Globorotalia menardii (d’Orbigny, 1826)

Figure 14.15-16

1826 Rotalia menardii d’Orbigny, p. 273.

2010 Globorotalia menardii (Parker, Jones and Brady, 1865); Ovechkina, Bylinskaya and Uken, p. 234, fig. 3B, 3E.

Description. Test biconvex, wall calcareous, perforate, surface smooth, no spines; chambers nearly flat, semi-circular on the spiral side, slightly inflated, subtriangular on the umbilical side, rapidly increasing in size as added, chamber arrangement trochospiral; periphery keeled, sutures curved on the spiral side, radial on the umbilical side; aperture low arch, interiomarginal, umbilical, with a plate-like tooth.