Praeorbulina curva

• Main Authors: Bergh, Eugene W., Compton, John S.
• Format: Text
• Language: unknown
• Published: Zenodo 2022
• Subjects: Biodiversity; Taxonomy; Chromista; Foraminifera; Globothalamea; Rotaliida; Globigerinidae; Praeorbulina; Praeorbulina curva; Curva; Kennett; Saunders; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.5281/zenodo.5840609; https://zenodo.org/record/5840609

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). : Published as part of Bergh, Eugene W. & Compton, John S., 2022, Taxonomy of Middle Miocene foraminifera from the northern Namibian continental shelf, pp. 1-55 in Zootaxa 5091 (1) on page 36, DOI: 10.11646/zootaxa.5091.1.1, http://zenodo.org/record/5840434 : {"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"]}