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.

Cystiscinae
Drawing of a typical animal in this subfamily
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Cystiscidae
Subfamily:	Cystiscinae Stimpson, 1865

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:^[1]

• Crithe Gould, 1860
• Cystiscus Stimpson, 1865:55
• Extra Jousseaume, 1894 - with the only species Extra extra Jousseaume, 1894^[2]
• Gibberula Swainson, 1840
• Inbiocystiscus Ortea and Espinosa, 2001^[3]
• Intelcystiscus Ortea and Espinosa, 2001^[3]
• †Marginocystiscus Landau, C. M. Silva & Heitz, 2016^[4]
• Pachybathron Gaskoin, 1853
• Persicula Schumacher, 1817
• Ticocystiscus Espinosa and Ortea, 2002
• Ticofurcilla Espinosa & Ortea, 2002
• †Topaginella Laseron, 1957:288

Comparative shell structure of three genera

• 
  Cystiscus
• 
  Crithe
• 
  Extra