{"thcode":2,"term":{"code":1056,"name":"shellfish","parent":841,"scope":"Aquatic invertebrates with shells, usually mollusks and crustaceans. Includes clams, lobsters, and oysters."},"uf":[],"bt":[{"code":841,"name":"organism groupings (non-taxonomic)","parent":1174,"scope":"Used for categories of living organisms that are not taxonomic and that include species from more than one taxonomic group."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":53,"name":"aquatic biology","parent":650,"scope":"The scientific study of organisms living in or near water.  This term is to be used for the science of 'aquatic biology' and for  biological studies in fresh and brackish water. For marine biological studies, use 'marine biology'."},{"code":220,"name":"crustaceans","parent":58,"scope":"Arthropods of class Crustacea, such as crabs, lobsters, shrimp, prawns, or barnacles, with hard shells (exoskeleton) and segmented bodies with pairs of jointed appendages."},{"code":605,"name":"invertebrate zoology","parent":1339,"scope":"Branch of biology dealing with animals having no backbones or spinal columns."},{"code":757,"name":"mollusks","parent":606,"scope":"Invertebrates belonging to the phylum Mollusca with soft, nonsegmented bodies, often covered by a hard shell.  Includes snails, clams, oysters, whelks, mussels, slugs, octopuses, and squids."}]}