Classification
Animalia [kingdom]Mollusca [phylum]
Gastropoda [class]
Opisthobranchia [subclass]
Cephalaspidea [order]
Retusidae [family]
Retusa [genus]
Genus Retusa bevat de volgende taxa:
Retusa obtusa [species]
Retusa truncatula [species]
Retusa umbilicata [species]