Catalog - Sphaeroidinella missionis Catalog - Sphaeroidinella missionis

CATALOG OF ORIGINAL DESCRIPTIONS: Sphaeroidinella missionis Carter 1963

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> S -> Sphaeroidinella -> Sphaeroidinella missionis
Other pages this level: S. cellata, S. dehiscens excavata, S. dehiscens reticulata, S. dehiscens subdehiscens, S. disjuncta, S. ionica, S. ionica evoluta, S. ionica ionica, S. missionis, S. multiloba, S. rutschi, S. senni, S. spinulosa, S. transiens

Sphaeroidinella missionis

Citation: Sphaeroidinella missionis Carter 1963
Taxonomic rank: species
Type specimens: pl. 25, figs. 16-1 8, holotype,: ; no. 57770.
Type sample (& lithostrat): Portland Limestone; in a pale grey marl.
Type age (chronostrat): Upper Miocene,
Type locality: From Level I, a bed of pale grey marl at the base of a cliff section on the west side of Darlot Creek, Condah Mission, reference 756045 Heywood sheet, allotment 6a, Parish of Condah, Australia.
Type repository: Melbourne; Geological Museum of Victorian Geological Survey, Melbourne, Australia

Current identification:


Original Description

Definition. - A Sphaeroidinella of the apparently primitive type, with all chambers (about twelve) visible from the dorsal side but only four or five chambers visible from the ventral side. Chambers arranged in a very low trochospiral coil, without any marked envelopment of early chambers by later ones. Sutures are deeply depressed and flanked, in places, by rows of small granules of transparent shell material. Pores are small and closely spaced. Umbilicus relatively wide and deep. Several of the latter chambers open into the umbilicus by means of asymmetrical apertures of moderate size. Sutural apertures may occur on dorsal side.
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:
Dimensions: Greater diameter 0.44 mm.: lesser diameter 0.40 mm.: height 0.30 mm."

References:

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. gs


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

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