Aplacophora is a class of small, deep-water, bottom dwelling, shell-less marine mollusks found in all oceans of the world. The class comprises 28 families and about 320 species. Aplacophorans are mostly less than 5 centimetres long, cylindrical and worm-like.
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- The Taxonomy of the Aplacophora Information on these deep-sea mollusks and their anatomy, with photographs of several species.
- Class Aplacophora Information from the Animal Diversity Web on these molluscs, their habitat, systematic and taxonomic history, physical description, reproduction and behavior.