Praeorbulina curva
Creators
- 1. 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
- 2. Marine Research Institute and Department of Geological Sciences, University of Cape Town, Private Bag X 3, Rondebosch, 7701, South Africa.
Description
Praeorbulina curva (Blow, 1956) Pl. 8, fig. 8
Globigerinoides glomerosa curva Blow, 1956, p. 64, text-fig. 1, 9–14.
Praeorbulina glomerosa curva Bolli et al., 1985, p. 199, figs. 23.5, 24.6; Kennett & Srinivasan, 1985, p. 82, pl. 18, figs. 3-4.
Description: The test surface is cancellate-spinose. The test is trochospiral, globular and semi-circular or subspheroidal in cross section. The final chamber envelops earlier chambers. The proportion of the enveloping chamber is variable, with 40 to 70% of the test that can be covered. Apertures form slits along the margins of the ultimate, penultimate and earlier chambers. Numerous narrow slit-like apertures can cover the test along the sutures. The sutures become more incised in the later chambers.
Remarks: This species occurs in minor abundances in the cores. The tests are moderate in size, measuring up to 0.4 mm in diameter.
Environmental preferences: Praeorbulina curva is considered to be a temperate to warm water tropical species (Kennett & Srinivasan, 1983).
Global stratigraphic range: This species has been recorded to occur from the early (Burdigalian) to middle Miocene – Langhian (Kennett & Srinivasan, 1983; Wade et al., 2011).
Regional occurrence: Praeorbulina curva is documented to occur in middle Miocene-aged sediments of the northern Namibian continental shelf, south of the Kunene River mouth (this study).
Notes
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Globigerinidae
- Genus
- Praeorbulina
- Kingdom
- Chromista
- Order
- Rotaliida
- Phylum
- Foraminifera
- Scientific name authorship
- Blow
- Species
- curva
- Taxon rank
- species
- Taxonomic concept label
- Praeorbulina curva (Blow, 1956) sec. Bergh & Compton, 2022
References
- Blow, W. H. (1956) Origin and evolution of the foraminiferal genus Orbulina d'Orbigny. Micropaleontology, 2 (1), 57 - 70. https: // doi. org / 10.2307 / 1484492
- Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (1985) Plankton Stratigraphy. Cambridge University Press, Cambridge, 1032 pp.
- Kennett, J. P. & Srinivasan, M. S. (1983) Neogene Planktonic Foraminifera. A Phylogenetic Atlas. Hutchinson Ross, Stroudsburg, 265 pp.
- Wade, B. S., Pearson, P. N., Berggren, W. A. & Palike, H. (2011) Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews, 104, 111 - 142. https: // doi. org / 10.1016 / j. earscirev. 2010.09.003