Marginulinopsis costata (Batsch, 1791)

Figure 2.10

1791 Nautilus (Orthoceras) costatus Batsch, p. 2, pl. 1, fig. 1.

2012 Marginulina costata (Batsch); Milker and Schmiedl, p. 73, fig. 18.26.

Description. Test elongate, cross section subcylindrical or oval, wall calcareous, surface ornamented with long striae; earlier chambers compact, final chambers inflated and subspherical, closely coiled initially, later uniserially arranged; sutures indistinct in the earlier chambers, straight and depressed in the final chambers; aperture terminal at the end of a short neck.