Dentalina albatrossi ( Cushman, 1923a ), , Jones, 1994

Bergh, Eugene W. & Compton, John S., 2022, Taxonomy of Middle Miocene foraminifera from the northern Namibian continental shelf, Zootaxa 5091 (1), pp. 1-55 : 8

Dentalina albatrossi ( Cushman, 1923a)

Pl. 1, fig. 10

Nodosaria vertebralis var. albatrossi, Cushman, 1923a , p. 47, pl. 15, fig. 1.

Dentalina albatrossi, Jones, 1994, p. 76 , pl. 64, figs. 11–12, 14; Hanagata & Nobuhara, 2014, p. 25, fig. 9.12–9.13.

Description: The wall is calcareous, hyaline. The test is elongate, slightly arcuate and uniserial, with the initial chamber possessing a short spine. Longitudinal continuous costae cover the test surface. The sutures are not depressed for most of the length of the test, except for the last few chambers towards the terminal end of the test. The chambers enlarge gradually toward the terminal end. The terminal chambers are also more oval in shape, compared to the initial portion of the test. The aperture is slightly protruding, terminal and radiate.

Remarks: Few tests of this species were found, comprising <1% of the total benthic foraminifera assemblage in core 2670. The tests are up to 3 mm long and thin, measuring 0.15 mm in cross-section.

Life strategy: This species is infaunal and adapted to suboxic to dysoxic conditions ( Kaiho, 1994, 1999).

Global stratigraphic range: Dentalina albatrossi is documented to occur from the Miocene to Recent ( Jones, 1994).

Regional occurrence: This study records D. albatrossi to occur in middle Miocene sediments on the Namibian outer continental shelf, south of the Kunene River mouth.