CATALOG OF ORIGINAL DESCRIPTIONS: Globorotaloides Bolli 1957
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 Test free, trochospiral, chambers ovate to spherical, sutures depressed, surface smooth or pitted; primary aperture in the early stage interiomarginal, umbihcalextraumbilical, later becoming umbilical. Ultimate chamber often smaller than penultimate, may cover part or entire umibilicus and become almost indistinguishable from a bulla. This ultimate chamber normally has a single aperture though multiple ones may occur. Extra details from original publication Remarks: Globorotaloides, new genus, shows in stages the characteristic feature of three planktonic genera. The first stage is that of a Globorotalia with a distinct interiomarginal, umbilical-extraumbilical primary aperture, followed by a Globigerina-like stage, where the aperture becomes umbilical. The presence of a bullalike final chamber covering a part or the whole umbilicus indicates the final Catapsydrax-like stage. Specimens featuring the early Globorotalia stage only (pl. 27, figs. 15b, 17b) or the following Globigerina-like stage (pl. 27, fig. 19b) were found commonly in the samples studied. The close relationship of these stages with the fully developed Globorotaloides becomes evident when studying a large number of specimens. The mature stage does not depend on the size of the specimen; it may be found in small and large forms. In small specimens with a bulla-like final chamber (pl. 27, fig. 16b) the Globigerina stage may be missing. Globorotaloides, new genus, differs from Globorotalia in the interiomarginal umbilical position of the primary aperture in the final chamber and in the possession of a bulla-like small chamber that covers part or all of the umbilicus.
References:
Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 97-123. gs
Globorotaloides compiled by the pforams@mikrotax project teamviewed: 10-12-2024
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