Nonion fabum (Fichtel and Moll, 1798)

Figure 6.20

1798 Nautilus faba Fichtel and Moll, p. 103, pl. 19, figs. a-c.

2010 Nonion fabum (Fichtel and Moll); Margreth, p. 123, pl. 36, fig. 2a-c.

2012 Nonion fabum (Fichtel and Moll); Milker and Schmiedl, p. 112, fig. 25.22-24.

2014 Nonion fabum (Fichtel and Moll); Panchang and Nigam, pl. 33, fig. 11a-b.

Description. Test ovate, compressed, wall calcareous, perforate, surface smooth, umbilici slightly depressed, ornamented with pustules; chambers many, inflated, planispirally arranged with rapid increase in size, coiling involute; periphery broadly rounded, sutures thick and curved backwards; aperture an interiomarginal slit-like opening.