Edward Hitchcock (1865) erected the ichnogenus Lunula with a single ichnospecies, L. obscura, for trackways (Fig. 1) that were discovered in the Lower Jurassic Turners Falls Formation of the Deerfield Basin in Massachusetts. As noted by Häntzschel (1965), however, and reiterated by Anderson (1981) later, Hitchcock’s application of that genus name to a trace fossil established an invalid junior homonym because Koenig (1825) had previously used Lunula for a bryozoan. The junior homonym must be replaced under Article 60 of the International Code of Zoological Nomenclature (ICZN, 1999...

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