NZ Mollusca

Phylum and Class Index

Other non-Molluscan Phyla (Echinodermata, Brachiopoda etc) are being added to the checklist and photo sections of the website. This is to help identify species that may be mistaken for Mollusca, but actually are not.



  • Phylum:

    Mollusca
  • MonoplacophoraMonoplacophora
    Deep-water, limpet-like molluscs. Exclusively marine.
  • PolyplacophoraPolyplacophora
    Chitons. 8 plaits or valves, embedded in surrounding girdle.
  • GastropodaGastropoda
    Snails, slugs and nudibranchs. Marine, land and freshwater.
  • ScaphopodaScaphopoda
    Tusk Shells. Exclusively marine.
  • BivalviaBivalvia
    Clams, Mussels, Oysters, Pipi. Marine and freshwater.
  • CephalopodaCephalopoda
    Octopus, Squid, Nautilus. Exclusively marine.


  • Phylum:

    Echinodermata
  • AsteroideaAsteroidea
    Starfish. Usually star-shaped with a central disc, 5 or more arms
  • OphiuroideaOphiuroidea
    Star-shaped with a distinct central disc, and usually five slender arms.
  • EchinoideaEchinoidea
    Sea Eggs, Kina and Sea Urchins belong to the group Echinoidea.


  • Phylum:

    Arthropoda
  • HexanaupliaHexanauplia
    Barnacles are Crustaceans, related to crabs and shrimps