Dentoglobigerina is a diverse genus of planktonic foraminifera ranging from the Eocene to Recent. However, ancestry has been controversial. A growing body evidence indicates that was spinose in life and evolved Subbotina, whilst others have suggested its origins stem Acarinina. Here we explore whether Subbotina or Acarinina ancestor by examining 35 specimens, evaluating their morphology occurre...

In the tropical Atlantic, planktonic fomminfera species are vertically distributed with highest abundances occunfng in the photic zone (approximately 0-100 m). The tropical Atlantic thermocline dips from east to west and varies seasonally due to changes in the southeast and northeast trade winds. In the east, the thermocline is in the photic zone, and in the west, the well-mixed surface layer e...

The sulfur content of planktonic and benthic foraminifera was measured in specimens recovered from deep-sea sediment cores and individuals grown in culture. A new method for measuring sulfur in foraminiferal calcium carbonate was developed, employing a high-resolution inductively coupled plasma-mass spectrometer. The sulfur measurements, expressed as sulfur-to-calcium (S/Ca) ratios in the foram...

Evidence of increasing concentrations of dissolved carbon dioxide, especially in the surface ocean and its associated impacts on calcifying organisms, is accumulating. Among these organisms, benthic and planktonic foraminifera are responsible for a large amount of the globally precipitated calcium carbonate. Hence, their response to an acidifying ocean may have important consequences for future...

Planktonic Foraminifera are ubiquitous marine protozoa inhabiting the upper ocean. During life, they secrete calcareous shells, which accumulate in sediments, providing a geological record of past spatial and temporal changes their community structure. As result, provide opportunity to analyze both current historical patterns species distribution turnover this plankton group on global scale. Th...

Abstract Planktonic foraminifera were studied at Lydden Spout, near Folkestone (southeast England, UK), the reference section of middle Cenomanian Event 1 (MCE 1) characterized by a prominent double-peak ? 13 C excursion ‰ identified in different ocean basins and considered global event. Biostratigraphic quantitative analysis planktonic are correlated to perturbation, positive 18 O shifts withi...

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