Orthogastropoda Explained

Orthogastropoda was a major taxonomic grouping of snails and slugs, an extremely large subclass within the huge class Gastropoda according to the older taxonomy of the Gastropoda (Ponder & Lindberg, 1997).

This taxon is no longer used according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005.

Ponder and Lindberg (1997) in the book The Southern Synthesis, showed the Orthogastropoda as one of two subclasses of the Gastropoda, the other subclass being a very much smaller group called the Eogastropoda, which contained only 5 families of true limpets.

This subclass, Orthogastropoda, which one perhaps could call the true snails, was defined most concisely as all gastropods which were not members of Patellogastropoda, the true limpets.

The Orthogastropoda appeared to form a clade which was supported by unambiguous synapomorphies. These synapomorphies (a series of characteristics that appear in its members but not in the other forms it diverged from) were the identifying characteristics of the clade.

Some of the characteristics were:

Taxonomy

The following is based on the somewhat out-dated taxonomy of the Gastropoda (Ponder & Lindberg, 1997). For the most up-to-date system of gastropod taxonomy, please see Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005).

Superorder Cocculiniformia Haszprunar, 1987

Superorder incertae sedis (Hot Vent Taxa)

Superorder Vetigastropoda Salvini-Plawen, 1989 (limpets)

Superorder Neritaemorphi Koken, 1896

Superorder Caenogastropoda Cox, 1960

Superorder Heterobranchia J.E. Gray, 1840

References

  1. Web site: Order Sorbeoconcha Ponder and Lindberg 1997 (snail). Fossilworks.
  2. Web site: WoRMS taxon details. World Register of Marine Species.

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