Family Chelonibiidae Pilsbry, 1916

(nom. transl. Newman 1996 [ex Chelonibiinae Pilsbry, 1916: 262])

Type genus. Chelonibia Leach, 1817:68 by original designation of Pilsbry (1916: 262).

Diagnosis. Wall either eight-plated (R-RL-CL1-CL2-C) or six-plated (R-CL1-CL2-C), bi- to multilamellar with longitudinal tubes internal, opercular plates normal, always present; apertural (formerly “opercular” or “oral”) hood absent.