scholarly journals The Structure of the Columellar Muscle System in Clio Pyramidata and Cymbulia Peroni (Theocosomata, Gastropoda)

1979 ◽  
Vol 48 (2) ◽  
pp. 111-126 ◽  
Author(s):  
Trudy Pafort-van Iersel ◽  
S. van der Spoel
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
Larval Stage ◽  
North Atlantic Ocean ◽  
Phylogenetic Relation ◽  
Muscle System ◽  
The North ◽  
The North Atlantic ◽  
The Asymmetry ◽  
The Mediterranean

The phylogenetic relation between Clio pyramidata Linnaeus, 1767, and Cymbulia peroni De Blainville, 1818, has been studied with regard to the structure of their muscle systems. Specimens of both species collected from the North Atlantic Ocean and the Mediterranean were sectioned 5 μm thick and stained with Haematoxilin-Eosin, Crossmon or Azan for histological purposes or they were studied as cleared dissected or entire animals. The columellar muscle and subectodermal wing muscles of both species are described. It is concluded that Clio shows neoteny since it develops without metamorphosis. The asymmetry in anatomy proves that both Clio and Cymbulia descend from spiralised ancestors. For Clio two primitive characters are discussed which may be due to the “larval stage” of the adult but which also affirm the possible relation of molluscs to a coelenterate-like ancestor. Original structures found in Cymbulia are also discussed in the light of a possible phylogenetic relation between Thecosomata and Coelenterata, more in particular Conulata.

Discospirina (Miliolina, Foraminiferida) from the Coral Sea off northeastern Australia: a new record

1991 ◽  
Vol 65 (2) ◽  
pp. 332-334 ◽  
Author(s):  
George C. H. Chaproniere
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Mediterranean Area ◽  
Anterior Wall ◽  
The North ◽  
Coral Sea ◽  
Initial Stage ◽  
The North Atlantic ◽  
The Mediterranean

Discospirina is a milioline genus previously recorded as fossil only from the Miocene to Pleistocene of the Mediterranean, and is found living in the same area and into the North Atlantic Ocean (Adams, 1959, 1967, 1973; Adams etal., 1983; Radford, 1976). It is readily recognized by its large, fragile, very thin test, with annular chambers surrounding a coiled initial stage; the concentric chambers are subdivided by numerous internal septa that fall short of the anterior wall of each chamber (Adams, 1959). The specimens illustrated by Brady (1884, PI. 65, figs. 6, 7) from the Atlantic Ocean were referred to Discospirina tenuissima by Barker (1960), but Adams (1959) considered this to be a junior synonym for D. italica, giving the species a range from late Miocene to Recent. Adams (1959) noted that there were more septa per annular chamber in the Recent than in the fossil forms from the Mediterranean area, and the Coral Sea forms appear to resemble the Miocene ones in this respect.

scholarly journals Hydrological relationship between the North Atlantic Ocean and the Mediterranean Sea during the past 15-75 kyr

1999 ◽  
Vol 14 (5) ◽  
pp. 626-638 ◽  
Author(s):  
Martine Paterne ◽  
Nejib Kallel ◽  
Laurent Labeyrie ◽  
Maryline Vautravers ◽  
Jean-Claude Duplessy ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
The Past ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean

scholarly journals Extreme waves and climatic patterns of variability in the eastern North Atlantic and Mediterranean basins

Ocean Science ◽  
2020 ◽  
Vol 16 (6) ◽  
pp. 1385-1398
Author(s):  
Verónica Morales-Márquez ◽  
Alejandro Orfila ◽  
Gonzalo Simarro ◽  
Marta Marcos
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Extreme Waves ◽  
Extreme Wave ◽  
East Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean

Abstract. The spatial and temporal variability of extreme wave climate in the North Atlantic Ocean and the Mediterranean Sea is assessed using a 31-year wave model hindcast. Seasonality accounts for 50 % of the extreme wave height variability in the North Atlantic Ocean and up to 70 % in some areas of the Mediterranean Sea. Once seasonality is filtered out, the North Atlantic Oscillation and the Scandinavian index are the dominant large-scale atmospheric patterns that control the interannual variability of extreme waves during winters in the North Atlantic Ocean; to a lesser extent, the East Atlantic Oscillation also modulates extreme waves in the central part of the basin. In the Mediterranean Sea, the dominant modes are the East Atlantic and East Atlantic–Western Russia modes, which act strongly during their negative phases. A new methodology for analyzing the atmospheric signature associated with extreme waves is proposed. The method obtains the composites of significant wave height (SWH), mean sea level pressure (MSLP), and 10 m height wind velocity (U10) using the instant when specific climatic indices have a stronger correlation with extreme waves.

scholarly journals Extreme waves and climatic patterns of variability in the Eastern North Atlantic and Mediterranean basins

2020 ◽  
Author(s):  
Verónica Morales-Márquez ◽  
Alejandro Orfila ◽  
Gonzalo Simarro ◽  
Marta Marcos
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Extreme Waves ◽  
Extreme Wave ◽  
East Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean

Abstract. The spatial and temporal variability of extreme wave climate in the North Atlantic Ocean and the Mediterranean Sea is assessed using a 31-year wave model hindcast. Seasonality accounts for 50 % of the extreme wave height variability in North Atlantic Ocean and up to 70 % in some areas of the Mediterranean Sea. Once seasonality is filtered out, the North Atlantic Oscillation and the Scandinavian Index are the dominant large-scale atmospheric patterns that control the interannual variability of extreme waves during winters in the North Atlantic Ocean; and to a lesser extent, the East Atlantic Oscillation also modulates extreme waves in the central part of the basin. In the Mediterranean Sea, the dominant modes are the East Atlantic and East Atlantic/Western Russia modes which act strongly during their negative phases.

scholarly journals <i>Syracosphaera noroiticus</i> sp. nov., and <i>S. marginaporata</i> sp. nov., (Syracosphaeraceae, Prymnesiophyta), new coccolithophorids from the Mediterranean Sea and North Atlantic Ocean

1993 ◽  
Vol 12 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Michael Knappertsbusch
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Undescribed Species ◽  
The North ◽  
The North Atlantic ◽  
The Mediterranean ◽  
Eastern North Atlantic ◽  
Scanning Electron

Abstract. During scanning electron microscope investigations of living coccolithophorids from the Mediterranean Sea and the North Atlantic Ocean, two hitherto undescribed species of the genus Syracosphaera Lohmann, 1902 emend. Gaarder (in Gaarder and Heimdal, 1977) were found. The first species, Syracosphaera noroiticus sp. nov., was recorded in the Gulf of Lyons (Mediterranean Sea), and the second, S. marginaporata sp. nov., was found in the eastern North Atlantic.

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