Taxonomy of Middle Miocene foraminifera from the northern Namibian continental shelf
Author
Bergh, Eugene W.
0000-0002-0765-4141
Marine Research Institute and Department of Geological Sciences, University of Cape Town, Private Bag X 3, Rondebosch, 7701, South Africa. & Department of Environmental and Geographical Sciences, University of Cape Town, Private Bag X 3, Rondebosch, 7701, South Africa; & Invertebrate palaeontology and Geology, Iziko South African Museum, P. O. Box 61, Cape Town 8000, South Africa. john. compton @ uct. ac. za; https: // orcid. org / 0000 - 0002 - 0765 - 4141
john.compton@uct.ac.za
Author
Compton, John S.
Marine Research Institute and Department of Geological Sciences, University of Cape Town, Private Bag X 3, Rondebosch, 7701, South Africa.
text
Zootaxa
2022
2022-01-12
5091
1
1
55
journal article
2636
10.11646/zootaxa.5091.1.1
51b42715-ddb1-4b4a-aad4-8be0f600a287
1175-5326
5840434
ABC8AF70-F691-4D07-8F20-70934642C8BC
Laevidentalina
sp. B
Pl. 1, fig. 14
Description
: The test wall is calcareous. The test is elongate, slender, uniserial, arcuate and circular in cross-section. The initial end is pointed. The chambers are separated by flush sutures and gradually increase in size toward the apertural end. The surface of the test is smooth. The aperture is terminal and arcuate in shape on a short neck.
Remarks:
Few tests of this species were recorded, accounting for a trace component (<1%) of the assemblage in core 2670. The tests are relatively large, measuring
0.1 mm
in cross section and up to
1 mm
in length.
Life strategy:
The genus
Laevidentalina
has been reported as being infaunal (
Alegret
et al
., 2003
) under high (
Cimerman & Langer, 1991
; Sgarella & Moncharmont Zei, 1993;
Milker & Schmiedl, 2012
) and suboxic to dysoxic conditions (
Rögl & Spezzaferri, 2002
).
Global stratigraphic range:
The stratigraphic range for the genus
Laevidentalina
is Cretaceous to Recent (
Loeblich & Tappan, 1988
).
Regional occurrence:
This species is recorded to occur in middle Miocene sediments on the Namibian outer continental shelf, south of the
Kunene
River
mouth (this study).