Certain species of
Globigerinoides are more commonly used in various types of research than others. Commonly used species include
G. ruber,
G. sacculifer,
G. subquadratus, and
G. altiaperturus.
Globigerinoides sacculifer Globigerinoides sacculifer exhibits two different morphologies, known as
G. sacculifer with sac and
G. sacculifer without sac. The sac feature is a sac shaped terminal chamber that is formed prior to the production of the gametogenic calcite. When using
G. sacculifer tests for bulk isotope analysis tests without the sac morphology are often preferentially selected.
Globigerinoides ruber Globigerinoides ruber are carnivorous and prey upon copepods and nauplii. Once a copepod or nauplii is caught in its spines
G. ruber uses its pseudopodia to draw the caught prey close to its test to allow it to feed.
G. ruber has been found to tolerate hyposaline waters, in laboratory cultures it was able to remain alive in salinity ranges of 22-49%.
Globigerinoides subquadratus Among other microfossil evidence, the
last common occurrence of
G. subquadratus is defined as the beginning of the
Tortonian stage of the
geologic time scale. The boundary is defined at the
Monte dei Corvi Beach section in Italy.
Globigerinoides altiaperturus The
first appearance datum of
G. altiaperturus is the proposed base of the
Burdigalian stage of the
geologic time scale. The boundary has not yet been defined with a
GSSP by the
International Commission on Stratigraphy. == References ==