Basommatophora

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Basommatophora
Temporal range: Carboniferous–recent
The larger of the two basommatophoran snails shown here is Lymnaea stagnalis
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Informal group: Pulmonata
Informal group: Basommatophora
Keferstein in Bronn, 1864
Families

See text

Diversity[1]
about 300 species

Basommatophora was a term that was previously used as a

polyphyletic
, the term "group" or "informal group" was used.

Basommatophora are known from the Carboniferous to the Recent periods.[2]

Most of the families in this suborder are air-breathing freshwater snails. The three most abundant families in terms of number of species are, the Lymnaeidae (pond snails), the Planorbidae (ramshorn snails) and the Physidae (pouch or bubble snails). These are found in ponds, creeks, ditches, and shallow lakes nearly worldwide.

The

Latiidae
are limpet-like and confined to New Zealand.

Basommatophorans are characterized by having their eyes located at the base of their non-retractile tentacles, rather than at the tips, as in the true land snails Stylommatophora. The majority of basommatophorans have shells that are thin, translucent, and relatively colorless, and all except Amphibola lack an operculum.

Taxonomy

1997 taxonomy

In the older taxonomy of the Gastropoda (Ponder & Lindberg, 1997) the suborder Basommatophora consisted of the families :

2005 taxonomy

The informal group Basommatophora contains the following superfamilies and the

):

Clade
Hygrophila
  • Superfamily Chilinoidea Dall, 1870
    • Family
      Chilinidae
      Dall, 1870
    • Family
      Latiidae
      Hutton, 1882
  • Superfamily
    Acroloxoidea
    Thiele, 1931
  • Superfamily Lymnaeoidea Rafinesque, 1815
  • Superfamily
    Planorboidea
    Rafinesque, 1815

The family

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

Rafinesque
, 1815.

2010 taxonomy

More recently, the Basommatophora was found to be

Hygrophila) into a new taxon, Panpulmonata.[3]

References