Cycloneritimorpha
Encyclopedia
Cycloneritimorpha is a clade
of land snail
s, freshwater snails, and sea snails. These are gastropod molluscs within the larger clade Neritimorpha
. 14 of the families in the clade are still extant, and 8 of the families are extinct.
According to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)
, as well as the Cycloneritimorpha, the clade Neritimorpha also contains the (entirely fossil) clade Cyrtoneritimorpha
, plus a number of other fossil families that are currently unassigned.
The earliest evolutionary forms of Cycloneritimorpha show double visceral organs, double gills, and normally a double-chambered heart.
.
Clade Cycloneritimorpha contains:
Clade
A clade is a group consisting of a species and all its descendants. In the terms of biological systematics, a clade is a single "branch" on the "tree of life". The idea that such a "natural group" of organisms should be grouped together and given a taxonomic name is central to biological...
of land snail
Snail
Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...
s, freshwater snails, and sea snails. These are gastropod molluscs within the larger clade Neritimorpha
Neritimorpha
Neritimorpha is a taxonomic grouping, an unranked clade of snails, gastropod mollusks. This grouping includes land snails, sea snails, some deepwater limpets, and also freshwater snails...
. 14 of the families in the clade are still extant, and 8 of the families are extinct.
According to the Taxonomy of the Gastropoda (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...
, as well as the Cycloneritimorpha, the clade Neritimorpha also contains the (entirely fossil) clade Cyrtoneritimorpha
Cyrtoneritimorpha
Cyrtoneritimorpha is a clade of fossil sea snails, marine gastropod mollusks within the clade Neritimorpha.This order contains two extinct families: Orthonychiidae and Vltaviellidae....
, plus a number of other fossil families that are currently unassigned.
The earliest evolutionary forms of Cycloneritimorpha show double visceral organs, double gills, and normally a double-chambered heart.
Taxonomy
The taxonomy of Cycloneritimorpha is based on work by Kano et al. (2002), that recognizes 4 clades. These clades are established on genetic analysis (28S rRNA) of recent species only. These clades proposed by Kano are ranked as superfamilies in taxonomy of the Gastropoda (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...
.
Clade Cycloneritimorpha contains:
- Superfamily HelicinoideaHelicinoideaHelicinoidea is a taxonomic superfamily of land snails that have an operculum. In other words, they are terrestrial operculate gastropod mollusks...
- Family HelicinidaeHelicinidaeHelicinidae is a family of small tropical land snails which have an operculum. They are terrestrial operculate gastropod mollusks in the superfamily Helicinoidea....
- † Family DawsonellidaeDawsonellidaeDawsonellidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks....
- † Family DeaniridaeDeaniridaeDeaniridae is an extinct taxonomic family of fossil sea snails, marine gastropod mollusks....
- Family NeritiliidaeNeritiliidaeNeritiliidae is a family of submarine cave snails, marine gastropod mollusks or micromollusks in the clade Cycloneritimorpha...
- Family ProserpinellidaeProserpinellidaeProserpinellidae is a family of snails, gastropods in the clade Cycloneritimorpha .This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005....
- Family ProserpinidaeProserpinidaeProserpinidae is a family of gastropods in the clade Cycloneritimorpha .This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005.- Genera :...
- Family Helicinidae
- Superfamily Hydrocenoidea
- Family HydrocenidaeHydrocenidaeHydrocenidae is a poorly-known taxonomic family of minute land snails or cave snails with an operculum, terrestrial gastropod mollusks or micromollusks in the clade Cycloneritimorpha....
- Family Hydrocenidae
- Superfamily NeritoideaNeritoideaNeritoidea is a taxonomic superfamily of mostly sea snails, nerites and their allies, marine gastropod mollusks in the clade Cycloneritimorpha ....
- Family NeritidaeNeritidaeNeritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum, marine, brackish water and freshwater gastropod mollusks in the order Neritoida....
- Family PhenacolepadidaePhenacolepadidaePhenacolepadidae is a family of small sea snails or false limpets, marine gastropod mollusks in the clade Cycloneritimorpha ....
- † Family PileolidaePileolidaePileolidae is an extinct family of sea snails, marine gastropod mollusks. This family is related to the extant family Neritidae, the nerites.The family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005....
- Family Neritidae
- Superfamily NeritopsoideaNeritopsoideaNeritopsoidea is a taxonomic grouping, a superfamily of sea snails, marine gastropod mollusks in the clade Cycloneritimorpha within clade Neritimorpha or in the order Neritoina within superorder Cycloneritimorpha within subclass Neritimorpha .- 1997 taxonomy :Neritopsoidea was in order Neritoida,...
- Family NeritopsidaeNeritopsidaeNeritopsidae is a family of small sea snails and freshwater snails in the clade Cycloneritimorpha ....
- † Family CortinellidaeCortinellidaeCortinellidae is an extinct taxonomic family of fossil sea snails....
- † Family DelphinulopsidaeDelphinulopsidaeDelphinulopsidae is an extinct taxonomic family of fossil sea snails, marine, gastropod mollusks.- Taxonomy :According to taxonomy of the Gastropoda by Bouchet & Rocroi the family Delphinulopsidae has no subfamilies.- 2007 taxonomy :...
- † Family PlagiothyridaePlagiothyridaePlagiothyridae is an extinct family of sea snails....
- † Family PseudorthonychiidaePseudorthonychiidaePseudorthonychiidae is an extinct, monogeneric family of gastropods in the clade Cycloneritimorpha ....
- Family Titiscaniidae
- Family Neritopsidae
- Superfamily SymmetrocapuloideaSymmetrocapuloideaSymmetrocapulidae is a taxonomic family of fossil snails, gastropod mollusks in the monotypic superfamily Symmetrocapuloidea in the clade Cycloneritimorpha.This superfamily is extinct. It has one family and no subfamilies....
- † Family Symmetrocapulidae