Bolivina reticulata Hantken, 1875

Pl. 4, figs. 8a–b

Bolivina reticulata Hantken, 1875, p. 65, pl. 15, fig. 6; Fenero et al., 2012, p. 292, fig. 5.7; Valchev et al., 2013, p. 95, pl. 1, fig. 16.

Brizalina subreticulata Jones, 1994, p. 59, fig. 30–31.

Description: The test wall is calcareous and microperforate. The test is small, broad, biserial, triangular-ovoid in shape and elliptical in cross-section. The test is less than twice as long as it is wide. Irregular, reticulate, interwoven costae cover the entire test, giving a reticulate appearance to the test. The aperture is slit-like and situated at the base of the terminal chamber.

Life strategy: This species is infaunal (Drinia et al., 2007), unattached and prefers muddy sediments under dysoxic conditions (Kaiho, 1994). The bathymetric distribution of this species is recorded to be from the inner shelf to slope (Murray, 2006).

Remarks: The relative abundance is generally low, comprising trace components (<1%) in the samples of core 2670. The tests are small, measuring 0.2 mm in width and 0.35 mm in length.

Global stratigraphic range: This species occurs from the Oligocene to Recent (Fenero et al., 2012).

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