basis of record
Vaught, K.C.; Abbott, R.T.; 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 
[request]
additional source
An outline for the classification of Phylum Mollusca in taxonomic databases
[report elaborated by WoRMS editors for internal use, june 2010] [details] 
From editor or global species database
Classification Originally established as an order of Basommatophora containing the families Ellobiidae, Otinidae, Chilinidae, Latiidae, Amphibolidae, Gadiniidae, and Siphonariidae.
Here omitted due to controversy regarding the phylogeny of these groups. [details]
