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An ichnotaxon (plural ichnotaxa) is "a taxon based on the fossilized work of an organism", i.e. the non-human equivalent of an artifact. Ichnotaxon comes from the Ancient Greek ( íchnos) meaning "track" and English , itself derived from Ancient Greek ( táxis) meaning "ordering".Definition of 'ichno' at dictionary.com.
Ichnotaxa are names used to identify and distinguish morphologically distinctive trace fossil, more commonly known as (fossil records of ' movement, rather than of the lifeforms themselves). They are assigned genus and species ranks by , much like organisms in Linnaean taxonomy. These are known as ichnogenera and ichnospecies, respectively. "Ichnogenus" and "ichnospecies" are commonly abbreviated as "igen." and "isp.". The binomial names of ichnospecies and their genera are to be written in italics.
Most researchers classify trace fossils only as far as the ichnogenus rank, based upon trace fossils that resemble each other in morphology but have subtle differences. Some authors have constructed detailed hierarchies up to ichnosuperclass, recognizing such fine detail as to identify ichnosuperorder and ichnoinfraclass, but such attempts are controversial.
Edward Hitchcock was the first to use the now common -ichnus suffix in 1858, with Cochlichnus.
The first edition of the International Code of Zoological Nomenclature, published in 1961, ruled that names of taxa published after 1930 should be 'accompanied by a statement that purports to give characters differentiating the taxon'. This had the effect that names for most ichnofossil taxa published after 1930 were unavailable name under the code. This restriction was removed for ichnotaxa in the third edition of the code, published in 1985. (1994). 9780471948438, John Wiley & Sons. ISBN 9780471948438
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