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Globigerina |
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Globigerina
a genus of protozoan animals of the order Foraminifera of the class Rhizopoda. The porous calcareous shell of Globigerina consists of several interconnected, spherical chambers. The surfaces of the chambers are covered with numerous long, radial needles, which facilitate floating in water. Globigerina, as distinguished from other rhizopods, is not benthonic but free swimming, and it is found in large numbers in plankton in warm seas. There are several tens of species, including many fossils. The shells of dead Globigerina fall to the bottom of the sea and form the principal constituent of deepwater oceanic globigerina ooze. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Howard's team collected shells of one foraminifera species, Globigerina bulloides, as they drifted toward the sea floor, and compared them to older specimens that had sunk several hundred years earlier. Also, the number of marine microorganisms in seafloor sediment--in particular, that of a species called Globigerina bulloides--indicates the upwelling of nutrient-rich waters, another measure of wind shear at the ocean's surface. The highest abundance of Globigerina bulloides, for instance, is generally found in the mid range of surface water temperatures, from about 10 to 25 [degrees] C, with highest abundances at about 17 [degrees] C. |
Globigerina |
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