{"thcode":2,"term":{"code":138,"name":"calcareous nannoplankton","parent":29,"scope":"Organisms of the kingdom Protista that normally produce coccoliths, microscopic structures of calcite (calcium carbonate), during some phase of their life cycle."},"uf":[{"name":"coccoliths","usewith":false}],"bt":[{"code":29,"name":"algae","parent":843,"scope":"Chlorophyll-bearing primarily aquatic nonvascular species that have no true roots, stems, or leaves; most algae are microscopic, but some species can be as large as vascular plants."},{"code":843,"name":"organisms","parent":1174,"scope":"Living individuals that grow, reproduce, and die."},{"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":738,"name":"micropaleontology","parent":861,"scope":"Branch of paleontology dealing with fossils too small to be seen without a microscope."},{"code":890,"name":"phycology","parent":127,"scope":"Branch of biology concerned with the study of algae."},{"code":1372,"name":"phytoplankton","parent":903,"scope":"Small, mostly microscopic aquatic plants such as algae and bacteria suspended in water."},{"code":903,"name":"plankton","parent":841,"scope":"Floating aquatic plants (phytoplankton) and animals (zooplankton) which are often microscopic and drift with the current in lakes, rivers, and oceans."}]}