Ichthyological terms, not general ones.
Any member of the phylum Arthropoda, these being characterised by a (usually) chitinous exoskeleton and segmented body to which jointed appendages are attached in pairs. Arthropods include the insects, crustaceans, arachnids, myriapods, and extinct trilobites, and comprise the largest phylum in the animal kingdom.
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Nitrogen-containing polysaccharide which forms the principal constituent of arthropod exoskeletons and the cell walls in some fungi.
Any member of the predominantly aquatic arthropod grouping Crustacea which currently contains almost 70,000 recognised species, including all crabs, lobsters, crayfish, shrimp, krill and barnacles. It's difficult to define their characteristics since the group is of arguable hierarchical status, generally regarded to represent either a Phylum or Subphylum.
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