Sigmoilopsis schlumbergeri (Silvestri, 1904)

Figure 21.2

1904 Sigmoilina schlumbergeri Silvestri, p. 267, pl. 7, figs. 12-14; p. 481, text-fig. 6; p. 482, text-fig. 7.

2010 Sigmoilopsis schlumbergeri (Silvestri); Margreth, p. 104, pl. 11, fig. 5a-c.

2012 Sigmoilopsis schlumbergeri (Silvestri); Milker and Schmiedl, p. 69, fig. 18.7-8.

2014 Sigmoilopsis schlumbergeri (Silvestri); Panchang and Nigam, pl. 14, figs. 12a-c, 13a-c.

Description. Test oval, wall porcelaneous, outer layer composed of agglutinated material, surface rough; chambers obscured, chamber arrangement sigmoidal initially, later planispirally arranged; periphery broadly rounded, sutures indistinct; aperture terminal, circular on a non-agglutinated, short neck, bordered by a weak rim, with a short tooth.