Living or extinct separates a taxon's surviving members from those known only from fossils. Wikipedia notes "the 41 officially recognized extant Felidae species" live today, while the "saber-toothed cats" of the extinct subfamily Machairodontinae, including the famous saber-toothed tiger, do not. This dimension lets a visitor tell a still-living branch of a family tree from an extinct one.
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1. Wikipedia: Taxonomic rank
WikipediaTaxonomic rank, Fundamental ranks section, rank sequence sentence, incertae sedis genus-rank residualQuote, Taxonomic rank, Fundamental ranks section, rank sequence sentence, incertae sedis genus-rank residual
kingdom, phylum or division, class, order, family, genus, and species
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