Evolution & Systematics

Gastropods arose from when a monoplacophoran ancestor underwent torsion, which is a 180° twist of the visceral mass. The characteristic of this taxon is that all gastropods exhibit torsion in some degree. (Ruppert et al. 2004) The species classification of M.marginalba is as follows:

Kingdom  ANIMALIA
Phylum  MOLLUSCA
Class  GASTROPODA
Suprageneric  ORTHOGASTROPODA
Subclass CAENOGASTROPODA
Suprageneric  SORBEOCONCHA
order HYPSOGASTROPODA
suborder NEOGASTROPODA
superfamily MURICOIDEA
family MURICIDAE
subfamily RAPANINAE
genus Morula 
subgenus  Morula (Morula)
species Morula (Morula) marginalba
(Atlas of Living Australia 2014)