CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia imitata Subbotina 1953
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.
Original Description "Shell small, rotaliform, strongly convoluted with a broadly oval outline. Whorls 2 1/2-3. The first 2 whorls are considerably smaller than the last. Their diameter comprises on average only one third the diameter of the whole shell. Dorsal side flattened, ventral side convex, subconical. In the centre of the central side there is a very small, hardly discernible umbilicus. The umbilical ends of the chambers are disposed above the rest of the surface of the ventral side, thus forming the apex of a short cone. The peripheral margin is rounded and scalloped. The chambers on the dorsal side are oval and drawn out in the direction of the spiral whereas on the ventral side they are broadly triangular. There are 4 chambers to the last whorl and these show a rapid increase in dimensions. The sutures are recessed, almost straight or slightly curved, on both the dorsal and the ventral sides. Attention should be paid to the shortness of the sutures on the dorsal side as compared with the rather long sutures on the ventral side. The orifice is represented by a straight slit covered by well-defined slender lips. It has the form of an even rectangular cavity extending along the whole length of the marginal suture. The wall is thin, smooth, and in well-preserved specimens lustrous; it is perforated by many small pores. Dimensions: diameter 0.15-0.25 mm, thickness 0.08-0.11 mm."
References:
Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs
Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs
Globorotalia imitata compiled by the pforams@mikrotax project teamviewed: 11-4-2026
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Olsson_etal_99_pl10_f12-14.jpg
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