Quinqueloculina

Quinqueloculina is a protistan genus, sometimes referred to the Rhizaria, included in the foraminiferal family Miliolidae.

As with all miliolids the test of Quinqueloculina is composed of imperphorate, porcelaneous calcite, often giving them a yellowish tint. As with the Miliolidae the chambers are arranged in various planes, with two chambers per whorl. In Quinqueloculins the chambers are in planes set 72 deg. apart, but successive chambers are in planes separared by 144 degrees. The name Quinqueloculina comes from the Latin for five. In Quinqueloculina five chambers are exposed to view on the outside, although the earlier three are sandwiched between the later two, one on one side, two on the other. Chambers are generally long and tubular, normally without integral floors, that function made by the underlying chamber.