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a subphylum of invertebrate animals of the phylum Mollusca.
Amphineura are the most primitive mollusks. In some the shell consists of eight overlapping articulated mobile plates on the animal’s back. Other Amphineura lack shells. Amphineura comprise two classes, the Loricata and the Aplacophora (Solenogastres).
Widely known chitons belong to the class Loricata. These are herbivorous marine forms that usually inhabit the coastal zone; they attach themselves tightly to rocks by the suction of their feet. Aplacophora include forms that live on the bottom of the sea and look like worms. Their organization is greatly simplified, and they live a predatory life. Their bodies are up to 30 cm long. The best known Amphineura are Neomenia and Chaetoderma. In the waters of the USSR, chitons are richly represented, but Solenogastres are not numerous.