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Globigerinidae, in which the adult test is clearly trochoid, and possesses a distinct primary interiomarginal umbilical aperture throughout life. Wall structure complex, consisting, at least in part, or more than one layer or shell material: primary wall covered by a secondary cortex, superficially smooth and shiny. in which the perforations ofthe primary wall may be much reduced or absent. Lips thickened to become flange-like. often crenulatc, but still fundamentally symmetrical [L. Miocene to Recent].
Sphaeroidinellinae compiled by the pforams@mikrotax project team viewed: 17-9-2021
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