Close to the Planaxidae. The shells are« conical, spirally sculptured, lacking distinct axial sculpture; aperture ovate, without anterior canal and apertural varix; protoconch smooth or with median spiral ridge. Operculum paucispiral, simple, with eccentric nucleus. » – Ponder & de Keyzer: “A revision of the genus Diala (Gastropoda; Cerithioidea; Dialidae)”, Invertebrate Taxonomy vol.6, 1992, p.1021.
 

« Shell imperforate, oval-conical, often semi-opaque, variously patterned, with whorls simple. Aperture oval, anteriorly complete; labrum almost straight; lip simple. » – A. Adams: «On some new genera and species of Mollusca from the North of China and Japan», Annals and Magazine of Natural History ser.3 vol.8, London 1861, p.242.