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Current identification:
Original Description
Description. - A small, free test composed of about twelve globular chambers arranged in about three whorls; trochospiral with a very low spire, appearing almost planispiral in peripheral view. Chambers increase in size slowly at first, later rapidly, but the last chamber may be much smaller than its predecessor and may protrude conspicuously beyond the general outline of the test. Sutures are unthickened, incised and depressed. Sutural flanges absent. Wall of test is thin, translucent, smooth but not polished; pores are small and closely placed. Umbilicus having a diameter of about one fifth of the diameter of the test; fairly deep, receiving openings of the last three or four chambers. Aperture is a low, asymmetrical opening of moderate size at the base of the umbilical face of the last chamber. Two or three sutural apertures opening on dorsal side along base of last chamber.
Size:
Carter, A. N. (1963). Appendix no. 3, foraminifera from the Portland Limestone. In, Boutakoff, N. (ed.) The geology and geomorphology of the Portland area. Memoirs of the Geological Survey of Victoria . 22: 156-160. gsReferences:

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Sphaeroidinella missionis compiled by the pforams@mikrotax project team viewed: 11-5-2026
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