Palaeos		Gastropoda
Mollusca		References

Gastropoda: References

MOLLUSCA
|--ACULIFERA
`--CONCHIFERA
   `==Helcionelloida
      `--+--Bellerophontoidea
         `--GASTROPODA  (crown group)  
            |==Eogastropoda  (paraphyletic or polyphyletic) 
            |  |?--Macluritoidea
            |  |?--Euomphaloidea
            |  `--Patellogastropoda
            `--Orthogastropoda  
               |--Vetigastropoda
               |--Neritimorpha
               `--+--Caenogastropoda
                  `--Heterobranchia
                     |--Opisthobranchia
                     `--Pulmonata

Frýda, J. Racheboeuf, P.R., Frýdová, B., Ferrová, L., Mergl, M., Berkyová, S. 2009. Platyceratid gastropods – stem group of patellogastropods, neritimorphs or something else? Bulletin of Geosciences 84(1), 107–120 (5 figures). Czech Geological Survey, Prague. ISSN 1214-1119 pdf

Alexander Nützel 2002, An Evaluation of the Recently Proposed Palaeozoic Gastropod Subclass Euomphalomorpha, Palaeontology Volume 45, Issue 2, pages 259–266, March 2002 pdf

Peter J. Wagner, Phylogenetic Relationships of the Earliest Anisostrophically Coiled Gastropods pdf