Anadara
      Anadara transversa (Say, 1822) 
      - Transverse ark (non-native species)
Arca
      Arca tetragona Poli, 1795 
        - Four-sided ark-shell or Common noah's ark 
      Arca zebra (Swainson, 1833) 
        - Turkey Wing (non-native species)
Asperarca
    Asperarca nodulosa (O. F. Müller, 1776) - An Ark shell
Bathyarca
    Bathyarca pectunculoides (Scacchi, 1835) 
    - syn. Arca pectunculoides - Comb bathyark or Hebridean Ark
Arcida (Order) > Arcoidea (Superfamily) 
  > Noetiidae (Family)
Striarca
      Striarca lactea (Linnaeus, 1758) - Milky ark
Arcida (Order) > Arcoidea (Superfamily) 
    > Glycymerididae (Family)
Glycymeris
      Glycymeris glycymeris (Linnaeus, 1758) 
        - Dog cockle or Comb shell
---------------------------------------------------------------
Other members of the order Arcoida
    From the authors collection of foreign shells,
species not recorded in the United Kingdom.
Arcida (Order) > Arcoidea (Superfamily) 
> Arcidae (Family)
Anadara
      Anadara gibbosa (Reeve, 1844) - An Ark shell
    
Arca
      Arca imbricata Bruguière, 1789 
        - Mossy ark
Arcida (Order) > Arcoidea (Superfamily) 
> Noetiidae (Family)
Arcopsis
  Arcopsis adamsi (Dall, 1886) 
  - Adams' minature arK (Brazil)
Noetia
  Noetia ponderosa (Say, 1822) 
  - Ponderous ark (Florida, USA)
Arcida (Order) > Arcoidea (Superfamily) 
  > Glycymerididae (Family)
Glycymeris
  Glycymeris bimaculata (Poli, 1795) 
  - A Dog cockle (Italy)
  Glycymeris nummaria (Linnaeus, 1758)
  - A Dog cockle (Italy)