Classification Bandel (2006) recognized a family Bittiidae Cossmann, 1906 [which should then be named Diastomatidae Cossmann, 1894 on the grounds of priority] with five subfamilies Bittiinae Cossmann, 1906 (usually placed in Cerithiidae following Houbrick, 1993), Finellinae Thiele, 1931, Alabininae Dall, 1927, Dialinae Kay, 1979 and Diastomatinae Cossmann, 1894.
This contradicts Ponder (1994) who grouped Finella with Scaliola A. Adams, 1860 in a separate family Scaliolidae Jousseaume, 1912 [Scaliolidae is nevertheless kept distinct by Bandel (2006: 76) on the basis of having a shell agglutinating sand-grains]. It also contradicts Houbrick (1993) who holds the Bittiinae as a subfamily of the Cerithiidae.
It seems premature to reflect this scheme, which upsets current usage, in the WoRMS classification until shell characters are cross-checked wit at least another independent (e.g. molecular) set of characters. [details]