context source (MSBIAS)MEDIN. (2011). UK checklist of marine species derived from the applications Marine Recorder and UNICORN. version 1.0.[details]
basis of recordVaught, K.C.; Tucker Abbott, R.; Boss, K.J. (1989). A classification of the living Mollusca. American Malacologists: Melbourne. ISBN 0-915826-22-4. XII, 195 pp. (look up in IMIS) [details] Available for editors
additional sourceAn outline for the classification of Phylum Mollusca in taxonomic databases
[report elaborated by WoRMS editors for internal use, june 2010][details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Classification The classification of the Gastropoda in three subclasses Prosobranchia, Opisthobranchia and Pulmonata had been set as a standard by Thiele (1929-1931) throughout the XXth century and is still presented in major textbooks (e.g. Brusca & Brusca, 2003).
Nowadays the classification of Gastropoda undergoes considerable reorganization in the attempt to bring it as close as possible to a changing phylogenetic hypothesis of the class. There is compelling evidence that Prosobranchia as classically understood is a paraphyletic taxon, and as a consequence it is being progressively abandoned. Even if one would adopt the standards of Evolutionary Systematics and tolerate paraphyletic taxa under some conditions, it would be embarrassing to maintain Prosobranchia at the same taxonomic rank as Opisthobranchia and Pulmonata, which together form a clade (Heterobranchia) which is at large the sister-group of Caenogastropoda (i.e. part of Prosobranchia).
Following essentially Bouchet & Rocroi (2005, and references therein), the former Prosobranchia are here distributed in separate subclasses (Patellogastropoda, Vetigastropoda, Cocculiniformia, Neritimorpha, and Caenogastropoda) which are all supposed to be monophyletic. [details]