Class Vermes Linnaeus, 1758 - worms see Phylum Vermes (C. Linnaeus, 1758)
   Order Mollusca Linnaeus, 1758 see Phylum Mollusca Linnaeus, 1758
     282 Genus Limax Linnaeus, 1758
     283 Genus Laplysia Linnaeus, 1767, orth. inval. see Genus Aplysia Linnaeus, 1767
     283.0 Genus Aplysia Linnaeus, 1767 - seahare
     284 Genus Doris Linnaeus, 1758
     285 Genus Aphrodita Linnaeus, 1758
     286 Genus Nereis Linnaeus, 1758
     287 Genus Ascidia Linnaeus, 1767 - ascidia
     288 Genus Actinia Linnaeus, 1767 - sea anemone
     289 Genus Tethys Linnaeus, 1767, nom. cons.
     289.0 Genus Tethis Linnaeus, 1767, orth. inval. see Genus Tethys Linnaeus, 1767, nom. cons.
     290 Genus Holothuria Linnaeus, 1758, nom. rej. see Genus Physalia Lamarck, 1801
     291 Genus Terebella Linnaeus, 1767
     292 Genus Triton Linnaeus, 1758
     293 Genus Lernaea Linnaeus, 1758
     294 Genus Scyllaea Linnaeus, 1758
     295 Genus Clio Linnaeus, 1767
     296 Genus Sepia Linnaeus, 1758
     297 Genus Medusa Linnaeus, 1758
     298 Genus Asterias Linnaeus, 1758
     298.0 Genus Asteria Linnaeus, 1767 see Genus Asterias Linnaeus, 1758
     299("399") Genus Echinus Linnaeus, 1758