There is certainly little discussion of distinctive features that warrant the establishment of new ichnospecies. In short, the ichnospecies labels are something of a compromise. By this we mean that the use of familiar ichnogenera (Grallator, Eubrontes, and Batrachopus) acknowledges similarity, whereas the use of new ichnospecies names conveys the suggestion that the track assemblages are distinct in some way.
Source: wiktionary