Obtortionidae is a family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of sea snail

Sea snail

Sea snail is a common name for those snails that normally live in saltwater, marine gastropod molluscs....

s, marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 gastropod molluscs in the superfamily Cerithioidea

Cerithioidea

The Cerithioidea is a superfamily of marine, brackish water and freshwater gastropod containing more than 200 genera. The Cerithoidea are included in the clade Sorbeoconcha. The original name of this superfamily was Cerithiacea, in keeping with common superfamily endings at the time.- Ecology...

, that is within the clade Cerithimorpha or in clade Sorbeoconcha

Sorbeoconcha

Sorbeoconcha is a taxonomic clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda.The taxon Sorbeoconcha was named by Winston Ponder and David R. Lindberg in 1997.-1997 taxonomy:...

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The shell of the larva is ornamental.

2005 taxonomy

According to the taxonomy of the Gastropoda by Bouchet & Rocroi (2005)

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

 the family Obtortionidae has been recognized as a synonym of family Scaliolidae

Scaliolidae

Scaliolidae, common name scaliolids, is a family of sea snails, marine gastropod molluscs in the clade Sorbeoconcha.The sand agglutinates to the teleoconch in Scaliola.- 2005 taxonomy :...

 within clade Caenogastropoda

Caenogastropoda

Caenogastropoda is a taxonomic clade of a large diverse group of mostly marine gastropods.Caenogastropoda contains a majority of the families of shelled marine molluscs including such families as the periwinkles, cowries, wentletraps, moon snails, and cone snails.About 60% of all living gastropods...

/clade Sorbeoconcha

Sorbeoconcha

Sorbeoconcha is a taxonomic clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda.The taxon Sorbeoconcha was named by Winston Ponder and David R. Lindberg in 1997.-1997 taxonomy:...

/Superfamily Cerithioidea

Cerithioidea

The Cerithioidea is a superfamily of marine, brackish water and freshwater gastropod containing more than 200 genera. The Cerithoidea are included in the clade Sorbeoconcha. The original name of this superfamily was Cerithiacea, in keeping with common superfamily endings at the time.- Ecology...

. Finellidae has been also a synonym of Scaliolidae.

2006 taxonomy

Bandel (2006) have classified Obtortionidae in superfamily Cerithioidea

Cerithioidea

The Cerithioidea is a superfamily of marine, brackish water and freshwater gastropod containing more than 200 genera. The Cerithoidea are included in the clade Sorbeoconcha. The original name of this superfamily was Cerithiacea, in keeping with common superfamily endings at the time.- Ecology...

 within clade Cerithimorpha in the order Palaeo-Caenogastropoda Bandel, 1993 within subclass Caenogastropoda

Caenogastropoda

Caenogastropoda is a taxonomic clade of a large diverse group of mostly marine gastropods.Caenogastropoda contains a majority of the families of shelled marine molluscs including such families as the periwinkles, cowries, wentletraps, moon snails, and cone snails.About 60% of all living gastropods...

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Genera

Genera within the family Obtortionidae include:

• Obtortio Hedley, 1899
• Clathrofenella Kuroda & Habe, 1952
• Finella
  Finella
  Finella is a genus of sea snails, marine gastropod mollusks in the family Scaliolidae.This genus has been assigned in the course of time to different families by different authors: Rissoidae, Cerithiidae, Dialidae, Obtortionidae, Finellidae and Diastomatidae Morphological and anatomical studies by...
  
  Adams, 1860 is in subfamily Finellinae within Bittiidae per Bandel (2006) but it used to be classified in Obtortionidae also (WoRMS 2009).