«  Shell minute to small, white, hyaline; surface smooth or sculptured; spire flat to immersed; lip thickened, smooth or denticulate; external varix present; siphonal notch absent; columella with 2 internally reduced columellar plications, plus 1 or 2 pseudo-continuous plications; internal whorls modified cystiscid type. » – Coovert & Coovert: “Revision of the supraspecific classification of marginelliform gastropods”, The Nautilus vol.109(2-3), Melbourne (Fla) 1995, p.73.
 

« Shell minute to small, white, hyaline; spire immersed; lip strongly thickened, usually denticulate; external varix present; siphonal notch absent; collabral parietal callus ridge often present; columella with 4 strong plications that are often excavated inside aperture. » – Coovert & Coovert: op. cit. p.73.