Amphistegina lessonii d’Orbigny, 1826

Figure 7.5

1826 Amphistegina lessonii d’Orbigny, p. 304, pl. 17, figs. 1-4.

2002 Amphistegina lessonii d’Orbigny; Yordanova and Hohenegger, p. 178, pl. 31, figs. 4-8.

2003 Amphistegina lessonii d’Orbigny; Javaux and Scott, p. 11, fig. 2.4-6.

2007 Amphistegina lessonii d’Orbigny; Yordanova and Hohenegger, p. 1276, fig. 1.10.

2012 A mphistegina lessonii d’Orbigny; Debenay, p. 215.

2014 Amphistegina lessonii d’Orbigny; Hohenegger, p. 723, fig. 17.

2014 Amphistegina lessonii d’Orbigny; Panchang and Nigam, pl. 32, fig. 1a-c.

Description. Test lenticular, outline circular, more convex on the spiral side, wall calcareous, umbilicus transparent, imperforate, surface smooth, apertural face with pustules; chambers many, curved backwards at the periphery, chamber arrangement low trochospiral, coiling involute; periphery rounded, margin subacute, sutures slightly depressed; aperture interiomarginal, umbilical, a slit-like opening, surrounded by pustules, bordered by a narrow lip.