Clavulinoides trilatera (Cushman, 1926)

Bergh, Eugene W. & Compton, John S., 2022, Taxonomy of Middle Miocene foraminifera from the northern Namibian continental shelf, Zootaxa 5091 (1), pp. 1-55 : 7

Clavulinoides trilatera (Cushman, 1926)

Pl. 1, figs. 5–7

Clavulina trilatera Cushman, 1926, p. 588 , pl. 17, fig. 2.

Clavulina trilatera var. aspera Cushman, 1926, p. 589 , pl. 17, fig. 3; Cushman, 1946, p. 38, pl. 9, figs. 10–16.

Clavulinoides trilatera Mello, 1969, p. 50 , pl. 1, fig. 3a–b.

Description: The test wall is agglutinated and well cemented. The test is triangular in section, tapering towards the initial end and broadening towards the apertural end. The early stage is triserial, becoming uniserial and angular as chambers are added. The chambers enlarge as added, with flush sutures. The aperture is rounded, dentate and terminal.

Life strategy: This species is infaunal ( Ali, 2015) at slope to abyssal depths ( Alegret et al., 2002; Holbourn et al., 2013).

Remarks: Specimens from this species are large, measuring up to 0.5x 2 mm. Few specimens have been found in core 2670, forming a minor component (<5%) of the total foraminifera composition.

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