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 Globocassidulina subglobosa ( Brady, 1881 ) Pl. 4, figs. 9–10 Cassidulina subglobosa Brady, 1881 , p. 60 ; Brady, 1884 , p. 430 , pl. 54, fig. 17; Barker, 1960 , pl. 54, fig. 17. Globocassidulina subglobosa LeRoy & Levinson, 1974 , p. 14 , pl. 7, fig. 8; Tjalsma & Lohmann, 1983 , p. 31 , pl. 16, fig. 9; Lowry, 1987 , p. 239 , pl. 14, figs. 7a–c; Miller & Katz, 1987 , p. 134 , pl. 3, fig. 4; Hermelin, 1989 , p. 74 ; Thomas, 1990 , p. 590 ; Jones, 1994 , p. 60 , pl. 54, fig. 17; Robertson, 1998 , p. 136 , pl. 53, figs. 1–2; Kuhnt et al ., 2002 , p. 144 , pl. 10, figs. 3–5; pl. 17, figs. 1–2; Kender et al ., 2008 , p. 512 , pl. 17, fig. 1–2; Milker & Schmiedl, 2012 , p. 85 , figs. 20.13–20.14; Holbourn et al ., 2013 , p. 264 . Description : The test wall is calcareous and smooth. The test is small, subglobular and subcircular in cross-section. The chambers have a biserial arrangement, are inflated and globular in shape, separated by depressed sutures. The aperture is slit-like, situated interio-marginal and stretches along the margin of the terminal chamber. Remarks: Specimens from this species comprise a trace component (<1%) in core 2658, a minor component (<5%) in core 2682 and major component (<40%) in core 2670. The tests from this study are smaller than those in LeRoy & Levinson (1974) (diameter of up to 0.75 mm ), measuring 0.25 mm in diameter. Life strategy: This species is epifaunal to shallow-infaunal ( Kaiho, 1994 ; Vilela, 1995 ), generally unattached and prefers muddy sediments under oxic ( Kaiho, 1994 ) to suboxic ( De & Gupta, 2010 ) conditions. Schmiedl et al . (1997) recorded G. subglobosa in oligotrophic areas, under vigorous bottom currents and sandy substrates. Panieri & Gupta (2008) recorded this species in relatively high abundances in muddy substrates. The bathymetric range of G. subglobosa is broad, stretching from the middle shelf to abyssal depths ( Murgese & de Deckker, 2005 ; Holbourn et al ., 2013 ). Global stratigraphic range: Globocassidulina subglobosa occurs from the Palaeocene to Recent ( Holbourn et al ., 2013 ). Regional occurrence : This species is recorded in Miocene-aged strata from the Congo Basin ( Kender et al. , 2008 ) and the Namibian outer continental shelf, south of the Kunene River mouth (this study). Hay et al. (1984) and Wefer et al . (1998) reported the occurrence of Globocassidulina subglobosa in late Miocene to Pleistoceneaged sediments along the continental slope in relatively minor abundances (<10%) at most sites. Lowry (1987) recorded occurrences of G. subglobosa in surface sediments on the continental shelf, between Cape Town and Port Elizabeth.