Genus – Bolivina
Genus Bolivina d’Orbigny, 1839
Description from Loeblich and Tappan (1964): test elongate may be somewhat compressed; chambers broad, low biserially arranged throughout; basal margin of the chambers with retral process or backward directed chamber overlaps; walls calcareous, perforate, radial in structure, smooth striate or costate and may have marginal keel; aperture narrow, elongate loop up chamber face, one margin ending blindly or bent upwards as color, opposite border attached to one side of double folded internal tooth plate (U-shaped in section).
Bolivina pacifica Cushman & McCulloch, 1942
Bolivina pacifica Cushman & McCulloch, Crouch, 1952, p. 830, pl. 3, fig. 4; Bandy, 1953, p. 28, pl. 24, fig. 8; Uchio, 1960, pl. 7, fig. 1.
Bolvina acerosa Cushman var. pacifica Cushman & McCulloch, 1942, p. 185, pl. 21, figs. 2, 3.
Brizalina pacifica (Cushman and McCulloch) Lankford and Phleger, 1973, p. 115, pl. 4, fig. 7.
Description of Bolivina acerosa Cusham 1936: Test very elongate, slender 4 or 5 times as long as broad, somewhat compressed, periphery rounded, very gradually taping from the acute initial end with the greatest breadth formed by the last pair of chamber, last part of the test often with early parallel sides; chambers distinct, not inflated, increasing very gradually and regularly in size, increasing somewhat in relative height towards apertural end; sutures distinct, not depressed, nearly straight, forming and angle of nearly 45o with the horizontal; wall finely perforate, early portion with a series of fine longitudinal costae, latter half smooth; aperture narrow, elongate. Length 0.35 – 0.45 mm, breath 0.08-0.22 mm, thickness 0.05 – 0.07 mm.
Cushman and McCulloch (1942) named B. acerosa var. pacfica from Recent specimens collected in the Gulf of California, Mexico. They described the variety as differing from the typical forms in the larger size, lack of ornamentation in the early portion, and distinct clear areas in the upper and inner portions of each chamber.
Remarks: Bernhard et al (2010) reported B. pacific from oxygen-depleted bottom waters of the Santa Barbara Basin, California, that harbored microbial ectobionts.
Distribution: Puget Sound, B. pacifica is rare and is found in Boundary Bay and Sinclair Inlet.
