	59.5004°	−18.0003°	224
AI3534	1519	59.5028°	−15.3330°	294
AI3531	1291	59.5009°	−13.3339°	168
AI3527	1611	59.4991°	−11.3338°	209
AI3524	1468	59.4988°	−9.3336°	237
AI3521	1051	59.5001°	−7.3344°	323
AI3519	137	59.4996°	−6.0041°	295
AI3516	158	59.5001°	−3.8321°	422
AI3451	1150	61.0679°	−3.8666°	186
AI3464	484	62.7388°	−8.4601°	321
AI3485	567	64.0252°	−12.6182°	204

Table 2.

List of benthic foraminiferal taxa.

Benthic foraminiferal genera and species
Adercotryma glomeratum (Brady, 1878)
Alabaminella weddellensis (Earland, 1936)
Amphicoryna scalaris (Batsch, 1791)
Astrononion gallowayi Loeblich & Tappan, 1953 = Astrononion hamadaense Asano, 1950
Astrononion stelligerum (d'Orbigny, 1839)
Bolivina earlandi Parr, 1950
Bolivina pseudoplicata Heron-Allen & Earland, 1930
Bolivina pygmaea (Brady, 1881)
Bolivina sp. d'Orbigny, 1839
Brizalina subspinescens (Cushman, 1922)
Bulimina marginata d'Orbigny, 1826
Bulimina mexicana Cushman, 1922 = Bulimina striata d'Orbigny in Guérin-Méneville, 1832
Carpenteria balaniformis Gray, 1858
Cassidulina carinata Silvestri, 1896
Cassidulina laevigata d'Orbigny, 1826
Cassidulina reniforme Nørvang, 1945
Cassidulina teretis Tappan, 1951
Cassidulinoides bradyi (Norman, 1881) = Evolvocassidulina bradyi (Norman, 1881)
Cibicides refulgens Montfort, 1808
Cibicidoides bradyi (Trauth, 1918)
Cibicidoides lobatulus (Walker & Jacob, 1798)
Cibicidoides pachyderma (Rzehak, 1886)
Cibicidoides pseudoungeriana (Cushman, 1922)
Cibicidoides sp. Thalmann, 1939
Cibicidoides wuellerstorfi (Schwager, 1866)
Cribrostomoides subglobosus (Cushman, 1910)
Cyclammina pusilla Brady, 1881
Cystammina pauciloculata (Brady, 1879)
Eggerella bradyi (Cushman, 1911)
Elphidium excavatum subsp. clavatum Cushman, 1930
Elphidium incertum (Williamson, 1858) = Cribroelphidium incertum Williamson, 1858
Elphidium sp. Montfort, 1808
Elphidium subarcticum Cushman, 1944
Epistominella exigua (Brady, 1884)
Fissurina lacunata (Burrows & Holland, 1895) = Seguenzaella lacunata (Burrows & Holland, 1895)
Fissurina sp. Reuss, 1850
Fissurina squamosoalata (Brady, 1881) = Vasicostella squamosoalata (Brady, 1881)
Fissurina staphyllearia Schwager, 1866
Fursenkoina complanata (Egger, 1893)
Fursenkoina fusiformis (Williamson, 1858) = Stainforthia fusiformis (Williamson, 1858)
Fursenkoina pauciloculata (Brady, 1884)
Gavelinopsis praegeri (Heron-Allen & Earland, 1913)
Globocassidulina subglobosa (Brady, 1881)
Gyroidina orbicularis d'Orbigny in Parker, Jones & Brady, 1865
Gyroidina sp. d'Orbigny, 1826
Hansenisca soldanii (d'Orbigny, 1826)
Hansenisca sp. Loeblich & Tappan, 1987
Haynesina orbicularis (Brady, 1881)
Hoeglundina elegans (d'Orbigny, 1826)
Hyalinea balthica (Schröter in Gmelin, 1791)
Ioanella tumidula (Brady, 1884)
Islandiella helenae Feyling-Hanssen & Buzas, 1976
Karreriella bradyi (Cushman, 1911)
Karrerulina conversa (Grzybowski, 1901)
Karrerulina sp. Finlay, 1940
Lagenammina difflugiformis (Brady, 1879)
Lagenosolenia incomposita Patterson & Pettis, 1986 = Fissurina incomposita (Patterson & Pettis, 1986)
Laticarinina pauperata (Parker & Jones, 1865)
Lenticulina gibba (d'Orbigny, 1839)
Melonis barleeanus (Williamson, 1858)
Melonis pompilioides (Fichtel & Moll, 1798)
Melonis sp. Montfort, 1808
Miliolinella subrotunda (Montagu, 1803)
Nonionella auricula Heron-Allen & Earland, 1930
Nonionella sp. Rhumbler, 1949
Nonionella turgida (Williamson, 1858) = Nonionoides turgidus (Williamson, 1858)
Nonionoides grateloupii (d'Orbigny, 1839)
Oolina acuticosta (Reuss, 1862) = Homalohedra acuticosta (Reuss, 1862)
Oolina sp. d'Orbigny, 1839
Oolina squamosa (Montagu, 1803) = Favulina squamosa (Montagu, 1803)
Oridorsalis sp. Andersen, 1961
Oridorsalis umbonatus (Reuss, 1851)
Psammosphaera fusca Schulze, 1875
Pullenia bulloides (d'Orbigny, 1846)
Pullenia quinqueloba (Reuss, 1851)
Pullenia sp. Parker & Jones, 1862
Pyrgo murrhina (Schwager, 1866)
Pyrgo sp. Defrance, 1824
Pyrulina sp. d'Orbigny, 1839
Quinqueloculina arctica Cushman, 1933
Quinqueloculina seminula (Linnaeus, 1758)
Quinqueloculina sp. d'Orbigny, 1826
Recurvoidatus sp. Saidova, 1970
Reophax bradyi Brönnimann & Whittaker, 1980
Reophax dentaliniformis (Brady, 1881) = Nodulina dentaliniformis (Brady, 1881)
Reophax fusiformis (Williamson, 1858)
Robertinoides bradyi (Cushman & Parker, 1936)
Robertinoides sp. Höglund, 1947
Rosalina bradyi (Cushman, 1915)
Rosalina sp. d'Orbigny, 1826
Rosalina vilardeboana d'Orbigny, 1839 = Discorbis vilardeboanus (d'Orbigny, 1839)
Saccammina sphaerica Brady, 1871
Sigmoilopsis schlumbergeri (Silvestri, 1904)
Spiroplectinella wrightii (Silvestri, 1903)
Textularia sp. Defrance, 1824
Trifarina angulosa (Williamson, 1858)
Trifarina fluens (Todd in Cushman & McCulloch, 1948)
Trifarina sp. Cushman, 1923
Triloculina elongata d'Orbigny in Fornasini, 1905
Triloculina sp. d'Orbigny, 1826
Triloculina trihedra Loeblich & Tappan, 1953
Trochammina inflata (Montagu, 1808)
Uvigerina aculeata d'Orbigny, 1846
Uvigerina mediterranea Hofker, 1932
Uvigerina peregrina Cushman, 1923
Uvigerina sp. d'Orbigny, 1826

Phototable 1.

Station 3646

1Oridorsalis umbonatus, a spiral view, b umbilical view, c apertural view. 2Epistominella exigua, a spiral view, b umbilical view. 3Cibicidoides sp., a umbilical view, b spiral view. 4C. wuellerstorfi, a umbilical view, b spiral view. 5Pullenia quinqueloba, a side view, b apertural view. 6P. bulloides, a side view, b apertural view. 7Ionella tumidula, a spiral view, b umbilical view. 8Fursenkoina complanata. 9Eggerella bradyi, a apertural view, b lateral view. 10Karrerulina conversa. 11Cribrostomoides subglobosus. Scale 100 μm.

Phototable 2.

Station 3639

1Pullenia quinqueloba, a side view, b apertural view. 2Melonis pompilioides, a side view, b apertural view. 3Pullenia sp., a umbilical view, b apertural view. 4Oridorsalis umbonatus, a spiral view, b lateral view, c apertural view. 5Alabaminella weddellensis, a spiral view, b umbilical view. 6Epistominella exigua, a spiral view, b umbilical view. 7Cibicidoides pseudoungeriana, a umbilical view, b spiral view, c apertural view. 8C. wuellerstorfi, a umbilical view, b spiral view. 9Bolivina earlandi.10Uvigerina sp. 11Cribrostomoides subglobosus, a lateral view, b apertural view. 12 ?. 13 ?. 14Adercotryma glomeratum. 15Psammosphaera fusca. 16Karrerulina conversa. Scale 100 μm.

Phototable 3.

Station 3635

1Pullenia sp., a lateral view, b apertural view. 2Melonis pompilioides, a side view, b apertural view. 3Pullenia bulloides, a side view, b apertural view. 4Alabaminella weddellensis, a spiral view, b umbilical view, c lateral view. 5Epistominella exigua, a spiral view, b umbilical view. 6Cibicidoides wuellerstorfi, a umbilical view, b spiral view. 7Oridorsalis umbonatus, a spiral view, b umbilical view, c apertural view. 8Hansenisca? sp., a spiral view, b umbilical view, c apertural view. 9, 10Fursenkoina complanata, 9a apertural view, 9b lateral view, 10a lateral view, 10b apertural view. 11Trochammina inflata, a spiral view, b umbilical view. 12 ?. 13Lagenammina difflugiformis. 14Karrerulina conversa. Scale 100 μm.

Phototable 4.

Station 3629

1Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 2Hansenisca soldanii,a spiral view, b umbilical view, c apertural view. 3Oridorsalis sp., a spiral view, b umbilical view. 4Cibicidoides wuellerstorfi, a umbilical view, b spiral view. 5Elphidium incertum?. 6Astrononion stelligerum, a side view, b apertural view.7Pullenia quinqueloba,a side view, b apertural view. 8Cassidulina reniforme.9Globocassidulina subglobosa. 10Cassidulina laevigata. 11Alabaminella weddellensis, a spiral view, b umbilical view. 12Trifarina angulosa. 13Uvigerina aculeata. 14 ?. 15 ?. 16Trochammina inflata. 17 ?. Scale 100 μm.

Phototable 5.

Station 3613

1Melonis barleeanus,a side view, b apertural view. 2Pullenia bulloides. 3Robertinoides bradyi.4Rosalina sp. cf. R. vilardeboana?, a umbilical view, b spiral view. 5Alabaminella weddellensis, a spiral view, b umbilical view. 6Astrononion stelligerum, a, b side view. 7Elphidium subarcticum. 8Gavelinopsis praegeri, a spiral view, b umbilical view.9Cassidulina teretis, a apertural view, b lateral view. 10C. reniforme. 11Nonionella turgida, a lateral view, b apertural view. 12Nonionella sp.?. 13Cibicidoides sp. cf. C. pseudoungeriana?, a umbilical view, b spiral view, c apertural view. 14Cibicides refulgens,a umbilical view, b spiral view, c apertural view. 15Globocassidulina subglobosa.16Trifarina fluens,a, b lateral view. 17T. angulosa, a, b lateral view. 18Fissurina sp. 19F. squamosoalata. 20Oolina acuticosta. 21Quinqueloculina seminula. Scale 100 μm.

Phototable 6.

Station 3597

1Melonis barleeanus,a side view, b apertural view. 2Pullenia sp., a side view, b apertural view. 3Epistominella exigua, a spiral view, b umbilical view. 4Cassidulina teretis. 5Cibicidoides wuellerstorfi, a umbilical view, b spiral view, c apertural view. 6C. wuellerstorfi, a umbilical view, b spiral view. 7Hanseniska sp.?, a spiral view, b umbilical view. 8Alabaminella weddellensis, a spiral view, b umbilical view. 9Cassidulina reniforme. 10Globacassidulina subglobosa. 11Eggerella bradyi. 12Bolivina pseudoplicata. 13, 14Fissurina spp. 15Lagena sp. 16 ?, a, b side view. 17Trochammina inflata, a spiral view, b umbilical view. 18Saccammina sphaerica. 19Psammosphaera fusca. Scale 100 μm.

Phototable 7.

Station 3593

1Oridorsalis umbonatus, a spiral view, b umbilical view, c apertural view. 2Ioanella tumidula,a spiral view, b umbilical view. 3Epistominella exigua, a spiral view, b umbilical view. 4Alabaminella weddellensis, a spiral view, b umbilical view. 5Melonis sp. juvenile form? like st.3592 (9). 6Astrononion stelligerum, a side view, b apertural view. 7Pullenia quinqueloba, a side view, b apertural view. 8Nonionella auricula, a lateral view, b apertural view. 9Cassidulina laevigata, a apertural view, b lateral view. 10Cibicidoides wuellerstorfi, a umbilical view, b spiral view, c apertural view. 11Trifarina angulosa.12Fursenkoina complanata. 13F. fusiformis. 14Fissurina sp. 15Trochammina inflata. 16Karrerulina sp. 17Karrerulina conversa. Scale 100 μm.

Phototable 8.

Station 3592

1Hoeglundina elegans, a spiral view, b umbilical view, c lateral view. 2. Ioanella tumidula, a spiral view, b umbilical view, c lateral view. 3Cibicidoides sp. 4C. wuellerstorfi,a umbilical view, b spiral view, c apertural view. 5Epistominella exigua, a spiral view, b umbilical view. 6Alabaminella weddellensis, a spiral view, b umbilical view, c lateral view. 7Pullenia quinqueloba,a side view, b apertural view. 8. Nonionella auricula, a spiral view, b apertural view 9. Melonis sp. juvenile form?, lake st. 3593 (5), a side view, b apertural view. 10Oridorsalis umbonatus, a spiral view, b umbilical view, c lateral view. 11Triloculina trihedra, a lateral view, b apertural view. 12Fursenkoina complanata, a apertural view, b lateral view. 13Pyrulina sp. Scale 100 μm.

Phototable 9.

Station 3586

1Globocaccidulina subglobosa, a lateral view, b apertural view. 2, 3Oridorsalis umbonatus, a spiral view, b umbilical view, c apertural view. 4Melonis pompilioides, a side view, b apertural view. 5M. barleeanus,a side view, b apertural view. 6Hoeglundina elegans, a spiral view, b umbilical view. 7Epistominella exigua, a spiral view, b umbilical view. 8Cibicidoides wuellerstorfi,a umbilical view, b spiral view. 9C. lobatulus, a umbilical view, b spiral view, c apertural view. 10Fursenkoina complanata. 11Fissurina incomposita, 12Karreriella bradyi, a lateral view, b apertural view. 13Sigmoilopsis sp. 14 ?. Scale 100 μm.

Phototable 10.

Station 3574

1 Gavelinopsis praegeri. 2 Nonionella auricula, a spiral view, b umbilical view. 3 Cassidulinoides bradyi. 4 Robertinoides bradyi. 5 Globocassidulina subglobosa. 6 Cassidulina reniforme. 7 C. teretis, a apertural view, b lateral view. 8 C. teretis, a, b lateral view. 9, 10 Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 11 Pullenia quinqueloba, a side view, b apertural view. 12 Astrononion gallowayi. 13 Cibicidoides lobatulus, a umbilical view, b spiral view, c apertural view. 14 C. pachyderma, a umbilical view, b spiral view, c apertural view. 15 C. wuellerstorfi?, a umbilical view, b spiral view. 16 Trifarina angulosa. 17 Bulimina mexicana. 18 Triloculina sp. 19 Quinqueloculina sp., a lateral view, b apertural view. 20, 21 Fissurina spp. 22 F. lacunata. 23 Carpenteria balaniformis, a, b side view, c lateral view. 24 Eggerella bradyi, a apertural view, b lateral view. 25 Textularia sp. 26 Karreriella bradyi, a apertural view, b lateral view. 27 Sigmoilopsis schlumbergeri. Scale 100 μm.

Phototable 11.

Station 3568

1Gyroidina orbicularis, a spiral view, b umbilical view, c lateral view.2Gavelinopsis praegeri, a spiral view, b umbilical view. 3Cassidulina teretis, a lateral view, b apertural view. 4Alabaminella weddellensis, a spiral view, b umbilical view, c lateral view. 5 ? a, umbilical, b spiral view, c apertural view. 6Lenticulina gibba. 7Triloculina trihedraa, b lateral view. 8Pyrgo murrhina, a, b lateral view. 9Bulimina mexicana, a, b lateral view. 10Trifarina angulosa, a, b side view. 11Trifarina? sp., a, b side view. 12Sigmoilopsis schlumbergeri. Scale 100 μm.

Phototable 12.

Station 3562

1Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 2Epistominella exigua, a spiral view, b umbilical view. 3Alabaminella weddellensis, a spiral view, b umbilical view. 4Hoeglundina elegans. 5Cassidulina teretis, a apertural view, b lateral view. 6, 7Cibicidoides wuellerstorfi, a umbilical view, b spiral view, c apertural view. 8Pullenia bulloides, a side view, b apertural view. 9Melonis pompilioides, a side view, b apertural view. 10Fissurina sp. 11Pyrgo sp. 12Pyrgo murrhina. 13Recurvoidatus? sp., a umbilical view, b apertural view. 14Cystammina pauciloculata. Scale 100 μm.

Phototable 13.

Station 3556

1 ?, like 3548 (4), a spiral view, b umbilical view, c apertural view. 2Alabaminella weddellensis, a spiral view, b umbilical view. 3Epistominella exigua,a spiral view, b umbilical view. 4Nonionoides grateloupii,a spiral view, b umbilical view, c apertural view. 5Nonionella auricula, a umbilical view, b apertural view. 6Pullenia sp., a lateral view, b apertural view. 7Trifarina angulosa, a, b lateral view. 8Fursenkoina complanata, a apertural view, b lateral view. 9Lagena sp. 10Triloculina trihedra, a, b lateral view, c apertural view. 11Cystammina pauciloculata. 12Lagenammina difflugiformis. Scale 100 μm.

Phototable 14.

Station 3548

1Cibicidoides bradyi, a umbilical view, b spiral view, c apertural view. 2Alabaminella weddellensis,a spiral view, b umbilical view. 3Epistominella exigua,a spiral view, b umbilical view. 4 ?, like 3556 (1), a unbilical view, b spiral view, c apertural view. 5Melonis sp. cf. M. barleeanus, a side view, b apertural view. 6Pullenia sp., a side view, b apertutal view. 7P. bulloides, a side view, b apertural view. 8P. bulloides, a side view, b apertural view. 9Fursenkoina complanata.10Fissurina staphyllearia. 11Lagenammina difflugiformis.12Reophax fusiformis?. Scale 100 μm.

Phototable 15.

Station 3545

1Laticarinina pauperata. 2Pullenia sp., a lateral view, b apertural view. 3Melonis pompilioides, a side view, b apertural view. 4Pullenia bulloides, a side, b apertural view. 5Hansenisca soldanii,a spiral view, b umbilical view, c apertural view. 6Cibicidoides wuellerstorfi,a umbilical view, b spiral view, c apertural view. 7Epistominella exigua, a spiral view, b umbilical view. 8Lagena sp. 9Fissurina sp. 10Fursenkoina complanata. 11Trifarina angulosa; 12Triloculina elongata13Quinqueloculina sp. cf. Q. arctica, a lateral view, b apertural view. 14Cystammina pauciloculata. 15Sigmoilopsis schlumbergeri. 16Reophax dentaliniformis?. 17Psammosphaera fusca. 18Lagenammina difflugiformis. Scale 100 μm.

Phototable 16.

Station 3540

1Oridorsalis umbonatus, a spiral view, b umbilical view, c apertural view. 2Epistominella exigua,a spiral view, b umbilical view. 3Alabaminella weddellensis, a spiral view, b umbilical view. 4Cassidulina reniforme, a apertural view, b lateral view. 5Cassidulina laevigata. 6Cibicidoides sp. cf. C. pachyderma?, a umbilical view, b spiral view, c apertural view. 7C. lobatulus, a umbilical view, b spiral view. 8Gavelinopsis praegeri,a spiral view, b umbilical view. 9Melonis barleeanus, a side view, b apertural view. 10Melonis pompilioides, a side view, b apertural view. 11, 12Pullenia bulloides, a side view, b apertural view. 13Nonionella sp. cf. Nonionella turgida, a lateral view, b apertural view. 14Nonionella auricula. 15Pyrgo sp. 16, 17Triloculina trihedra, a, b lateral view. 18Brizalina subspinescens. 19Bolivina earlandi. 20Bulimina mexicana. 21, 22Trifarina angulosa. Scale 100 μm.

Phototable 17.

Station 3534

1Globacassidulina subglobosa, a, lateral view, b apertural view. 2Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 3Oridorsalis umbonatus?, a spiral view, b umbilical view, c apertural view. 4Gavelinopsis praegeri,a spiral view, b umbilical view. 5Alabaminella weddellensis, a spiral view, b umbilical view. 6Epistominella exigua,a spiral view, b umbilical view. 7Nonionella auricula. 8Cibicidjides lobatulus?, a umbilical view, b spiral view. 9, 10Cassidulina laevigata. 11C. teretis. 12, 13, 14, 15Trifarina angulosa. 16Bolivina earlandi. Scale 100 μm.

Phototable 18.

Station 3531

1Hansenisca soldanii,a spiral view, b umbilical view, c apertural view. 2Cibicidoides bradyi, a umbilical view, b spiral view, c apertural view. 3Cassidulina laevigata, a apertural view, b lateral view. 4C. teretis. 5Globocassidulina subglobosa, a, b apertural view. 6Gavelinopsis praegeri,a spiral view, b umbilical view, c lateral view. 7Pullenia bulloides, a side view, b apertural view. 8Elphidium excavatum, a, b side view. 9Oolina squamosa. 10, 11Fissurina spp., a side view, b apertural view. 12Brizalina subspinescens.13, 14Trifarina angulosa. 15Uvigerina peregrina. 16Sigmoilopsis schlumbergeri. 17Trochammina inflata. Scale 100 μm.

Phototable 19.

Station 3527

1Cibicidoides sp. cf. C. lobatulus, a umbilical view, b spiral view, c apertural view. 2C. lobatulus, a umbilical view, b spiral view, c apertural view. 3C. wuellerstorfi, a umbilical view, b spiral view. 4C. bradyi, a umbilical view, b spiral view, c apertural view. 5Melonis sp. 6Melonis barleeanus,a side view, b apertural view. 7Pullenia bulloides, a side view, b apertural view. 8Cassidulina reniforme, a apertural view, b lateral view. 9C. teretis, a lateral view, b apertural view. 10Globocassidulina subglobosa. 11Elphidium excavatum, a lateral view, b apertural view. 12Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 13Alabaminella weddellensis, a spiral view, b umbilical view. 14Fissurina squamosoalata. 15Bolivina earlandi.16Bulimina mexicana. 17Trifarina angulosa. 18T. fluens.19Uvigerina sp. 20Uvigerina sp. cf. U. mediterranea.21Cyclammina pussila, a lataral view, b apertural view. 22Saccamimina sphaerica. 23Lagenammina difflugiformis. 24 ?. 25Sigmoilopsis schlumbergeri. Scale 100 μm.

Phototable 20.

Station 3524

1Cibicidoides sp. juvenile form for C. lobatulus?, a umbilical view, b spiral view, c apertural view. 2Cibicides refulgens, a umbilical view, b spiral view, c apertural view. 3Cibicidoides sp., a umbilical view, b spiral view. 4Cibicidoides sp., a umbilical view, b spiral view. 5 ?, a lateral view, b apertural view. 6Elphidium excavatum, a umbilical view, b spiral view. 7Nonionella auricula,a lateral view, b apertural view. 8Cassidulina teretis, a apertural view, b lateral view. 9C. reniforme. 10Epistominella exigua, a spiral view, b umbilical view. 11Alabaminella weddellensis, a spiral view, b umbilical view. 12Gavelinopsis praegeri, a spiral view, b umbilical view. 13Oridorsalis sp. cf. O. umbonatus, a spiral view, b umbilical view, c apertural view. 14Fissurina staphyllearia. 15Fissurina sp. 16Bulimina mexicana. 17, 18Fursenkoina fusiformis. 19F. pausiloculata. 20Fursenkoina sp. cf. F. complanata. 21Brizalina subspinescens. 22Bolivina sp. 23, 24, 25Trifarina angulosa. 26Uvegerina peregrina. 27Bolivina pseudoplicata. 28Sigmoilopsis schlumbergeri. 29Reophax bradyi.30Psammosphaera fusca. Scale 100 μm.

Phototable 21.

Station 3521

1Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 2Cibicidoides bradyi, a umbilical view, b spiral view, c apertural view. 3Gavelinopsis praegeri,a spiral view, b umbilical view. 4Cassidulina laevigata, a apertural view, b lateral view. 5C. laevigata. 6C. reniforme, a apertural view, b lateral view. 7C. laevigata, a apertutal view, b lateral view. 8Elphidium subarcricum.9E. excavatum?,a side view, b apertural view. 10Melonis? sp. 11Epistominella exigua,a spiral view, b umbilical view. 12Alabaminella weddellensis, a spiral view, b umbilical view. 13Nonionella auricula. 14N. turgida, a lateral view, b aperural view. 15Nonionella sp., a spiral view, b umbilical view. 16N. auricula,a lateral view, b apertutal view. 17Globocassidulina subglobosa. 18Robertinoides sp., a apertural view, b lateral view. 19Pyrgo murrhina.20Triloculina elongata. 21Bolivina earlandi.22Bolivina sp. 23Bolivina sp. 24 Bolivina sp. 25Brizalina subspinescens. 26Bolivina pygmae.27Fursenkoina complanata. 28F. fusiformis. 29Oolina squamosa30Spiroloculina tenuiseptata.31Trifarina angulosa.32Uvigerina peregrina. 33Uvigerina sp. 34Cribrostomoides subglobosus, a side view, b apertural view. 35 ?, a side view, d apertural view. 36Eggerella bradyi. 37Sigmoilopsis schlumbergeri. 38Psammosphaera fusca. 39Lagenammina difflugiformis. Scale 100 μm.

Phototable 22.

Station 3519

1 Rosalina vilardeboana, a spiral view, b umbilical view. 2 Cassidulina laevigata, a lateral view, b apertural view. 3 Islandiella helenae. 4 Cassidulina teretis. 5 C. reniforme. 6, 7 Globocassidulina subglobosa. 8 Rosalina bradyi, a spiral view, b umbilical view. 9 Cibicidoides sp. cf. C. pseudoungeriana, a umbilical view, b spiral view, c apertural view. 10 Cibicides refulgens, a umbilical view, b spiral view, c apertural view. 11 Cibicidoides pachyderma, a umbilical view, b spiral view. 12 Pyrgo sp. 13 ?. 14 Bulimina marginata. 15 Trifarina angulosa. 16 T. fluens. 17 Oolina sp. 18 O. squamosa. 19 Spiroplectinella wrightii. Scale 100 μm.

Phototable 23.

Station 3516

1Nonionella auricula,a umbilical view, b spiral view. 2N. turgida, a lateral view, b umbilical view. 3Cassidulina carinata, a latereal view, b apertural view. 4C. laevigata,a lateral view, b apertural view. 5C. reniforme, a apertural view, b lateral view. 6Hyalinea balthica. 7 ?. 8, 9Rosalina vilardeboana, a spiral view, b umbilical view. 10Pyrgo sp. 11Quinqueloculina seminula, a lataral view, b apertural view. 12Miliolinella subrotunda, a lataral view, b apertural view. 13Bulimina marginata. 14Trifarina angulosa. 15Fursenkoina fusiformis. 16Amphicoryna scalaris, a lataral view, b apertural view. 17Bolivina sp. Scale 100 μm.

Phototable 24.

Station 3451

1Cassidulina laevigata, a apertural view, b,c lateral view?. 2 C. laevigata. 3C. teretis. 4Cassidulina sp., a apertural view, b lateral view. 5, 6C. reniforme, a apertural view, b lateral view. 7Elphidium sp. cf. E. excavatum, a lateral view, b apertural view. 8E. excavatum.9Melonis barleeanus,a side view, b apertural view. 10Pullenia bulloides, a side view, b apertural view. 11Pyrgo sp. 12Triloculina tricarinata, a lateral view, b apertural view. 13Trifarina angulosa. 14Lagenammina difflugiformis. 15 ?. 16Psammosphaera fusca. Scale 100 μm.

Phototable 25.

Station 3464

1Elphidium excavatum, a lateral view, b apertural view. 2Pullenia bulloides, a side view, b apertural view. 3Melonis barleeanus,a side view, b apertural view. 4Cibicidoides sp., a spiral view, b umbilical view. 5Cibicidoides sp., a spiral view, b umbilical view. 6C. lobatulus, a umbilical view, b spiral view. 7Cibicides refulgens, a umbilical view, b spiral view, c apertural view. 8C. wuellerstorfi, a umbilical view, b spiral view, c apertural view. 9Cassidulina laevigata, a apertural view, b lateral view. 10C. teretis, a apertural view, b lateral view. 11Globocassidulina subglobosa. 12Rosalina sp., a spiral view, b umbilical view. 13Fissurina sp. 14Trifarina angulosa. 15Bolivina earlandi. Scale 100 μm.

Phototable 26.

Station 3485

1Pullenia bulloides, a side view, b apertural view. 2 ?, a lateral view, b apertural view. 3Cassidulina teretis, a apertural view, b lateral view. 4C. laevigata, a, b lateral view. 5Globocassidulina subglobosa,a apertural view, b lateral view. 6G. subglobosa,a lateral view, b apertural view. 7Gyroidina orbicularis, a spiral view, b umbilical view, c apertural view. 8Cibicidoides sp., a umbilical view, b spiral view, c apertural view. 9, 10Cibicides refulgens, a umbilical view, b spiral view, c apertural view.11Cibicidoides lobatulus, a umbilical view, b spiral view, c apertural view. 12Bolivina earlandi. 13, 14Trifarina angulosa. 15Eggerella bradyi. Scale 100 μm.

2. Experimental design, materials, and methods

For the for micropaleontological analysis, we used the surface sediments (0–2 cm) from 26 grab sampler (Van-Veen type) station, obtained during the 51st cruise of the RV Akademik Ioffe (AI) in the summer 2016 (Fig. 1, Table 1). Then, the samples were weighed, dried and washed with distilled water through a sieve with a mesh size of 63 μm. We used a sediment fraction of 63 μm to retain such small species as Epistominella exigua and Alabaminella weddellensis [[1], [2], [3], [4]]. The identification of living foraminifera was not carried out. Further, the identification and counting was made at least 150 per one sample for benthic tests [5] (Table 2). Species definition was based on publications of Jones [6], Feyling-Hanssen [7], Atlas of Benthic Foraminifera [8], Saidova [9]. Photos were made using a Nikon microscope SMZ25 equipped with a Nikon camera DS-Fi3 and NIS-Elements D software. Microphotograph tables were made in the computer program CorelDRAW12.

Conflict of Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.