Holotype. Specimen MB.C.18679.1, illustrated by Korn et al. (2010) in Fig. 21.

Korn et al. (2010): "Differs from B. canalifer in the absence of the median groove and from B. singularis in the much narrower umbilicus (at 15 mm dm: uw/dm  0.43 in contrast to 0.57 in B. singularis) and the much higher aperture. A criterion to separate B. inflateralis from other species is the pouched lateral lobe, which is lanceolate in most the other species of the genus. B. africanus, for instance has a much less pouched lateral lobe; additionally it has a narrower umbilicate conch"