Phylum Mollusca Linnaeus, 1758 - molluscs
Count: [*†*] 8c;49o;641f;6099g; †2f;162g [24 Jan 2022]
   Class Gastropoda Cuvier, 1795 - snails and slugs
  Count: [*] 21o;416f;4650g; †136g [13 Dec 2021]
     Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
    Count: [*] 8o;119f;463g [31 Oct 2021]
       Order Notaspidea Fischer, 1883 [monotypic] see Suborder Notaspidea Fischer, 1883
      Count: [*] 3f;13g [24 Oct 2021]
         Superfamily Pleurobranchoidea Gray, 1827
        Count: [*] 3f;13g [24 Oct 2021]
           Family Umbraculidae Dall, 1889 (1827)
          Count: [*] 2g [23 Oct 2021]
             1 Genus Umbraculum Schumacher, 1817
            Count: -
             2 Genus Spiricella Rang, 1828
            Count: -