An ichnotaxon (plural ichnotaxa) is defined by the International Code of Zoological Nomenclature as "a taxon based on the fossilized work of an organism". Ichnotaxa are names used to identify and distinguish morphologically distinctive trace fossils. They are assigned genus and species ranks by ichnologists, much like organisms in Linnaean taxonomy. These are known as ichnogenera and ichnospecies, respectively.
Ichnotaxa include trace fossils such as burrows, borings and etchings, tracks and trackways, coprolites, gastroliths, regurgitaliths, nests, leaf mines, bite and gnaw structures, secretions modified by organismal activity, such as cocoons, pupal cases, spider webs, embedment structures and plant galls.
Ichnotaxa comes from the Greek ichnos meaning track and taxis meaning ordering.