title: Truncatellidae
text: # Truncatellidae
  
  Truncatellidae, common name the "looping snails", is a family of small amphibious snails, with gills and an operculum, semi-marine gastropod mollusks or micromollusks.
  
  ## Shell description
  
  This family of snails have small shells which lose their apical whorls as they continue to grow, giving the shells a truncated and cylindrical appearance.
  
  ## Subfamilies
  
  The family Truncatellidae consists of two subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005):
  
  * subfamily Truncatellinae Gray, 1840
  * subfamily Geomelaniinae Kobelt & Möllendorff, 1897
  
  ## Genera
  
  Genera within the family Truncatellidae include:
  
  Truncatellinae
  
  * Truncatella Risso, 1826 - type genus of the family Truncatellidae
  
  Geomelaniinae
  
  * Geomelania L. Pfeiffer, 1845 - type genus of the subfamily Geomelaniinae
  
  subfamily ?
  
  * †Nystia
  * Taheitia Adams, 1863
  
  ## Habitat
  
  Snails in this family are found in marine coastal environments, near or just above the high tide line on stones and pebbles, fine sediments and decomposing vegetation.
  
  ## Life cycle
  
  The sexes are separate. Fertilized eggs are laid as egg capsules, which are attached to detritus.
  
  