Operculina discoidalis d’Orbigny, 1826

Figure 12.11

1826 Nummulina (Assilina) discoidalis d’Orbigny, p. 296, no. 88.

2011 Operculina discoidalis (d’Orbigny); Hohenegger, p. 659, fig. 2a.

2012 Operculina discoidalis (d’Orbigny); Debenay, p. 228.

Description. Test very flat, discoidal, wall calcareous, finely perforate, surface distinctly ornamented with granular pustules; chambers not separate; coiling involute initially, later nearly evolute; periphery rounded with a distinct keel, sutures slightly raised, limbate, marked with rows of pustules, slightly depressed at the periphery.