Olsson_etal_99_pl10_f04-6.jpg
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.
Olsson_etal_99_pl10_f04-6.jpgCurrent identification/main database link: Praemurica inconstans (Subbotina 1953)
Original Description
"Test with round or broadly oval outline consisting of 2-2 1/2 whorls to the spiral. Peripheral margin rounded, weakly lobulate. The early whorls are disproportionately small relative to the last whorl. They (the whorls) are situated either on the same plane as the last whorl or even below it. The last whorl contains 5-6 chambers which increase gradually in size; the last chamber is often considerably larger than the others. However, there are some individuals in which the last three chambers are of equal size.
Dorsal side very strongly compressed, ventral side convex, in certain forms conical. There is a well-defined, shallow umbilicus in the middle of the ventral side. Chambers spherical, closely packed together. The outline of the dorsal side of the chambers is rounded and that of the ventral side is either rounded or triangular.
Sutures simple, curved in the form of an arc. On the ventral side they radiate from the umbilicus. Aperture slit-like, situated along the marginal suture. Walls smooth, often finely cancellate. Dimensions: diameter 0.35-0.45 mm, thickness 0.12-0.20 mm."
Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gsReferences:
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Globigerina inconstans compiled by the pforams@mikrotax project team viewed: 18-4-2021
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