Cystiscinae

Cystiscinae are a taxonomic subfamily of minute sea snails. These are marine gastropod mollusks or micromollusks in the family Cystiscidae, and the clade Neogastropoda.

Diagnosis
Shell minute to small, white; spire immersed to low; surface smooth or axially costate; lip thickened, smooth or denticulate; external varix absent; siphonal notch absent; posterior notch absent; columella multiplicate, with combined total of usually 2 to 8 plications plus parietal lirae; internal whorls cystiscid type. Animal mantle smooth, at least partially extending over external shell surface. Internal anatomy unknown.

Genera
Genera within the subfamily Cystiscinae are as follows:
 * Crithe Gould, 1860
 * Cystiscus Stimpson, 1865:55
 * Extra Jousseaume, 1894 - with the only species Extra extra Jousseaume, 1894
 * Gibberula Swainson, 1840
 * Inbiocystiscus Ortea and Espinosa, 2001
 * Intelcystiscus Ortea and Espinosa, 2001
 * †Marginocystiscus Landau, C. M. Silva & Heitz, 2016
 * Pachybathron Gaskoin, 1853
 * Persicula Schumacher, 1817
 * Ticocystiscus Espinosa and Ortea, 2002
 * Ticofurcilla Espinosa & Ortea, 2002
 * †Topaginella Laseron, 1957:288