Basommatophora

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Basommatophora

The larger of the two basommatophoran snails shown here is Lymnaea stagnalis

Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Orthogastropoda
Superorder:	Heterobranchia
Order:	Pulmonata
Suborder:	Basommatophora Keferstein in Bronn, 1864

Families

See text.

Basommatophora is a taxonomic suborder of air-breathing water snails, pulmonate gastropods in the order Pulmonata.

Most of the families in this suborder are freshwater snails, but the Siphonariidae and the Trimusculidae are unusual in that they have secondarily returned to the sea, and are now marine gastropods. The single species in the family Amphibolidae is archaic and retains an operculum. It lives at such a high tidal level that it could perhaps be considered terrestrial.

[edit] Families

Acroloxidae Thiele, 1931
Amphibolidae J. E. Gray, 1840 - only one species Amphibola crenata
Ancylidae
Carychiidae Jeffreys, 1830
Chilinidae
Lancidae
Latiidae
Lymnaeidae Rafinesque, 1815
Otinidae H. Adams & A. Adams, 1855
Physidae Fitzinger, 1833
Planorbidae Rafinesque, 1815
Siphonariidae J. E. Gray, 1840
Trimusculidae Zilch, 1959

In the new taxonomy of Bouchet & Rocroi (2005) this suborder has been split into an informal group Basommatophora, a clade Hygrophila and a clade Eupulmonata

Informal group Basommatophora
- Superfamily Amphiboloidea Gray, 1840
  - Family Amphibolidae Gray, 1840
- Superfamily Siphonarioidea Gray, 1827
  - Family Siphonariidae Gray, 1827
  - †Family Acroreiidae Cossmann, 1893
Clade Hygrophila
- Superfamily Chilinoidea Dall, 1870
  - Family Chilinidae Dall, 1870
  - Family Latiidae Hutton, 1882
- Superfamily Acroloxoidea Thiele, 1930
  - Family Acroloxidae Thiele, 1931
- Superfamily Lymnaeoidea Rafinesque, 1815
  - Family Lymnaeidae Rafinesque, 1815
- Superfamily Planorboidea Rafinesque, 1815
  - Family Physidae Fitzinger, 1833
  - Family Planorbidae Rafinesque, 1815
Clade Eupulmonata
- Superfamily Trimusculoidea J.Q. Burch, 1945 (1840)
  - Family Trimusculidae J.Q. Burch, 1945 (1840)
- Superfamily Otinoidea H.Adams & A. Adams, 1855
  - Family Otinidae H.Adams & A.Adams, 1855
- Superfamily Ellobioidea L.Pfeiffer, 1854 (1822)
  - Family Ellobiidae L. Pfeiffer, 1854 (1822)

The family Ancylidae has been reduced in this taxonomy to the status of tribe Ancylini Rafiniesque, 1815 of the subfamily Planorbinae Rafinesque, 1815 of the family Planorbidae Rafinesque, 1815

The family Carychiidae has been reduced in this taxonomy to the status of subfamily Carychiinae Jeffreys, 1830 of the family Ellobiidae L. Pfeiffer, 1854 (1822)

The family Lancidae has been reduced in this taxonomy to the status of subfamily Lancinae Hannibal, 1814 of the family Lymnaeidae Rafinesque, 1815 .