2018 Becker in Hartenfels & Becker, p. 622, text-fig. 14g-j, 23

Holotype - GMM B6.C.42-3, loose from Gonioclymenia Limestone at Jebel Ouaoufilal, B. costatus Subzone

There are nine

low ribs on the quarter of a whorl, which are not

as wide as the interspaces.