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Globigerina
''Globigerina'' () is a genus of planktonic Foraminifera, in the order of Rotaliida.Globigerina World Foraminifera Database, accessed 3 December 2018 It has populated the world's oceans since the Middle Jurassic. ''Globigerina'' ooze Vast areas of the ocean floor are covered with ''Globigerina'' Pelagic sediments, ooze, dominated by the foraminiferous shells of ''Globigerina'' and other Globigerinina. The name was originally applied to mud collected from the bottom of the Atlantic Ocean when planning the location of the first transatlantic telegraph cables and it was mainly composed of the shells of ''Globigerina bulloides''.Description ''Globigerina'' is a marine microorganism characterized by its spherical, coiled shell known as a test (biology), test. The t ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globigerina Bulloides
''Globigerina bulloides'' is a species of heterotrophic planktonic foraminifer with a wide distribution in the photic zone of the world's oceans. It is able to tolerate a range of sea surface temperatures, salinities and water densities, and is most abundant at high southern latitudes (up to 40° S), certain high northern latitudes (up to 80° N), and in low-latitude upwelling regions. The density or presence of ''G. bulloides'' may change as a function of phytoplankton bloom successions, and they are known to be most abundant during winter and spring months. Like other planktonic foraminifera, ''G. bulloides'' carbonate tests found in marine sediments obtained from ocean cores can be used to reconstruct climatic histories, and to align marine sediment cores with one another or with astronomical cycles. In this vein, oxygen isotopic analyses of these forams from drill cores in the North Atlantic have helped precisely date the timing of the onset of northern hem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globigerinina
The Globigerinina is a suborder of foraminiferans that are found as marine plankton. They produce hyaline calcareous Test (biology), tests, and are known as fossils from the Jurassic period onwards. The group has included more than 100 genera and over 400 species, of which about 30 species are extant. One of the most important genera is ''Globigerina''; vast areas of the ocean floor are covered with ''Globigerina'' Pelagic sediments, ooze (named by Murray and Renard in 1873), dominated by the shells of planktonic forms. Description Globigerinids are characterized by distinctly perforate planispiral or trochospiral tests composed of lamellar radial hyaline (glassy) calcite, with typically globular chambers and single interiomarginal aperture. Some however have multiple or auxiliary apertures, and in some the aperture is areal or terminal in location. Some, also, have keels, reinforcing thickenings along exterior angles. An adaptation to the planktonic habit is the development o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |