“COSTAE” на російській мові

The main part of the shell is coarsely commarginally lamellose and lacks radial costae .

The internal molds are smooth with exception of traces of the concentric costae on the rostral face.

He differentiated his new species from S. robusta by its more numerous costae on the shell flanks.

It has strong divaricate ornamentation of coarse costae and/or small plicae, which bear low, close nodes, but which cover both the anterior and posterior faces of the shell.

Wall thickness is 10-26 m, becoming thicker at the corners of the chamber where it may bulge outwardly to produce coarse longitudinal costae .