mollusk genus vs Arca

Other hyponyms of mollusk genus include genus Haliotis, Haliotis, genus Lambis, Lambis, genus Strombus, Strombus, genus Helix, Helix, genus Limax, Limax, genus Nerita, genus Neritina, genus Littorina, Littorina, genus Patella, Patella, Fissurella, genus Fissurella, Ancylus, genus Ancylus, Aplysia, genus Aplysia, genus Tethus, Tethys, genus Hermissenda, Hermissenda, genus Haminoea, Haminoea, genus Physa, Cypraea, genus Cypraea, genus Chiton, genus Mya, Mya, genus Venus, Venus, genus Mercenaria, Mercenaria, Ensis, genus Ensis, genus Tridacna, Tridacna, Cardium, genus Cardium, genus Ostrea, Ostrea, Crassostrea, genus Crassostrea, genus Pinctada, Pinctada, Anomia, genus Anomia, genus Placuna, Placuna, genus Arca, genus Mytilus, Mytilus, genus Unio, Unio, Anodonta, genus Anodonta, Dreissena, genus Dreissena, genus Pecten, genus Teredo, Bankia, genus Bankia, genus Pholas, Pholas, genus Nautilus, genus Octopus, Argonauta, genus Argonauta, genus Loligo, genus Ommastrephes, genus Sepia, Sepia, genus Spirula.