|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|M. Griffin and M. A. Hünicken 1994||Shell large, fairly elongated anteroposteriorly; spire conical; last whorl moderately convex, almost completely covering previous ones; shoulders rounded; shell very thick (up to 5 mm); suture strongly abutting; ornamentation consisting of very fine growth lines only; aperture ovoid-elongated; outer lip preserved as internal mold, showing a wide and shallow colabral sulcus which on internal surface of shell would be represented by dentiform ridge; lower half of sulcus deeper than upper and crossed by four narrow transverse crenulations; umbilicus absent; columella slightly concave towards aperture, cov- ered by fairly well developed callus|