Calcarina spengleri (Gmelin, 1791)

Figure 6.1-2

1788 Nautilus spengleri Gmelin, p. 3371.

2005 Calcarina spengleri (Gmelin); Renema and Hohenegger, p. 16, pl. 1, figs. 1-10; text-fig. 1.

2014 Calcarina spengleri (Gmelin); Panchang and Nigam, pl. 37, figs. 9a-b, 10a-b.

Description. Test large, biconvex, side view lenticular, wall calcareous, coarsely perforate, surface ornamented with few, granulated calcitic knobs in the centre; chambers many, final chambers long, narrow and inflated, chamber arrangement trochospiral; periphery with long, tapering, blunt spines; sutures distinct only in the final chambers, slightly depressed on the spiral side, radial and depressed on the umbilical side; aperture not seen.