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782 results for “abyss”
FIGURE 8 in Description and distribution of Erebussau nom. nov. pro Erebus Bussau, 1993 nec Erebus Latreille, 1810 with description of a new specie, and of Odetenema gesarae gen. nov., sp. nov. (Nematoda: Desmoscolecida) from nodule-bearing abyssal sediments in the Pacific
FIGURE 8: Distribution of Odetenema gesarae gen. nov., sp. nov. Imagery reproduced from the GEBCO Grid, version 1.3.0, ETOPO1 Global Relief Model (Amante & Eakins, 2009)
FIGURE 3 in Description and distribution of Erebussau nom. nov. pro Erebus Bussau, 1993 nec Erebus Latreille, 1810 with description of a new specie, and of Odetenema gesarae gen. nov., sp. nov. (Nematoda: Desmoscolecida) from nodule-bearing abyssal sediments in the Pacific
FIGURE 3: Erebussau tenebricosus nom. nov., comb. nov. (Drawings of specimens code: Male 1 and Female 1) A: male habitus, arrow pointing towards phasmata; B: male anterior end, arrows pointing towards pseudocoelomocyte and pigment spot; C: female anterior end, arrows pointing towards pointing towards pseudocoelomocytes; D: female reproductive system; (Scale bars: A, B, C, D = 20 µm)
FIGURE 5 in Description and distribution of Erebussau nom. nov. pro Erebus Bussau, 1993 nec Erebus Latreille, 1810 with description of a new specie, and of Odetenema gesarae gen. nov., sp. nov. (Nematoda: Desmoscolecida) from nodule-bearing abyssal sediments in the Pacific
FIGURE 5: Distribution of Erebussau profundus sp. nov. Imagery reproduced from the GEBCO Grid, version 1.3.0, ETOPO1 Global Relief Model (Amante & Eakins, 2009)
FIGURE 4 in Description and distribution of Erebussau nom. nov. pro Erebus Bussau, 1993 nec Erebus Latreille, 1810 with description of a new specie, and of Odetenema gesarae gen. nov., sp. nov. (Nematoda: Desmoscolecida) from nodule-bearing abyssal sediments in the Pacific
FIGURE 4: Erebussau tenebricosus nom. nov., comb. nov. (Photos of specimens code: Male 1 and Female 1) A: male habitus, arrow pointing towards pigment spots; B: male anterior end, arrow pointing towards pseudocoelomocyte; C: female reproductive system, arrow pointing towards ovary reflected end; D: male posterior end, tail pointing towards apophysis; E: female anterior end; F: female tail showing phasmata; (Scale bars A = 50 µm, B, C, D, E, F = 20 µm)
FIGURE 1 in Description and distribution of Erebussau nom. nov. pro Erebus Bussau, 1993 nec Erebus Latreille, 1810 with description of a new specie, and of Odetenema gesarae gen. nov., sp. nov. (Nematoda: Desmoscolecida) from nodule-bearing abyssal sediments in the Pacific
FIGURE 1: Clarion-Clipperton Fracture Zone (CCFZ) showing the studied license areas of the Polymetallic Nodules Programme (PMN) and the Peru Basin. Imagery reproduced from the GEBCO Grid, version 1.3.0, www.gebco.net.
FIGURE 2 in Description and distribution of Erebussau nom. nov. pro Erebus Bussau, 1993 nec Erebus Latreille, 1810 with description of a new specie, and of Odetenema gesarae gen. nov., sp. nov. (Nematoda: Desmoscolecida) from nodule-bearing abyssal sediments in the Pacific
FIGURE 2: Distribution of Erebussau tenebricosus nom. nov., comb. nov. Imagery reproduced from the GEBCO Grid, version 1.3.0, ETOPO1 Global Relief Model (Amante & Eakins, 2009)
Data from: Abyssal benthic foraminifera in the eastern equatorial Pacific (IODP Exp 320) during the middle Eocene
We report on the faunal transition of benthic foraminifera during the middle Eocene at Site U1333 (4862 m water depth, 3560-3720 m paleo-water depth) of Integrated Ocean Drilling Program Expedition 320 in the eastern equatorial Pacific Ocean. During the period ~41.5-40.7 Ma, which includes carbonate accumulation event 3 (CAE-3), the benthic foraminiferal accumulation rate (BFAR) increased gradually and then it declined rapidly. In contrast, BFAR was considerably lower during ~40.7-39.4 Ma, corresponding to the middle Eocene climatic optimum (MECO), and then it increased during ~39.3-38.4 Ma, including CAE-4. Diversity (E [S200]) was slightly lower in the upper part of the study interval than in the lower part. The most common benthic foraminifera were Nuttallides truempyi, Oridorsalis umbonatus and Gyroidinoides spp. in association with Globocassidulina globosa and Cibicidoides grimsdalei during the period studied. Quadrimorphina profunda occurred abundantly with N. truempyi, O. umbonatus and G. globosa during ~39.4-38.4 Ma, including CAE-4, although this species was also relatively common in the lower part of the study interval. Virgulinopsis navarroanus and Fursenkoina sp. A, morphologically infaunal taxa, were common during ~38.8-38.4 Ma, corresponding to the late stage of CAE-4. Based on Q-mode cluster analysis, four sample clusters were recognized and their stratigraphic distributions were generally discriminated in the lower and upper parts of the study interval.. Thus, there was only a small faunal transition in the abyssal eastern equatorial Pacific during the middle to late-middle Eocene. The faunal transition recognized in this study may be related to recovery processes following intense carbonate corrosiveness in the eastern equatorial Pacific during MECO.
Data from: Can the source-sink hypothesis explain macrofaunal abundance patterns in the abyss? A modeling test
Low food availability is a major structuring force in deep-sea benthic communities, sustaining only very low densities of organisms in parts of the abyss. These low population densities may result in an Allee effect, whereby local reproductive success is inhibited, and populations are maintained by larval dispersal from bathyal slopes. This slope–abyss source–sink (SASS) hypothesis suggests that the abyssal seafloor constitutes a vast sink habitat with macrofaunal populations sustained only by an influx of larval 'refugees' from source areas on continental slopes, where higher productivity sustains greater population densities. Abyssal macrofaunal population densities would thus be directly related to larval inputs from bathyal source populations. We evaluate three predictions derived from the SASS hypothesis: (i) slope-derived larvae can be passively transported to central abyssal regions within a single larval period, (ii) projected larval export from slopes to the abyss reproduces global patterns of macrofaunal abundance and (iii) macrofaunal abundance decreases with distance from the continental slope. We find that abyssal macrofaunal populations are unlikely to be sustained solely through influx of larvae from slope sources. Rather, local reproduction probably sustains macrofaunal populations in relatively high-productivity abyssal areas, which must also be considered as potential larval source areas for more food-poor abyssal regions.
The Abyss
Painted The Abyss in Tiltbrush, from the amazing Pietro Canonica Source: Objaverse 1.0 / Sketchfab
FIGURE 4 in Mesosignum weddellensis sp. nov. (Crustacea: Asellota: Mesosignidae), a new isopod species from the abyssal Weddell Sea, Antarctica
FIGURE 4, Mesosignum weddellensis sp. nov., holotype ɗ (2.0 mm). a, pereopod 6; b, pereopod 3; c, first pleopod; d, second pleopod; e, left uropod. Scale bar = 0.1 mm.
FIGURE 3 in Mesosignum weddellensis sp. nov. (Crustacea: Asellota: Mesosignidae), a new isopod species from the abyssal Weddell Sea, Antarctica
FIGURE 3, Mesosignum weddellensis sp. nov., holotype ɗ (2.0 mm). a, pereopod 1; b, pereopod 2; c, pereopod 4; d, pereopod 5; e, pereopod 7. Scale bar = 0.1 mm.
FIGURE 2 in Mesosignum weddellensis sp. nov. (Crustacea: Asellota: Mesosignidae), a new isopod species from the abyssal Weddell Sea, Antarctica
FIGURE 2, Mesosignum weddellensis sp. nov., holotype (2.0 mm). a, left mandible; b, right mandible; c, maxillule; d, maxilla; e, maxilliped. Scale bar = 0.1 mm.
FIGURE 1 in Mesosignum weddellensis sp. nov. (Crustacea: Asellota: Mesosignidae), a new isopod species from the abyssal Weddell Sea, Antarctica
FIGURE 1, Mesosignum weddellensis sp. nov., holotype ɗ (2.0 mm). a, dorsal view. Scale bar = 1 mm, b, antennule; c, antenna. Scale bar = 0.1 mm.
FIGURES 1–6 in Tractolira delli, a new Volutidae (Mollusca: Gastropoda: Neogastropoda) from the abyssal plains off Antarctica
FIGURES 1–6. Shells of Tractolira species. 1, 2, 5. Tractolira delli new species. 1. Holotype, USNM 860631, 52.4 mm length (broken shell), Scott Island Bank, eastern Ross Sea, Antarctica, 69º03'–69º05' S, 179º41'– 179º22' E, 3519–3596 m. Scale bar = 20 mm. 2. Paratype 1, off Victoria Land, Antarctica, USNM 860632, 72º58'–72º57' S, 174º24'–174º25' E. Scale bar = 10 mm. 5. Paratype 1, detail of shell surface on penultimate whorl. Scale bar = 1 mm. 3. Tractolira sparta Dall, 1896, holotype, USNM 122999, 60.0 mm length, USNS ALBATROSS station 3360, 24 Feb. 1891,"Gulf of Panama to Acapulco", Mexico. 4, 6. Tractolira germonae Harasewych, 1987. 4. Holotype, USNM 859076, 59.1 mm length, east of Candlemas Island, South Sandwich Islands. Scale bar = 20 mm. 6. USNM 860623, detail of shell surface on penultimate whorl. Scale bar = 1 mm.
FIGURES 7–9 in Tractolira delli, a new Volutidae (Mollusca: Gastropoda: Neogastropoda) from the abyssal plains off Antarctica
FIGURES 7–9. Radulae of Tractolira species, dorsal and 45 oblique views. 7. Tractolira delli new species, holotype, USNM 860631. 8. Tractolira sparta Dall, 1896, SIO M1639, off Ensenada, Baja California Norte, Mexico. 9. Tractolira germonae Harasewych, 1987, USNM 881012, off South Sandwich Islands. Scale bars = 200 m.
FIGURE 5 in Three new minute nematode species of the superfamily Monhysteroidea from Arctic Abyss
FIGURE 5. Thalassomonhystera molloyensis sp. n. A male N1, entire; B female N1, entire; C male N1, cephalic end; D female N1, cephalic end. Scale bars: A, B 50 µm; C, D 10 µm.
FIGURE 2 in Three new minute nematode species of the superfamily Monhysteroidea from Arctic Abyss
FIGURE 2. Amphimonhystrella bullacauda sp. n., further details. A: male N1, entire. B: female N1, entire; C: male N1, anterior body; D: male N1, posterior body; E female N1, genital branch. Scale bars: A, B 100 µm; C– E 20 µm.
FIGURE 1 in Three new minute nematode species of the superfamily Monhysteroidea from Arctic Abyss
FIGURE 1. Amphimonhystrella bullacauda sp. n., cephalic ends. A: male N1. B: male N2. C: female N1. Scale bars 10 µm.
FIGURE 4 in Three new minute nematode species of the superfamily Monhysteroidea from Arctic Abyss
FIGURE 4. Thalassomonhystera oxycephalata sp. n., female N2. A entire; B cephalic end; C genital branch. Scale bars: A 100 µm; B 10 µm; C 50 µm.
FIGURE 3 in Three new minute nematode species of the superfamily Monhysteroidea from Arctic Abyss
FIGURE 3. Thalassomonhystera oxycephalata sp. n., male N1. A entire; B cephalic end; C posterior body. Scale bars: A 100 µm; B, C 10 µm.
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