mollusk family vs family Littorinidae

Other hyponyms of mollusk family include family Haliotidae, Haliotidae, family Strombidae, Strombidae, family Helicidae, Helicidae, family Limacidae, Limacidae, family Neritidae, Neritidae, Buccinidae, family Buccinidae, Cymatiidae, family Cymatiidae, family Naticidae, Naticidae, Littorinidae, family Patellidae, Patellidae, family Fissurellidae, Fissurellidae, Ancylidae, family Ancylidae, Aplysiidae, family Aplysiidae, family Tethyidae, Tethyidae, Akeridae, family Akeridae, family Physidae, Physidae, Cypraeidae, family Cypraeidae, family Myacidae, Myacidae, family Veneridae, Veneridae, family Solenidae, Solenidae, family Tridacnidae, Tridacnidae, Cardiidae, family Cardiidae, family Ostreidae, Ostreidae, family Pteriidae, Pteriidae, Anomiidae, family Anomiidae, Arcidae, family Arcidae, family Mytilidae, Mytilidae, family Unionidae, Unionidae, family Pectinidae, Pectinidae, family Teredinidae, Teredinidae, family Pholadidae, Pholadidae, family Nautilidae, Nautilidae, family Octopodidae, Octopodidae, Argonautidae, family Argonautidae, family Sepiidae, Sepiidae, family Spirulidae, Spirulidae, Belemnitidae, family Belemnitidae.