Bolli1957 pl22-13.JPG
Olig Atlas pl16-04 01-3.JPG
angustiumbilicata_holo.jpg
Bolli1957 pl22-12.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.
Bolli1957 pl22-13.JPG
Olig Atlas pl16-04 01-3.JPG
angustiumbilicata_holo.jpg
Bolli1957 pl22-12.JPGLinked specimens: USNM-5609 USNM-5610
Current identification/main database link: Tenuitella angustiumbilicata (Bolli, 1957)
Original Description
Shape of test very low trochospiral; equatorial periphery distinctly lobate, axial periphery rounded. Wall calcareous, perforate, surface smooth or very finely pitted. Chambers spherical; about 12, arranged in about 2½ whorls; the 4-5 chambers of the last whorl increase moderately to fairly rapidly in size. Sutures on spiral side depressed, radial; on umbilical side depressed, radial. Umbilicus small. Aperture a medium to low arch; interiomarginal, umbilical, often with a thin lip. Coiling random.
Size: Largest diameter of holotype 0.24 mm
Extra details from original publication
Remarks: Globigerina ciperoensis angustiumbilicata, new subspecies, is distinguished from G. ciperoensis ciperoensis by having a small umbilicus. The aperture, which is umbilical in position, may in some specimens show a tendency towards an umbilical—extraumbilical position.
Stratigraphic range (in Cipero formation): Globigerina ampliapertura zone to Catapsydrax dissimilis zone.
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 Pearson, P. N., Wade, B. S. & Huber, B. T. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerinitidae (Dipsidripella, Globigerinita, and Tenuitella). In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 16): 429-458. gsReferences:
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Globigerina ciperoensis angustiumbilicata compiled by the pforams@mikrotax project team viewed: 27-2-2020
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