Siphonina pulchra Cushman, 1919

Bergh, Eugene W. & Compton, John S., 2022, Taxonomy of Middle Miocene foraminifera from the northern Namibian continental shelf, Zootaxa 5091 (1), pp. 1-55 : 25-26

publication ID	https://doi.org/10.11646/zootaxa.5091.1.1
publication LSID	lsid:zoobank.org:pub:ABC8AF70-F691-4D07-8F20-70934642C8BC
DOI	https://doi.org/10.5281/zenodo.5840545
persistent identifier	https://treatment.plazi.org/id/197787BA-FFCB-9337-7FC9-9D84FD1BFE02
treatment provided by	Plazi (2022-01-12 11:22:30, last updated 2024-11-26 00:50:08)
scientific name	Siphonina pulchra Cushman, 1919
status

Treatment

Siphonina pulchra Cushman, 1919 View in CoL

Pl. 5, figs. 4–6

Siphonina pulchra Cushman, 1919, p. 42 View in CoL , pl. 14, fig. 7a–c; Cushman, 1922a, p. 49, pl. 7, fig. 11–12; Cushman, 1927b, p. 8, pl. 2, fig. 5; Cushman, 1931, p. 69, pl. 14, fig. 2–3; Palmer, 1945, p. 61.

Description: The test wall is calcareous and perforate. The test is circular in outline, rounded, compressed and biconvex in side view. There are five chambers in the last whorl, gradually increasing toward the apertural end of the test. Sutures are coarsely perforate, distinct and oblique, radiating from the broad macroperforate centre of the test. The periphery of the test is unevenly carinate around the margin. The chambers are separated by flush oblique sutures. The elliptical-shaped aperture is produced on a broad tubular neck with a thick bordering lip.

Remarks: The relative abundances recorded for S. pulchra are trace (<1%) in all three cores. Several specimens were found to be partially broken or with the aperture missing. The diameter of the tests in Cushman (1931) was reported to be 0.65 mm. Tests in this study are slightly smaller, measuring 0.5 mm in diameter.

Life strategy: The genus Siphonina is epifaunal and prefers oxic bottom water conditions ( Kaiho, 1994), with a bathymetric distribution from shelf to slope depths ( Phleger & Parker, 1951).

Regional occurrence: This species is reported in middle Miocene sediments on the Namibian outer continental shelf, south of the Kunene River mouth (this study).

References

Cushman, J. A. (1919) Fossil foraminifera from the West Indies. In: Vaughan, T. W. (Ed.), Contributions to the Geology and Paleontology of the West Indies. Carnegie Institution of Washington, Washington, pp. 21 - 71.

Cushman, J. A. (1922 a) Shallow-water foraminifera of the Tortugas region. Carnegie Institution of Washington, Washington, 85 pp.

Cushman, J. A. (1927 b) Foraminifera of the genus Siphonina and related genera. Proceedings of the United States National Museum, 72, 1 - 15. https: // doi. org / 10.5479 / si. 00963801.72 - 2716.1

Cushman, J. A. (1931) The foraminifera of the Atlantic Ocean. Part 8. Rotaliidae, Amphisteginidae, Calcarinidae, Cymbaloporettidae, Globorotaliidae, Anomalinidae, Planorbulinidae, Rupertiidae, and Homotremidae. Bulletin of the United States National Museum, 104 (8), 1 - 179. https: // doi. org / 10.5479 / si. 03629236.104.7

Kaiho, K. (1994) Benthic foraminiferal dissolved-oxygen index and dissolved-oxygen levels in the modern ocean. Geology, 22 (8), 719 - 722. https: // doi. org / 10.1130 / 0091 - 7613 (1994) 022 <0719: BFDOIA> 2.3. CO; 2

Palmer, D. B. K. (1945) Notes on the foraminifera from Bowden, Jamaica. Bulletins of American Paleontology, 29, 1 - 82.

Phleger, F. B. & Parker, F. L. (1951) Ecology of foraminifera, northwest Gulf of Mexico. Part II. Foraminifera Species. Memoirs of the Geological Society of America, 46, 1 - 64. https: // doi. org / 10.1130 / MEM 46 - p 2 - 0001