How to render species comparable taxonomic units through deep time: A case study on intraspecific osteological variability in extant and extinct Lacertid lizards

Emanuel Tschopp, James Napoli, Lukardis Wencker, Massimo Delfino & Paul Upchurch
Generally, the species is considered to be the only naturally occurring taxon. However, species recognised and defined using different species delimitation criteria cannot readily be compared, impacting studies of biodiversity through Deep Time. This comparability issue is particularly marked when comparing extant with extinct species, because the only available data for species delimitation in fossils is derived from their preserved morphology, which is generally restricted to osteology in vertebrates. Here, we quantify intraspecific, intrageneric, and...
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