Jacinthinus, Genus – synonym of Calliostoma, Genus
Janacus, Genus – synonym of Crepidula, Genus
Janera, Genus – synonym of Pecten, Genus
Janira, Genus – synonym of Pecten, Genus
Janolidae, Familia – synonym of Zephyrinidae, Familia
Janus, Genus – synonym of Janolus, Genus
Jaworskia, Genus – synonym of Pecten, Genus
Jeffreysia, Genus – synonym of Rissoella, Genus
Jeffreysiidae, Familia – synonym of Rissoellidae, Familia
Jeffreysina, Genus – synonym of Rissoella, Genus
Jeffreysiopsis, Genus – synonym of Rissoella, Genus
Jeffreysomya, Genus – synonym of Cuspidaria, Genus
Jenacus, Genus – synonym of Crepidula, Genus
Jordaniella, Genus – synonym of Chrysallida, Genus
Jordanula, Genus – synonym of Chrysallida, Genus
Juanella, Genus – synonym of Cadlina, Genus
Jumala, Genus – synonym of Beringius, Genus
Jupiteria, Genus – synonym of Nuculana, Genus