Haynesina depressula (Walker and Jacob, 1798)

Figure 7.20

1798 Nautilus depressulus Walker and Jacob, p. 641, pl. 14, fig. 33.

2006 Nonion depressulum (Walker and Jacob); Oflaz, p. 227, pl. 9, figs. 5-6 (not pl. 7, figs. 4- 5).

2012 Haynesina depressula (Walker and Jacob); Debenay, p. 222.

2012 Nonion depressulum (Walker and Jacob); Milker and Schmiedl, p. 112, fig. 25.17-18.

Description. Test circular, biumbilicate, wall calcareous, finely perforate, surface smooth; chambers slightly inflated, planispirally arranged, gradually increasing in size, coiling involute; umbilici narrow and depressed with pustules; periphery subrounded, slightly lobulate, sutures radial, curved backwards, cut near umbilicus; aperture interiomarginal, a low arched opening.