Lenticulina orbicularis (d’Orbigny, 1826)

Figure 2.6-7

1826 Robulina orbicularis d’Orbigny, p. 288, pl. 15, figs. 8-9.

2010 Lenticulina orbicularis (d’Orbigny); Margreth, p. 150, pl. 12, fig. 8a-b.

2012 Lenticulina orbicularis (d’Orbigny); Debenay, p. 224.

2012 Lenticulina orbicularis (d’Orbigny); Milker and Schmiedl, p. 73, figs. 18.19-20.

Description. Test rounded, strongly biconvex, peripheral view lenticular, wall finely perforate, surface smooth, umbo prominent; chambers many, narrow; periphery with a thick keel, sutures strongly curved; aperture terminal, radiate, with a slit on the apertural side.